Merge tag 'i2c-for-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c updates from Wolfram Sang:

- new drivers for HPE GXP and Loongson 2K/LS7A

- bigger refactorings for i801 and xiic

- gpio driver gained ACPI and SDA-write only support

- the core converted some OF helpers to fwnode helpers

- usual bunch of driver updates

* tag 'i2c-for-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (52 commits)
MAINTAINERS: Add HPE GXP I2C Support
i2c: Add GXP SoC I2C Controller
dt-bindings: i2c: Add hpe,gxp-i2c
i2c: xiic: Remove some dead code
i2c: xiic: Add SCL frequency configuration support
i2c: xiic: Update compatible with new IP version
dt-bindings: i2c: xiic: Add 'xlnx,axi-iic-2.1' to compatible
i2c: i801: Call i801_check_post() from i801_access()
i2c: i801: Call i801_check_pre() from i801_access()
i2c: i801: Centralize configuring block commands in i801_block_transaction
i2c: i801: Centralize configuring non-block commands in i801_simple_transaction
i2c: i801: Handle SMBAUXCTL_E32B in i801_block_transaction_by_block only
i2c: i801: Add i801_simple_transaction(), complementing i801_block_transaction()
Documentation: i2c: correct spelling
dt-bindings: i2c: i2c-st: convert to DT schema
i2c: i801: add helper i801_set_hstadd()
i2c: i801: make FEATURE_BLOCK_PROC dependent on FEATURE_BLOCK_BUFFER
i2c: i801: make FEATURE_HOST_NOTIFY dependent on FEATURE_IRQ
i2c: i801: improve interrupt handler
i2c: st: use pm_sleep_ptr to avoid ifdef CONFIG_PM_SLEEP
...

Documentation/devicetree/bindings/i2c/hpe,gxp-i2c.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/hpe,gxp-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: HPE GXP SoC I2C Controller
+
+maintainers:
+  - Nick Hawkins <[e-mail]>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    const: hpe,gxp-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clock-frequency:
+    default: 100000
+
+  hpe,sysreg:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the global status and enable interrupt registers shared
+      between each I2C engine controller instance. It enables the I2C
+      engine controller to act as both a master or slave by being able to
+      arm and respond to interrupts from its engine. Each bit in the
+      registers represent the respective bit position.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    i2c@2600 {
+        compatible = "hpe,gxp-i2c";
+        reg = <0x2500 0x70>;
+        interrupts = <9>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+        hpe,sysreg = <&sysreg_system_controller>;
+        clock-frequency = <10000>;
+
+        eeprom@50 {
+            compatible = "atmel,24c128";
+            reg = <0x50>;
+        };
+    };

Documentation/devicetree/bindings/i2c/i2c-gpio.yaml

···
       open drain.
     maxItems: 1
 
+  i2c-gpio,sda-output-only:
+    description: sda as output only
+    type: boolean
+
   i2c-gpio,scl-output-only:
     description: scl as output only
     type: boolean
···
     description: this means that something outside of our control has put the
       GPIO line used for SCL into open drain mode, and that something is not
       the GPIO chip. It is essentially an inconsistency flag.
+
+  i2c-gpio,sda-has-no-pullup:
+    type: boolean
+    description: sda is used in a non-compliant way and has no pull-up.
+      Therefore disable open-drain. This property is mutually-exclusive
+      with i2c-gpio,sda-open-drain.
+
+  i2c-gpio,scl-has-no-pullup:
+    type: boolean
+    description: scl is used in a non-compliant way and has no pull-up.
+      Therefore disable open-drain. This property is mutually-exclusive
+      with i2c-gpio,scl-open-drain.
+
+dependencies:
+  i2c-gpio,sda-has-no-pullup:
+    not:
+      required:
+        - i2c-gpio,sda-open-drain
+  i2c-gpio,scl-has-no-pullup:
+    not:
+      required:
+        - i2c-gpio,scl-open-drain
 
 required:
   - compatible

Documentation/devicetree/bindings/i2c/i2c-mt65xx.yaml

···
           - const: mediatek,mt6577-i2c
       - items:
           - enum:
+              - mediatek,mt8365-i2c
+          - const: mediatek,mt8168-i2c
+      - items:
+          - enum:
               - mediatek,mt8195-i2c
           - const: mediatek,mt8192-i2c
 

Documentation/devicetree/bindings/i2c/i2c-st.txt

···
-ST SSC binding, for I2C mode operation
-
-Required properties :
-- compatible : Must be "st,comms-ssc-i2c" or "st,comms-ssc4-i2c"
-- reg : Offset and length of the register set for the device
-- interrupts : the interrupt specifier
-- clock-names: Must contain "ssc".
-- clocks: Must contain an entry for each name in clock-names. See the common
-  clock bindings.
-- A pinctrl state named "default" must be defined to set pins in mode of
-  operation for I2C transfer.
-
-Optional properties :
-- clock-frequency : Desired I2C bus clock frequency in Hz. If not specified,
-  the default 100 kHz frequency will be used. As only Normal and Fast modes
-  are supported, possible values are 100000 and 400000.
-- st,i2c-min-scl-pulse-width-us : The minimum valid SCL pulse width that is
-  allowed through the deglitch circuit. In units of us.
-- st,i2c-min-sda-pulse-width-us : The minimum valid SDA pulse width that is
-  allowed through the deglitch circuit. In units of us.
-- A pinctrl state named "idle" could be defined to set pins in idle state
-  when I2C instance is not performing a transfer.
-- A pinctrl state named "sleep" could be defined to set pins in sleep state
-  when driver enters in suspend.
-
-
-
-Example :
-
-i2c0: i2c@fed40000 {
-	compatible	= "st,comms-ssc4-i2c";
-	reg		= <0xfed40000 0x110>;
-	interrupts	=  <GIC_SPI 187 IRQ_TYPE_LEVEL_HIGH>;
-	clocks		= <&clk_s_a0_ls CLK_ICN_REG>;
-	clock-names	= "ssc";
-	clock-frequency = <400000>;
-	pinctrl-names	= "default";
-	pinctrl-0	= <&pinctrl_i2c0_default>;
-	st,i2c-min-scl-pulse-width-us = <0>;
-	st,i2c-min-sda-pulse-width-us = <5>;
-};

Documentation/devicetree/bindings/i2c/loongson,ls2x-i2c.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/loongson,ls2x-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson LS2X I2C Controller
+
+maintainers:
+  - Binbin Zhou <[e-mail]>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - loongson,ls2k-i2c
+      - loongson,ls7a-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c0: i2c@1fe21000 {
+        compatible = "loongson,ls2k-i2c";
+        reg = <0x1fe21000 0x8>;
+        interrupt-parent = <&extioiic>;
+        interrupts = <22 IRQ_TYPE_LEVEL_LOW>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        eeprom@57 {
+            compatible = "atmel,24c16";
+            reg = <0x57>;
+            pagesize = <16>;
+        };
+    };

Documentation/devicetree/bindings/i2c/qcom,i2c-cci.yaml

···
 
 properties:
   compatible:
-    enum:
-      - qcom,msm8226-cci
-      - qcom,msm8916-cci
-      - qcom,msm8974-cci
-      - qcom,msm8996-cci
-      - qcom,sdm845-cci
-      - qcom,sm8250-cci
-      - qcom,sm8450-cci
+    oneOf:
+      - enum:
+          - qcom,msm8226-cci
+          - qcom,msm8974-cci
+          - qcom,msm8996-cci
+
+      - items:
+          - enum:
+              - qcom,msm8916-cci
+          - const: qcom,msm8226-cci # CCI v1
+
+      - items:
+          - enum:
+              - qcom,sdm845-cci
+              - qcom,sm6350-cci
+              - qcom,sm8250-cci
+              - qcom,sm8450-cci
+          - const: qcom,msm8996-cci # CCI v2
 
   "#address-cells":
     const: 1
···
   - if:
       properties:
         compatible:
-          contains:
-            enum:
-              - qcom,msm8226-cci
-              - qcom,msm8974-cci
+          oneOf:
+            - contains:
+                enum:
+                  - qcom,msm8974-cci
+
+            - const: qcom,msm8226-cci
     then:
       properties:
         clocks:
···
   - if:
       properties:
         compatible:
-          contains:
-            enum:
-              - qcom,msm8916-cci
-              - qcom,msm8996-cci
+          oneOf:
+            - contains:
+                enum:
+                  - qcom,msm8916-cci
+
+            - const: qcom,msm8996-cci
     then:
       properties:
         clocks:
···
           contains:
             enum:
               - qcom,sdm845-cci
+              - qcom,sm6350-cci
     then:
       properties:
         clocks:
···
 
     cci@ac4a000 {
         reg = <0x0ac4a000 0x4000>;
-        compatible = "qcom,sdm845-cci";
+        compatible = "qcom,sdm845-cci", "qcom,msm8996-cci";
         #address-cells = <1>;
         #size-cells = <0>;
 

Documentation/devicetree/bindings/i2c/socionext,uniphier-fi2c.yaml

···
     minimum: 100000
     maximum: 400000
 
+  resets:
+    maxItems: 1
+
 required:
   - compatible
   - reg

Documentation/devicetree/bindings/i2c/socionext,uniphier-i2c.yaml

···
     minimum: 100000
     maximum: 400000
 
+  resets:
+    maxItems: 1
+
 required:
   - compatible
   - reg

Documentation/devicetree/bindings/i2c/st,sti-i2c.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/st,sti-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: I2C controller embedded in STMicroelectronics STi platform
+
+maintainers:
+  - Patrice Chotard <[e-mail]>
+
+allOf:
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - st,comms-ssc-i2c
+      - st,comms-ssc4-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    maxItems: 1
+
+  clock-frequency:
+    enum: [ 100000, 400000 ]
+    default: 100000
+
+  st,i2c-min-scl-pulse-width-us:
+    description:
+      The minimum valid SCL pulse width that is allowed through the
+      deglitch circuit. In units of us.
+
+  st,i2c-min-sda-pulse-width-us:
+    description:
+      The minimum valid SDA pulse width that is allowed through the
+      deglitch circuit. In units of us.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/clock/stih407-clks.h>
+    i2c@fed40000 {
+        compatible = "st,comms-ssc4-i2c";
+        reg = <0xfed40000 0x110>;
+        interrupts =  <GIC_SPI 187 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk_s_a0_ls CLK_ICN_REG>;
+        clock-names = "ssc";
+        clock-frequency = <400000>;
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_i2c0_default>;
+        st,i2c-min-scl-pulse-width-us = <0>;
+        st,i2c-min-sda-pulse-width-us = <5>;
+    };

Documentation/devicetree/bindings/i2c/xlnx,xps-iic-2.00.a.yaml

···
 
 properties:
   compatible:
-    const: xlnx,xps-iic-2.00.a
+    enum:
+      - xlnx,axi-iic-2.1
+      - xlnx,xps-iic-2.00.a
 
   reg:
     maxItems: 1
···
     const: pclk
     description: |
       Input clock name.
+
+  clock-frequency:
+    description:
+      Optional I2C SCL clock frequency. If not specified, do not configure
+      in software, rely only on hardware design value.
+    default: 100000
+    enum: [ 100000, 400000, 1000000 ]
 
 required:
   - compatible

Documentation/i2c/gpio-fault-injection.rst

···
 ------------------
 
 This file is write only and you need to write the duration of the arbitration
-intereference (in µs, maximum is 100ms). The calling process will then sleep
+interference (in µs, maximum is 100ms). The calling process will then sleep
 and wait for the next bus clock. The process is interruptible, though.
 
 Arbitration lost is achieved by waiting for SCL going down by the master under

Documentation/i2c/smbus-protocol.rst

···
 * I2C bus drivers trigger SMBus Host Notify by a call to
   i2c_handle_smbus_host_notify().
 * I2C drivers for devices which can trigger SMBus Host Notify will have
-  client->irq assigned to a Host Notify IRQ if noone else specified an other.
+  client->irq assigned to a Host Notify IRQ if no one else specified another.
 
 There is currently no way to retrieve the data parameter from the client.
 

MAINTAINERS

···
 F:	Documentation/hwmon/gxp-fan-ctrl.rst
 F:	Documentation/devicetree/bindings/arm/hpe,gxp.yaml
 F:	Documentation/devicetree/bindings/hwmon/hpe,gxp-fan-ctrl.yaml
+F:	Documentation/devicetree/bindings/i2c/hpe,gxp-i2c.yaml
 F:	Documentation/devicetree/bindings/spi/hpe,gxp-spifi.yaml
 F:	Documentation/devicetree/bindings/timer/hpe,gxp-timer.yaml
 F:	arch/arm/boot/dts/hpe-bmc*
···
 F:	arch/arm/mach-hpe/
 F:	drivers/clocksource/timer-gxp.c
 F:	drivers/hwmon/gxp-fan-ctrl.c
+F:	drivers/i2c/busses/i2c-gxp.c
 F:	drivers/spi/spi-gxp.c
 F:	drivers/watchdog/gxp-wdt.c
 
···
 S:	Maintained
 W:	http://www.stlinux.com
 F:	Documentation/devicetree/bindings/spi/st,ssc-spi.yaml
-F:	Documentation/devicetree/bindings/i2c/i2c-st.txt
+F:	Documentation/devicetree/bindings/i2c/st,sti-i2c.yaml
 F:	arch/arm/boot/dts/sti*
 F:	arch/arm/mach-sti/
 F:	drivers/ata/ahci_st.c
···
 F:	drivers/*/*loongarch*
 F:	Documentation/loongarch/
 F:	Documentation/translations/zh_CN/loongarch/
+
+LOONGSON LS2X I2C DRIVER
+M:	Binbin Zhou <[e-mail]>
+L:	[e-mail]
+S:	Maintained
+F:	Documentation/devicetree/bindings/i2c/loongson,ls2x-i2c.yaml
+F:	drivers/i2c/busses/i2c-ls2x.c
 
 LOONGSON-2 SOC SERIES GUTS DRIVER
 M:	Yinbo Zhu <[e-mail]>

drivers/i2c/algos/i2c-algo-bit.c

···
 
 	/* read ack: SDA should be pulled down by slave, or it may
 	 * NAK (usually to report problems with the data we wrote).
+	 * Always report ACK if SDA is write-only.
 	 */
-	ack = !getsda(adap);    /* ack: sda is pulled low -> success */
+	ack = !adap->getsda || !getsda(adap);    /* ack: sda is pulled low -> success */
 	bit_dbg(2, &i2c_adap->dev, "i2c_outb: 0x%02x %s\n", (int)c,
 		ack ? "A" : "NA");
 
···
 			return -ENODEV;
 	}
 
+	if (adap->getsda == NULL)
+		pr_info("%s: SDA is write-only, testing not possible\n", name);
 	if (adap->getscl == NULL)
-		pr_info("%s: Testing SDA only, SCL is not readable\n", name);
+		pr_info("%s: SCL is write-only, testing not possible\n", name);
 
-	sda = getsda(adap);
-	scl = (adap->getscl == NULL) ? 1 : getscl(adap);
+	sda = adap->getsda ? getsda(adap) : 1;
+	scl = adap->getscl ? getscl(adap) : 1;
 	if (!scl || !sda) {
-		printk(KERN_WARNING
-		       "%s: bus seems to be busy (scl=%d, sda=%d)\n",
-		       name, scl, sda);
+		pr_warn("%s: bus seems to be busy (scl=%d, sda=%d)\n", name, scl, sda);
 		goto bailout;
 	}
 
 	sdalo(adap);
-	sda = getsda(adap);
-	scl = (adap->getscl == NULL) ? 1 : getscl(adap);
-	if (sda) {
-		printk(KERN_WARNING "%s: SDA stuck high!\n", name);
+	if (adap->getsda && getsda(adap)) {
+		pr_warn("%s: SDA stuck high!\n", name);
 		goto bailout;
 	}
-	if (!scl) {
-		printk(KERN_WARNING
-		       "%s: SCL unexpected low while pulling SDA low!\n",
-		       name);
+	if (adap->getscl && !getscl(adap)) {
+		pr_warn("%s: SCL unexpected low while pulling SDA low!\n", name);
 		goto bailout;
 	}
 
 	sdahi(adap);
-	sda = getsda(adap);
-	scl = (adap->getscl == NULL) ? 1 : getscl(adap);
-	if (!sda) {
-		printk(KERN_WARNING "%s: SDA stuck low!\n", name);
+	if (adap->getsda && !getsda(adap)) {
+		pr_warn("%s: SDA stuck low!\n", name);
 		goto bailout;
 	}
-	if (!scl) {
-		printk(KERN_WARNING
-		       "%s: SCL unexpected low while pulling SDA high!\n",
-		       name);
+	if (adap->getscl && !getscl(adap)) {
+		pr_warn("%s: SCL unexpected low while pulling SDA high!\n", name);
 		goto bailout;
 	}
 
 	scllo(adap);
-	sda = getsda(adap);
-	scl = (adap->getscl == NULL) ? 0 : getscl(adap);
-	if (scl) {
-		printk(KERN_WARNING "%s: SCL stuck high!\n", name);
+	if (adap->getscl && getscl(adap)) {
+		pr_warn("%s: SCL stuck high!\n", name);
 		goto bailout;
 	}
-	if (!sda) {
-		printk(KERN_WARNING
-		       "%s: SDA unexpected low while pulling SCL low!\n",
-		       name);
+	if (adap->getsda && !getsda(adap)) {
+		pr_warn("%s: SDA unexpected low while pulling SCL low!\n", name);
 		goto bailout;
 	}
 
 	sclhi(adap);
-	sda = getsda(adap);
-	scl = (adap->getscl == NULL) ? 1 : getscl(adap);
-	if (!scl) {
-		printk(KERN_WARNING "%s: SCL stuck low!\n", name);
+	if (adap->getscl && !getscl(adap)) {
+		pr_warn("%s: SCL stuck low!\n", name);
 		goto bailout;
 	}
-	if (!sda) {
-		printk(KERN_WARNING
-		       "%s: SDA unexpected low while pulling SCL high!\n",
-		       name);
+	if (adap->getsda && !getsda(adap)) {
+		pr_warn("%s: SDA unexpected low while pulling SCL high!\n", name);
 		goto bailout;
 	}
 
···
 	unsigned char *temp = msg->buf;
 	int count = msg->len;
 	const unsigned flags = msg->flags;
+	struct i2c_algo_bit_data *adap = i2c_adap->algo_data;
+
+	if (!adap->getsda)
+		return -EOPNOTSUPP;
 
 	while (count > 0) {
 		inval = i2c_inb(i2c_adap);
···
 	if (ret < 0)
 		return ret;
 
-	/* Complain if SCL can't be read */
-	if (bit_adap->getscl == NULL) {
+	if (bit_adap->getsda == NULL)
+		dev_warn(&adap->dev, "Not I2C compliant: can't read SDA\n");
+
+	if (bit_adap->getscl == NULL)
 		dev_warn(&adap->dev, "Not I2C compliant: can't read SCL\n");
+
+	if (bit_adap->getsda == NULL || bit_adap->getscl == NULL)
 		dev_warn(&adap->dev, "Bus may be unreliable\n");
-	}
+
 	return 0;
 }
 

drivers/i2c/busses/Kconfig

···
 	  faults to an I2C bus, so another bus master can be stress-tested.
 	  This is for debugging. If unsure, say 'no'.
 
+config I2C_GXP
+	tristate "GXP I2C Interface"
+	depends on ARCH_HPE_GXP || COMPILE_TEST
+	help
+	  This enables support for GXP I2C interface. The I2C engines can be
+	  either I2C master or I2C slaves.
+
 config I2C_HIGHLANDER
 	tristate "Highlander FPGA SMBus interface"
 	depends on SH_HIGHLANDER || COMPILE_TEST
···
 
 	  This driver can also be built as a module.  If so, the module
 	  will be called i2c-lpc2k.
+
+config I2C_LS2X
+	tristate "Loongson LS2X I2C adapter"
+	depends on MACH_LOONGSON64 || COMPILE_TEST
+	help
+	  If you say yes to this option, support will be included for the
+	  I2C interface on the Loongson-2K SoCs and Loongson LS7A bridge
+	  chip.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called i2c-ls2x.
 
 config I2C_MLXBF
         tristate "Mellanox BlueField I2C controller"

drivers/i2c/busses/Makefile

···
 obj-$(CONFIG_I2C_JZ4780)	+= i2c-jz4780.o
 obj-$(CONFIG_I2C_KEMPLD)	+= i2c-kempld.o
 obj-$(CONFIG_I2C_LPC2K)		+= i2c-lpc2k.o
+obj-$(CONFIG_I2C_LS2X)		+= i2c-ls2x.o
 obj-$(CONFIG_I2C_MESON)		+= i2c-meson.o
 obj-$(CONFIG_I2C_MICROCHIP_CORE)	+= i2c-microchip-corei2c.o
 obj-$(CONFIG_I2C_MPC)		+= i2c-mpc.o
···
 obj-$(CONFIG_I2C_XILINX)	+= i2c-xiic.o
 obj-$(CONFIG_I2C_XLP9XX)	+= i2c-xlp9xx.o
 obj-$(CONFIG_I2C_RCAR)		+= i2c-rcar.o
+obj-$(CONFIG_I2C_GXP)		+= i2c-gxp.o
 
 # External I2C/SMBus adapter drivers
 obj-$(CONFIG_I2C_DIOLAN_U2C)	+= i2c-diolan-u2c.o

drivers/i2c/busses/i2c-aspeed.c

···
 	const struct of_device_id *match;
 	struct aspeed_i2c_bus *bus;
 	struct clk *parent_clk;
-	struct resource *res;
 	int irq, ret;
 
 	bus = devm_kzalloc(&pdev->dev, sizeof(*bus), GFP_KERNEL);
 	if (!bus)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	bus->base = devm_ioremap_resource(&pdev->dev, res);
+	bus->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 	if (IS_ERR(bus->base))
 		return PTR_ERR(bus->base);
 

drivers/i2c/busses/i2c-au1550.c

···
 i2c_au1550_probe(struct platform_device *pdev)
 {
 	struct i2c_au1550_data *priv;
-	struct resource *r;
 	int ret;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(struct i2c_au1550_data),
···
 	if (!priv)
 		return -ENOMEM;
 
-	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	priv->psc_base = devm_ioremap_resource(&pdev->dev, r);
+	priv->psc_base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 	if (IS_ERR(priv->psc_base))
 		return PTR_ERR(priv->psc_base);
 

drivers/i2c/busses/i2c-bcm2835.c

···
 static int bcm2835_i2c_probe(struct platform_device *pdev)
 {
 	struct bcm2835_i2c_dev *i2c_dev;
-	struct resource *mem;
 	int ret;
 	struct i2c_adapter *adap;
 	struct clk *mclk;
···
 	i2c_dev->dev = &pdev->dev;
 	init_completion(&i2c_dev->completion);
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	i2c_dev->regs = devm_ioremap_resource(&pdev->dev, mem);
+	i2c_dev->regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 	if (IS_ERR(i2c_dev->regs))
 		return PTR_ERR(i2c_dev->regs);
 

drivers/i2c/busses/i2c-cadence.c

···
 #define CNDS_I2C_PM_TIMEOUT		1000	/* ms */
 
 #define CDNS_I2C_FIFO_DEPTH		16
-/* FIFO depth at which the DATA interrupt occurs */
-#define CDNS_I2C_DATA_INTR_DEPTH	(CDNS_I2C_FIFO_DEPTH - 2)
 #define CDNS_I2C_MAX_TRANSFER_SIZE	255
 /* Transfer size in multiples of data interrupt depth */
 #define CDNS_I2C_TRANSFER_SIZE	(CDNS_I2C_MAX_TRANSFER_SIZE - 3)
···
  * @send_count:		Number of bytes still expected to send
  * @recv_count:		Number of bytes still expected to receive
  * @curr_recv_count:	Number of bytes to be received in current transfer
- * @irq:		IRQ number
  * @input_clk:		Input clock to I2C controller
  * @i2c_clk:		Maximum I2C clock speed
  * @bus_hold_flag:	Flag used in repeated start for clearing HOLD bit
···
 	unsigned int send_count;
 	unsigned int recv_count;
 	unsigned int curr_recv_count;
-	int irq;
 	unsigned long input_clk;
 	unsigned int i2c_clk;
 	unsigned int bus_hold_flag;
···
 	}
 
 	/* Determine hold_clear based on number of bytes to receive and hold flag */
-	if (!id->bus_hold_flag &&
-	    ((id->p_msg->flags & I2C_M_RECV_LEN) != I2C_M_RECV_LEN) &&
-	    (id->recv_count <= CDNS_I2C_FIFO_DEPTH)) {
+	if (!id->bus_hold_flag && id->recv_count <= CDNS_I2C_FIFO_DEPTH) {
 		if (cdns_i2c_readreg(CDNS_I2C_CR_OFFSET) & CDNS_I2C_CR_HOLD) {
 			hold_clear = true;
 			if (id->quirks & CDNS_I2C_BROKEN_HOLD_BIT)
···
 {
 	struct resource *r_mem;
 	struct cdns_i2c *id;
-	int ret;
+	int ret, irq;
 	const struct of_device_id *match;
 
 	id = devm_kzalloc(&pdev->dev, sizeof(*id), GFP_KERNEL);
···
 	if (IS_ERR(id->membase))
 		return PTR_ERR(id->membase);
 
-	ret = platform_get_irq(pdev, 0);
-	if (ret < 0)
-		return ret;
-	id->irq = ret;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
 	id->adap.owner = THIS_MODULE;
 	id->adap.dev.of_node = pdev->dev.of_node;
···
 		goto err_clk_dis;
 	}
 
-	ret = devm_request_irq(&pdev->dev, id->irq, cdns_i2c_isr, 0,
+	ret = devm_request_irq(&pdev->dev, irq, cdns_i2c_isr, 0,
 				 DRIVER_NAME, id);
 	if (ret) {
-		dev_err(&pdev->dev, "cannot get irq %d\n", id->irq);
+		dev_err(&pdev->dev, "cannot get irq %d\n", irq);
 		goto err_clk_dis;
 	}
 	cdns_i2c_init(id);
···
 		goto err_clk_dis;
 
 	dev_info(&pdev->dev, "%u kHz mmio %08lx irq %d\n",
-		 id->i2c_clk / 1000, (unsigned long)r_mem->start, id->irq);
+		 id->i2c_clk / 1000, (unsigned long)r_mem->start, irq);
 
 	return 0;
 

drivers/i2c/busses/i2c-designware-common.c

···
 
 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev)
 {
-	u32 reg;
+	unsigned int reg;
 	int ret;
 
 	ret = i2c_dw_acquire_lock(dev);
···
 void __i2c_dw_disable(struct dw_i2c_dev *dev)
 {
 	int timeout = 100;
-	u32 status;
+	unsigned int status;
 
 	do {
 		__i2c_dw_disable_nowait(dev);
···
 	dev_warn(dev->dev, "timeout in disabling adapter\n");
 }
 
-unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev)
+u32 i2c_dw_clk_rate(struct dw_i2c_dev *dev)
 {
 	/*
 	 * Clock is not necessary if we got LCNT/HCNT values directly from
···
  */
 int i2c_dw_wait_bus_not_busy(struct dw_i2c_dev *dev)
 {
-	u32 status;
+	unsigned int status;
 	int ret;
 
 	ret = regmap_read_poll_timeout(dev->map, DW_IC_STATUS, status,
···
 
 int i2c_dw_set_fifo_size(struct dw_i2c_dev *dev)
 {
-	u32 param, tx_fifo_depth, rx_fifo_depth;
+	u32 tx_fifo_depth, rx_fifo_depth;
+	unsigned int param;
 	int ret;
 
 	/*
···
 
 void i2c_dw_disable(struct dw_i2c_dev *dev)
 {
-	u32 dummy;
+	unsigned int dummy;
 	int ret;
 
 	ret = i2c_dw_acquire_lock(dev);

drivers/i2c/busses/i2c-designware-core.h

···
 #define DW_IC_CON_STOP_DET_IFADDRESSED		BIT(7)
 #define DW_IC_CON_TX_EMPTY_CTRL			BIT(8)
 #define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL		BIT(9)
+#define DW_IC_CON_BUS_CLEAR_CTRL		BIT(11)
 
 #define DW_IC_DATA_CMD_DAT			GENMASK(7, 0)
 
···
 	u8			*rx_buf;
 	int			msg_err;
 	unsigned int		status;
-	u32			abort_source;
+	unsigned int		abort_source;
 	int			irq;
 	u32			flags;
 	struct i2c_adapter	adapter;
···
 u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset);
 u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset);
 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev);
-unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev);
+u32 i2c_dw_clk_rate(struct dw_i2c_dev *dev);
 int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare);
 int i2c_dw_acquire_lock(struct dw_i2c_dev *dev);
 void i2c_dw_release_lock(struct dw_i2c_dev *dev);

drivers/i2c/busses/i2c-designware-master.c

···
 
 static int i2c_dw_set_timings_master(struct dw_i2c_dev *dev)
 {
-	u32 comp_param1;
+	unsigned int comp_param1;
 	u32 sda_falling_time, scl_falling_time;
 	struct i2c_timings *t = &dev->timings;
 	const char *fp_str = "";
···
 {
 	struct i2c_msg *msgs = dev->msgs;
 	u32 ic_con = 0, ic_tar = 0;
-	u32 dummy;
+	unsigned int dummy;
 
 	/* Disable the adapter */
 	__i2c_dw_disable(dev);
···
 	int msg_wrt_idx, msg_itr_lmt, buf_len, data_idx;
 	int cmd = 0, status;
 	u8 *tx_buf;
-	u32 val;
+	unsigned int val;
 
 	/*
 	 * In order to enable the interrupt for UCSI i.e. AMD NAVI GPU card,
···
 	unsigned int rx_valid;
 
 	for (; dev->msg_read_idx < dev->msgs_num; dev->msg_read_idx++) {
-		u32 len, tmp;
+		unsigned int tmp;
+		u32 len;
 		u8 *buf;
 
 		if (!(msgs[dev->msg_read_idx].flags & I2C_M_RD))
···
 
 static u32 i2c_dw_read_clear_intrbits(struct dw_i2c_dev *dev)
 {
-	u32 stat, dummy;
+	unsigned int stat, dummy;
 
 	/*
 	 * The IC_INTR_STAT register just indicates "enabled" interrupts.
···
 static irqreturn_t i2c_dw_isr(int this_irq, void *dev_id)
 {
 	struct dw_i2c_dev *dev = dev_id;
-	u32 stat, enabled;
+	unsigned int stat, enabled;
 
 	regmap_read(dev->map, DW_IC_ENABLE, &enabled);
 	regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &stat);
···
 {
 	struct i2c_adapter *adap = &dev->adapter;
 	unsigned long irq_flags;
+	unsigned int ic_con;
 	int ret;
 
 	init_completion(&dev->cmd_complete);
···
 	ret = i2c_dw_set_fifo_size(dev);
 	if (ret)
 		return ret;
+
+	/* Lock the bus for accessing DW_IC_CON */
+	ret = i2c_dw_acquire_lock(dev);
+	if (ret)
+		return ret;
+
+	/*
+	 * On AMD platforms BIOS advertises the bus clear feature
+	 * and enables the SCL/SDA stuck low. SMU FW does the
+	 * bus recovery process. Driver should not ignore this BIOS
+	 * advertisement of bus clear feature.
+	 */
+	ret = regmap_read(dev->map, DW_IC_CON, &ic_con);
+	i2c_dw_release_lock(dev);
+	if (ret)
+		return ret;
+
+	if (ic_con & DW_IC_CON_BUS_CLEAR_CTRL)
+		dev->master_cfg |= DW_IC_CON_BUS_CLEAR_CTRL;
 
 	ret = dev->init(dev);
 	if (ret)

drivers/i2c/busses/i2c-designware-slave.c

···
 
 static u32 i2c_dw_read_clear_intrbits_slave(struct dw_i2c_dev *dev)
 {
-	u32 stat, dummy;
+	unsigned int stat, dummy;
 
 	/*
 	 * The IC_INTR_STAT register just indicates "enabled" interrupts.
···
 static irqreturn_t i2c_dw_isr_slave(int this_irq, void *dev_id)
 {
 	struct dw_i2c_dev *dev = dev_id;
-	u32 raw_stat, stat, enabled, tmp;
+	unsigned int raw_stat, stat, enabled, tmp;
 	u8 val = 0, slave_activity;
 
 	regmap_read(dev->map, DW_IC_ENABLE, &enabled);

drivers/i2c/busses/i2c-gpio.c

···
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
-#include <linux/of.h>
 #include <linux/platform_data/i2c-gpio.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 
 struct i2c_gpio_private_data {
···
 static inline void i2c_gpio_fault_injector_exit(struct platform_device *pdev) {}
 #endif /* CONFIG_I2C_GPIO_FAULT_INJECTOR*/
 
-static void of_i2c_gpio_get_props(struct device_node *np,
-				  struct i2c_gpio_platform_data *pdata)
+/* Get i2c-gpio properties from DT or ACPI table */
+static void i2c_gpio_get_properties(struct device *dev,
+				    struct i2c_gpio_platform_data *pdata)
 {
 	u32 reg;
 
-	of_property_read_u32(np, "i2c-gpio,delay-us", &pdata->udelay);
+	device_property_read_u32(dev, "i2c-gpio,delay-us", &pdata->udelay);
 
-	if (!of_property_read_u32(np, "i2c-gpio,timeout-ms", &reg))
+	if (!device_property_read_u32(dev, "i2c-gpio,timeout-ms", &reg))
 		pdata->timeout = msecs_to_jiffies(reg);
 
 	pdata->sda_is_open_drain =
-		of_property_read_bool(np, "i2c-gpio,sda-open-drain");
+		device_property_read_bool(dev, "i2c-gpio,sda-open-drain");
 	pdata->scl_is_open_drain =
-		of_property_read_bool(np, "i2c-gpio,scl-open-drain");
+		device_property_read_bool(dev, "i2c-gpio,scl-open-drain");
 	pdata->scl_is_output_only =
-		of_property_read_bool(np, "i2c-gpio,scl-output-only");
+		device_property_read_bool(dev, "i2c-gpio,scl-output-only");
+	pdata->sda_is_output_only =
+		device_property_read_bool(dev, "i2c-gpio,sda-output-only");
+	pdata->sda_has_no_pullup =
+		device_property_read_bool(dev, "i2c-gpio,sda-has-no-pullup");
+	pdata->scl_has_no_pullup =
+		device_property_read_bool(dev, "i2c-gpio,scl-has-no-pullup");
 }
 
 static struct gpio_desc *i2c_gpio_get_desc(struct device *dev,
···
 	struct i2c_algo_bit_data *bit_data;
 	struct i2c_adapter *adap;
 	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
+	struct fwnode_handle *fwnode = dev_fwnode(dev);
 	enum gpiod_flags gflags;
 	int ret;
 
···
 	bit_data = &priv->bit_data;
 	pdata = &priv->pdata;
 
-	if (np) {
-		of_i2c_gpio_get_props(np, pdata);
+	if (fwnode) {
+		i2c_gpio_get_properties(dev, pdata);
 	} else {
 		/*
 		 * If all platform data settings are zero it is OK
···
 	 * handle them as we handle any other output. Else we enforce open
 	 * drain as this is required for an I2C bus.
 	 */
-	if (pdata->sda_is_open_drain)
+	if (pdata->sda_is_open_drain || pdata->sda_has_no_pullup)
 		gflags = GPIOD_OUT_HIGH;
 	else
 		gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
···
 	if (IS_ERR(priv->sda))
 		return PTR_ERR(priv->sda);
 
-	if (pdata->scl_is_open_drain)
+	if (pdata->scl_is_open_drain || pdata->scl_has_no_pullup)
 		gflags = GPIOD_OUT_HIGH;
 	else
 		gflags = GPIOD_OUT_HIGH_OPEN_DRAIN;
···
 
 	if (!pdata->scl_is_output_only)
 		bit_data->getscl = i2c_gpio_getscl;
-	bit_data->getsda = i2c_gpio_getsda;
+	if (!pdata->sda_is_output_only)
+		bit_data->getsda = i2c_gpio_getsda;
 
 	if (pdata->udelay)
 		bit_data->udelay = pdata->udelay;
···
 	bit_data->data = priv;
 
 	adap->owner = THIS_MODULE;
-	if (np)
+	if (fwnode)
 		strscpy(adap->name, dev_name(dev), sizeof(adap->name));
 	else
 		snprintf(adap->name, sizeof(adap->name), "i2c-gpio%d", pdev->id);
···
 	adap->algo_data = bit_data;
 	adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
 	adap->dev.parent = dev;
-	adap->dev.of_node = np;
+	device_set_node(&adap->dev, fwnode);
 
 	adap->nr = pdev->id;
 	ret = i2c_bit_add_numbered_bus(adap);
···
 
 MODULE_DEVICE_TABLE(of, i2c_gpio_dt_ids);
 
+static const struct acpi_device_id i2c_gpio_acpi_match[] = {
+	{ "LOON0005" }, /* LoongArch */
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, i2c_gpio_acpi_match);
+
 static struct platform_driver i2c_gpio_driver = {
 	.driver		= {
 		.name	= "i2c-gpio",
 		.of_match_table	= i2c_gpio_dt_ids,
+		.acpi_match_table = i2c_gpio_acpi_match,
 	},
 	.probe		= i2c_gpio_probe,
 	.remove		= i2c_gpio_remove,

drivers/i2c/busses/i2c-gxp.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/* Copyright (C) 2022 Hewlett-Packard Enterprise Development Company, L.P. */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#define GXP_MAX_I2C_ENGINE 10
+static const char * const gxp_i2c_name[] = {
+	"gxp-i2c0", "gxp-i2c1", "gxp-i2c2", "gxp-i2c3",
+	"gxp-i2c4", "gxp-i2c5", "gxp-i2c6", "gxp-i2c7",
+	"gxp-i2c8", "gxp-i2c9" };
+
+/* GXP I2C Global interrupt status/enable register*/
+#define GXP_I2CINTSTAT		0x00
+#define GXP_I2CINTEN		0x04
+
+/* GXP I2C registers */
+#define GXP_I2CSTAT		0x00
+#define MASK_STOP_EVENT		0x20
+#define MASK_ACK		0x08
+#define MASK_RW			0x04
+#define GXP_I2CEVTERR		0x01
+#define MASK_SLAVE_CMD_EVENT	0x01
+#define MASK_SLAVE_DATA_EVENT	0x02
+#define MASK_MASTER_EVENT	0x10
+#define GXP_I2CSNPDAT		0x02
+#define GXP_I2CMCMD		0x04
+#define GXP_I2CSCMD		0x06
+#define GXP_I2CSNPAA		0x09
+#define GXP_I2CADVFEAT		0x0A
+#define GXP_I2COWNADR		0x0B
+#define GXP_I2CFREQDIV		0x0C
+#define GXP_I2CFLTFAIR		0x0D
+#define GXP_I2CTMOEDG		0x0E
+#define GXP_I2CCYCTIM		0x0F
+
+/* I2CSCMD Bits */
+#define SNOOP_EVT_CLR		0x80
+#define SLAVE_EVT_CLR		0x40
+#define	SNOOP_EVT_MASK		0x20
+#define SLAVE_EVT_MASK		0x10
+#define SLAVE_ACK_ENAB		0x08
+#define SLAVE_EVT_STALL		0x01
+
+/* I2CMCMD Bits */
+#define MASTER_EVT_CLR		0x80
+#define MASTER_ACK_ENAB		0x08
+#define RW_CMD			0x04
+#define STOP_CMD		0x02
+#define START_CMD		0x01
+
+/* I2CTMOEDG value */
+#define GXP_DATA_EDGE_RST_CTRL	0x0a /* 30ns */
+
+/* I2CFLTFAIR Bits */
+#define FILTER_CNT		0x30
+#define FAIRNESS_CNT		0x02
+
+enum {
+	GXP_I2C_IDLE = 0,
+	GXP_I2C_ADDR_PHASE,
+	GXP_I2C_RDATA_PHASE,
+	GXP_I2C_WDATA_PHASE,
+	GXP_I2C_ADDR_NACK,
+	GXP_I2C_DATA_NACK,
+	GXP_I2C_ERROR,
+	GXP_I2C_COMP
+};
+
+struct gxp_i2c_drvdata {
+	struct device *dev;
+	void __iomem *base;
+	struct i2c_timings t;
+	u32 engine;
+	int irq;
+	struct completion completion;
+	struct i2c_adapter adapter;
+	struct i2c_msg *curr_msg;
+	int msgs_remaining;
+	int msgs_num;
+	u8 *buf;
+	size_t buf_remaining;
+	unsigned char state;
+	struct i2c_client *slave;
+	unsigned char stopped;
+};
+
+static struct regmap *i2cg_map;
+
+static void gxp_i2c_start(struct gxp_i2c_drvdata *drvdata)
+{
+	u16 value;
+
+	drvdata->buf = drvdata->curr_msg->buf;
+	drvdata->buf_remaining = drvdata->curr_msg->len;
+
+	/* Note: Address in struct i2c_msg is 7 bits */
+	value = drvdata->curr_msg->addr << 9;
+
+	/* Read or Write */
+	value |= drvdata->curr_msg->flags & I2C_M_RD ? RW_CMD | START_CMD : START_CMD;
+
+	drvdata->state = GXP_I2C_ADDR_PHASE;
+	writew(value, drvdata->base + GXP_I2CMCMD);
+}
+
+static int gxp_i2c_master_xfer(struct i2c_adapter *adapter,
+			       struct i2c_msg *msgs, int num)
+{
+	int ret;
+	struct gxp_i2c_drvdata *drvdata = i2c_get_adapdata(adapter);
+	unsigned long time_left;
+
+	drvdata->msgs_remaining = num;
+	drvdata->curr_msg = msgs;
+	drvdata->msgs_num = num;
+	reinit_completion(&drvdata->completion);
+
+	gxp_i2c_start(drvdata);
+
+	time_left = wait_for_completion_timeout(&drvdata->completion,
+						adapter->timeout);
+	ret = num - drvdata->msgs_remaining;
+	if (time_left == 0) {
+		switch (drvdata->state) {
+		case GXP_I2C_WDATA_PHASE:
+			break;
+		case GXP_I2C_RDATA_PHASE:
+			break;
+		case GXP_I2C_ADDR_PHASE:
+			break;
+		default:
+			break;
+		}
+		return -ETIMEDOUT;
+	}
+
+	if (drvdata->state == GXP_I2C_ADDR_NACK ||
+	    drvdata->state == GXP_I2C_DATA_NACK)
+		return -EIO;
+
+	return ret;
+}
+
+static u32 gxp_i2c_func(struct i2c_adapter *adap)
+{
+	if (IS_ENABLED(CONFIG_I2C_SLAVE))
+		return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SLAVE;
+
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+#if IS_ENABLED(CONFIG_I2C_SLAVE)
+static int gxp_i2c_reg_slave(struct i2c_client *slave)
+{
+	struct gxp_i2c_drvdata *drvdata = i2c_get_adapdata(slave->adapter);
+
+	if (drvdata->slave)
+		return -EBUSY;
+
+	if (slave->flags & I2C_CLIENT_TEN)
+		return -EAFNOSUPPORT;
+
+	drvdata->slave = slave;
+
+	writeb(slave->addr << 1, drvdata->base + GXP_I2COWNADR);
+	writeb(SLAVE_EVT_CLR | SNOOP_EVT_MASK | SLAVE_ACK_ENAB |
+	       SLAVE_EVT_STALL, drvdata->base + GXP_I2CSCMD);
+
+	return 0;
+}
+
+static int gxp_i2c_unreg_slave(struct i2c_client *slave)
+{
+	struct gxp_i2c_drvdata *drvdata = i2c_get_adapdata(slave->adapter);
+
+	WARN_ON(!drvdata->slave);
+
+	writeb(0x00, drvdata->base + GXP_I2COWNADR);
+	writeb(SNOOP_EVT_CLR | SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+	       SLAVE_EVT_MASK, drvdata->base + GXP_I2CSCMD);
+
+	drvdata->slave = NULL;
+
+	return 0;
+}
+#endif
+
+static const struct i2c_algorithm gxp_i2c_algo = {
+	.master_xfer   = gxp_i2c_master_xfer,
+	.functionality = gxp_i2c_func,
+#if IS_ENABLED(CONFIG_I2C_SLAVE)
+	.reg_slave     = gxp_i2c_reg_slave,
+	.unreg_slave   = gxp_i2c_unreg_slave,
+#endif
+};
+
+static void gxp_i2c_stop(struct gxp_i2c_drvdata *drvdata)
+{
+	/* Clear event and send stop */
+	writeb(MASTER_EVT_CLR | STOP_CMD, drvdata->base + GXP_I2CMCMD);
+
+	complete(&drvdata->completion);
+}
+
+static void gxp_i2c_restart(struct gxp_i2c_drvdata *drvdata)
+{
+	u16 value;
+
+	drvdata->buf = drvdata->curr_msg->buf;
+	drvdata->buf_remaining = drvdata->curr_msg->len;
+
+	value = drvdata->curr_msg->addr << 9;
+
+	if (drvdata->curr_msg->flags & I2C_M_RD) {
+		/* Read and clear master event */
+		value |= MASTER_EVT_CLR | RW_CMD | START_CMD;
+	} else {
+		/* Write and clear master event */
+		value |= MASTER_EVT_CLR | START_CMD;
+	}
+
+	drvdata->state = GXP_I2C_ADDR_PHASE;
+
+	writew(value, drvdata->base + GXP_I2CMCMD);
+}
+
+static void gxp_i2c_chk_addr_ack(struct gxp_i2c_drvdata *drvdata)
+{
+	u16 value;
+
+	value = readb(drvdata->base + GXP_I2CSTAT);
+	if (!(value & MASK_ACK)) {
+		/* Got no ack, stop */
+		drvdata->state = GXP_I2C_ADDR_NACK;
+		gxp_i2c_stop(drvdata);
+		return;
+	}
+
+	if (drvdata->curr_msg->flags & I2C_M_RD) {
+		/* Start to read data from slave */
+		if (drvdata->buf_remaining == 0) {
+			/* No more data to read, stop */
+			drvdata->msgs_remaining--;
+			drvdata->state = GXP_I2C_COMP;
+			gxp_i2c_stop(drvdata);
+			return;
+		}
+		drvdata->state = GXP_I2C_RDATA_PHASE;
+
+		if (drvdata->buf_remaining == 1) {
+			/* The last data, do not ack */
+			writeb(MASTER_EVT_CLR | RW_CMD,
+			       drvdata->base + GXP_I2CMCMD);
+		} else {
+			/* Read data and ack it */
+			writeb(MASTER_EVT_CLR | MASTER_ACK_ENAB |
+			       RW_CMD, drvdata->base + GXP_I2CMCMD);
+		}
+	} else {
+		/* Start to write first data to slave */
+		if (drvdata->buf_remaining == 0) {
+			/* No more data to write, stop */
+			drvdata->msgs_remaining--;
+			drvdata->state = GXP_I2C_COMP;
+			gxp_i2c_stop(drvdata);
+			return;
+		}
+		value = *drvdata->buf;
+		value = value << 8;
+		/* Clear master event */
+		value |= MASTER_EVT_CLR;
+		drvdata->buf++;
+		drvdata->buf_remaining--;
+		drvdata->state = GXP_I2C_WDATA_PHASE;
+		writew(value, drvdata->base + GXP_I2CMCMD);
+	}
+}
+
+static void gxp_i2c_ack_data(struct gxp_i2c_drvdata *drvdata)
+{
+	u8 value;
+
+	/* Store the data returned */
+	value = readb(drvdata->base + GXP_I2CSNPDAT);
+	*drvdata->buf = value;
+	drvdata->buf++;
+	drvdata->buf_remaining--;
+
+	if (drvdata->buf_remaining == 0) {
+		/* No more data, this message is completed. */
+		drvdata->msgs_remaining--;
+
+		if (drvdata->msgs_remaining == 0) {
+			/* No more messages, stop */
+			drvdata->state = GXP_I2C_COMP;
+			gxp_i2c_stop(drvdata);
+			return;
+		}
+		/* Move to next message and start transfer */
+		drvdata->curr_msg++;
+		gxp_i2c_restart(drvdata);
+		return;
+	}
+
+	/* Ack the slave to make it send next byte */
+	drvdata->state = GXP_I2C_RDATA_PHASE;
+	if (drvdata->buf_remaining == 1) {
+		/* The last data, do not ack */
+		writeb(MASTER_EVT_CLR | RW_CMD,
+		       drvdata->base + GXP_I2CMCMD);
+	} else {
+		/* Read data and ack it */
+		writeb(MASTER_EVT_CLR | MASTER_ACK_ENAB |
+		       RW_CMD, drvdata->base + GXP_I2CMCMD);
+	}
+}
+
+static void gxp_i2c_chk_data_ack(struct gxp_i2c_drvdata *drvdata)
+{
+	u16 value;
+
+	value = readb(drvdata->base + GXP_I2CSTAT);
+	if (!(value & MASK_ACK)) {
+		/* Received No ack, stop */
+		drvdata->state = GXP_I2C_DATA_NACK;
+		gxp_i2c_stop(drvdata);
+		return;
+	}
+
+	/* Got ack, check if there is more data to write */
+	if (drvdata->buf_remaining == 0) {
+		/* No more data, this message is completed */
+		drvdata->msgs_remaining--;
+
+		if (drvdata->msgs_remaining == 0) {
+			/* No more messages, stop */
+			drvdata->state = GXP_I2C_COMP;
+			gxp_i2c_stop(drvdata);
+			return;
+		}
+		/* Move to next message and start transfer */
+		drvdata->curr_msg++;
+		gxp_i2c_restart(drvdata);
+		return;
+	}
+
+	/* Write data to slave */
+	value = *drvdata->buf;
+	value = value << 8;
+
+	/* Clear master event */
+	value |= MASTER_EVT_CLR;
+	drvdata->buf++;
+	drvdata->buf_remaining--;
+	drvdata->state = GXP_I2C_WDATA_PHASE;
+	writew(value, drvdata->base + GXP_I2CMCMD);
+}
+
+#if IS_ENABLED(CONFIG_I2C_SLAVE)
+static bool gxp_i2c_slave_irq_handler(struct gxp_i2c_drvdata *drvdata)
+{
+	u8 value;
+	u8 buf;
+	int ret;
+
+	value = readb(drvdata->base + GXP_I2CEVTERR);
+
+	/* Received start or stop event */
+	if (value & MASK_SLAVE_CMD_EVENT) {
+		value = readb(drvdata->base + GXP_I2CSTAT);
+		/* Master sent stop */
+		if (value & MASK_STOP_EVENT) {
+			if (drvdata->stopped == 0)
+				i2c_slave_event(drvdata->slave, I2C_SLAVE_STOP, &buf);
+			writeb(SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+			       SLAVE_ACK_ENAB | SLAVE_EVT_STALL, drvdata->base + GXP_I2CSCMD);
+			drvdata->stopped = 1;
+		} else {
+			/* Master sent start and  wants to read */
+			drvdata->stopped = 0;
+			if (value & MASK_RW) {
+				i2c_slave_event(drvdata->slave,
+						I2C_SLAVE_READ_REQUESTED, &buf);
+				value = buf << 8 | (SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+						    SLAVE_EVT_STALL);
+				writew(value, drvdata->base + GXP_I2CSCMD);
+			} else {
+				/* Master wants to write to us */
+				ret = i2c_slave_event(drvdata->slave,
+						      I2C_SLAVE_WRITE_REQUESTED, &buf);
+				if (!ret) {
+					/* Ack next byte from master */
+					writeb(SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+					       SLAVE_ACK_ENAB | SLAVE_EVT_STALL,
+					       drvdata->base + GXP_I2CSCMD);
+				} else {
+					/* Nack next byte from master */
+					writeb(SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+					       SLAVE_EVT_STALL, drvdata->base + GXP_I2CSCMD);
+				}
+			}
+		}
+	} else if (value & MASK_SLAVE_DATA_EVENT) {
+		value = readb(drvdata->base + GXP_I2CSTAT);
+		/* Master wants to read */
+		if (value & MASK_RW) {
+			/* Master wants another byte */
+			if (value & MASK_ACK) {
+				i2c_slave_event(drvdata->slave,
+						I2C_SLAVE_READ_PROCESSED, &buf);
+				value = buf << 8 | (SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+						    SLAVE_EVT_STALL);
+				writew(value, drvdata->base + GXP_I2CSCMD);
+			} else {
+				/* No more bytes needed */
+				writew(SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+				       SLAVE_ACK_ENAB | SLAVE_EVT_STALL,
+				       drvdata->base + GXP_I2CSCMD);
+			}
+		} else {
+			/* Master wants to write to us */
+			value = readb(drvdata->base + GXP_I2CSNPDAT);
+			buf = (uint8_t)value;
+			ret = i2c_slave_event(drvdata->slave,
+					      I2C_SLAVE_WRITE_RECEIVED, &buf);
+			if (!ret) {
+				/* Ack next byte from master */
+				writeb(SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+				       SLAVE_ACK_ENAB | SLAVE_EVT_STALL,
+				       drvdata->base + GXP_I2CSCMD);
+			} else {
+				/* Nack next byte from master */
+				writeb(SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+				       SLAVE_EVT_STALL, drvdata->base + GXP_I2CSCMD);
+			}
+		}
+	} else {
+		return false;
+	}
+
+	return true;
+}
+#endif
+
+static irqreturn_t gxp_i2c_irq_handler(int irq, void *_drvdata)
+{
+	struct gxp_i2c_drvdata *drvdata = (struct gxp_i2c_drvdata *)_drvdata;
+	u32 value;
+
+	/* Check if the interrupt is for the current engine */
+	regmap_read(i2cg_map, GXP_I2CINTSTAT, &value);
+	if (!(value & BIT(drvdata->engine)))
+		return IRQ_NONE;
+
+	value = readb(drvdata->base + GXP_I2CEVTERR);
+
+	/* Error */
+	if (value & ~(MASK_MASTER_EVENT | MASK_SLAVE_CMD_EVENT |
+				MASK_SLAVE_DATA_EVENT)) {
+		/* Clear all events */
+		writeb(0x00, drvdata->base + GXP_I2CEVTERR);
+		drvdata->state = GXP_I2C_ERROR;
+		gxp_i2c_stop(drvdata);
+		return IRQ_HANDLED;
+	}
+
+	if (IS_ENABLED(CONFIG_I2C_SLAVE)) {
+		/* Slave mode */
+		if (value & (MASK_SLAVE_CMD_EVENT | MASK_SLAVE_DATA_EVENT)) {
+			if (gxp_i2c_slave_irq_handler(drvdata))
+				return IRQ_HANDLED;
+			return IRQ_NONE;
+		}
+	}
+
+	/*  Master mode */
+	switch (drvdata->state) {
+	case GXP_I2C_ADDR_PHASE:
+		gxp_i2c_chk_addr_ack(drvdata);
+		break;
+
+	case GXP_I2C_RDATA_PHASE:
+		gxp_i2c_ack_data(drvdata);
+		break;
+
+	case GXP_I2C_WDATA_PHASE:
+		gxp_i2c_chk_data_ack(drvdata);
+		break;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void gxp_i2c_init(struct gxp_i2c_drvdata *drvdata)
+{
+	drvdata->state = GXP_I2C_IDLE;
+	writeb(2000000 / drvdata->t.bus_freq_hz,
+	       drvdata->base + GXP_I2CFREQDIV);
+	writeb(FILTER_CNT | FAIRNESS_CNT,
+	       drvdata->base + GXP_I2CFLTFAIR);
+	writeb(GXP_DATA_EDGE_RST_CTRL, drvdata->base + GXP_I2CTMOEDG);
+	writeb(0x00, drvdata->base + GXP_I2CCYCTIM);
+	writeb(0x00, drvdata->base + GXP_I2CSNPAA);
+	writeb(0x00, drvdata->base + GXP_I2CADVFEAT);
+	writeb(SNOOP_EVT_CLR | SLAVE_EVT_CLR | SNOOP_EVT_MASK |
+	       SLAVE_EVT_MASK, drvdata->base + GXP_I2CSCMD);
+	writeb(MASTER_EVT_CLR, drvdata->base + GXP_I2CMCMD);
+	writeb(0x00, drvdata->base + GXP_I2CEVTERR);
+	writeb(0x00, drvdata->base + GXP_I2COWNADR);
+}
+
+static int gxp_i2c_probe(struct platform_device *pdev)
+{
+	struct gxp_i2c_drvdata *drvdata;
+	int rc;
+	struct i2c_adapter *adapter;
+
+	if (!i2cg_map) {
+		i2cg_map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
+							   "hpe,sysreg");
+		if (IS_ERR(i2cg_map)) {
+			return dev_err_probe(&pdev->dev, IS_ERR(i2cg_map),
+					     "failed to map i2cg_handle\n");
+		}
+
+		/* Disable interrupt */
+		regmap_update_bits(i2cg_map, GXP_I2CINTEN, 0x00000FFF, 0);
+	}
+
+	drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata),
+			       GFP_KERNEL);
+	if (!drvdata)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, drvdata);
+	drvdata->dev = &pdev->dev;
+	init_completion(&drvdata->completion);
+
+	drvdata->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(drvdata->base))
+		return PTR_ERR(drvdata->base);
+
+	/* Use physical memory address to determine which I2C engine this is. */
+	drvdata->engine = ((size_t)drvdata->base & 0xf00) >> 8;
+
+	if (drvdata->engine >= GXP_MAX_I2C_ENGINE) {
+		return dev_err_probe(&pdev->dev, -EINVAL, "i2c engine% is unsupported\n",
+			drvdata->engine);
+	}
+
+	rc = platform_get_irq(pdev, 0);
+	if (rc < 0)
+		return rc;
+
+	drvdata->irq = rc;
+	rc = devm_request_irq(&pdev->dev, drvdata->irq, gxp_i2c_irq_handler,
+			      IRQF_SHARED, gxp_i2c_name[drvdata->engine], drvdata);
+	if (rc < 0)
+		return dev_err_probe(&pdev->dev, rc, "irq request failed\n");
+
+	i2c_parse_fw_timings(&pdev->dev, &drvdata->t, true);
+
+	gxp_i2c_init(drvdata);
+
+	/* Enable interrupt */
+	regmap_update_bits(i2cg_map, GXP_I2CINTEN, BIT(drvdata->engine),
+			   BIT(drvdata->engine));
+
+	adapter = &drvdata->adapter;
+	i2c_set_adapdata(adapter, drvdata);
+
+	adapter->owner = THIS_MODULE;
+	strscpy(adapter->name, "HPE GXP I2C adapter", sizeof(adapter->name));
+	adapter->algo = &gxp_i2c_algo;
+	adapter->dev.parent = &pdev->dev;
+	adapter->dev.of_node = pdev->dev.of_node;
+
+	rc = i2c_add_adapter(adapter);
+	if (rc)
+		return dev_err_probe(&pdev->dev, rc, "i2c add adapter failed\n");
+
+	return 0;
+}
+
+static int gxp_i2c_remove(struct platform_device *pdev)
+{
+	struct gxp_i2c_drvdata *drvdata = platform_get_drvdata(pdev);
+
+	/* Disable interrupt */
+	regmap_update_bits(i2cg_map, GXP_I2CINTEN, BIT(drvdata->engine), 0);
+	i2c_del_adapter(&drvdata->adapter);
+
+	return 0;
+}
+
+static const struct of_device_id gxp_i2c_of_match[] = {
+	{ .compatible = "hpe,gxp-i2c" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, gxp_i2c_of_match);
+
+static struct platform_driver gxp_i2c_driver = {
+	.probe	= gxp_i2c_probe,
+	.remove = gxp_i2c_remove,
+	.driver = {
+		.name = "gxp-i2c",
+		.of_match_table = gxp_i2c_of_match,
+	},
+};
+module_platform_driver(gxp_i2c_driver);
+
+MODULE_AUTHOR("Nick Hawkins <[e-mail]>");
+MODULE_DESCRIPTION("HPE GXP I2C bus driver");
+MODULE_LICENSE("GPL");

drivers/i2c/busses/i2c-i801.c

···
 		busy = status & SMBHSTSTS_HOST_BUSY;
 		status &= STATUS_ERROR_FLAGS | SMBHSTSTS_INTR;
 		if (!busy && status)
-			return status;
+			return status & STATUS_ERROR_FLAGS;
 	} while (time_is_after_eq_jiffies(timeout));
 
 	return -ETIMEDOUT;
···
 
 static int i801_transaction(struct i801_priv *priv, int xact)
 {
-	int status;
 	unsigned long result;
 	const struct i2c_adapter *adap = &priv->adapter;
-
-	status = i801_check_pre(priv);
-	if (status < 0)
-		return status;
 
 	if (priv->features & FEATURE_IRQ) {
 		reinit_completion(&priv->done);
 		outb_p(xact | SMBHSTCNT_INTREN | SMBHSTCNT_START,
 		       SMBHSTCNT(priv));
 		result = wait_for_completion_timeout(&priv->done, adap->timeout);
-		return i801_check_post(priv, result ? priv->status : -ETIMEDOUT);
+		return result ? priv->status : -ETIMEDOUT;
 	}
 
 	outb_p(xact | SMBHSTCNT_START, SMBHSTCNT(priv));
 
-	status = i801_wait_intr(priv);
-	return i801_check_post(priv, status);
+	return i801_wait_intr(priv);
 }
 
 static int i801_block_transaction_by_block(struct i801_priv *priv,
···
 
 	status = i801_transaction(priv, xact);
 	if (status)
-		return status;
+		goto out;
 
 	if (read_write == I2C_SMBUS_READ ||
 	    command == I2C_SMBUS_BLOCK_PROC_CALL) {
 		len = inb_p(SMBHSTDAT0(priv));
-		if (len < 1 || len > I2C_SMBUS_BLOCK_MAX)
-			return -EPROTO;
+		if (len < 1 || len > I2C_SMBUS_BLOCK_MAX) {
+			status = -EPROTO;
+			goto out;
+		}
 
 		data->block[0] = len;
 		for (i = 0; i < len; i++)
 			data->block[i + 1] = inb_p(SMBBLKDAT(priv));
 	}
-	return 0;
+out:
+	outb_p(inb_p(SMBAUXCTL(priv)) & ~SMBAUXCTL_E32B, SMBAUXCTL(priv));
+	return status;
 }
 
 static void i801_isr_byte_done(struct i801_priv *priv)
···
 		/* Write next byte, except for IRQ after last byte */
 		outb_p(priv->data[++priv->count], SMBBLKDAT(priv));
 	}
-
-	/* Clear BYTE_DONE to continue with next byte */
-	outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
 }
 
 static irqreturn_t i801_host_notify_isr(struct i801_priv *priv)
···
  *      BUS_ERR - SMI# transaction collision
  *      FAILED - transaction was canceled due to a KILL request
  *    When any of these occur, update ->status and signal completion.
- *    ->status must be cleared before kicking off the next transaction.
  *
  * 2) For byte-by-byte (I2C read/write) transactions, one BYTE_DONE interrupt
  *    occurs for each byte of a byte-by-byte to prepare the next byte.
···
 	}
 
 	status = inb_p(SMBHSTSTS(priv));
-	if (status & SMBHSTSTS_BYTE_DONE)
+	if ((status & (SMBHSTSTS_BYTE_DONE | STATUS_ERROR_FLAGS)) == SMBHSTSTS_BYTE_DONE)
 		i801_isr_byte_done(priv);
 
 	/*
-	 * Clear remaining IRQ sources: Completion of last command, errors
-	 * and the SMB_ALERT signal. SMB_ALERT status is set after signal
-	 * assertion independently of the interrupt generation being blocked
-	 * or not so clear it always when the status is set.
+	 * Clear IRQ sources: SMB_ALERT status is set after signal assertion
+	 * independently of the interrupt generation being blocked or not
+	 * so clear it always when the status is set.
 	 */
-	status &= SMBHSTSTS_INTR | STATUS_ERROR_FLAGS | SMBHSTSTS_SMBALERT_STS;
-	if (status)
-		outb_p(status, SMBHSTSTS(priv));
-	status &= ~SMBHSTSTS_SMBALERT_STS; /* SMB_ALERT not reported */
-	/*
-	 * Report transaction result.
-	 * ->status must be cleared before the next transaction is started.
-	 */
+	status &= STATUS_FLAGS | SMBHSTSTS_SMBALERT_STS;
+	outb_p(status, SMBHSTSTS(priv));
+
+	status &= STATUS_ERROR_FLAGS | SMBHSTSTS_INTR;
 	if (status) {
-		priv->status = status;
+		priv->status = status & STATUS_ERROR_FLAGS;
 		complete(&priv->done);
 	}
 
···
 
 	if (command == I2C_SMBUS_BLOCK_PROC_CALL)
 		return -EOPNOTSUPP;
-
-	status = i801_check_pre(priv);
-	if (status < 0)
-		return status;
 
 	len = data->block[0];
 
···
 		reinit_completion(&priv->done);
 		outb_p(priv->cmd | SMBHSTCNT_START, SMBHSTCNT(priv));
 		result = wait_for_completion_timeout(&priv->done, adap->timeout);
-		return i801_check_post(priv, result ? priv->status : -ETIMEDOUT);
+		return result ? priv->status : -ETIMEDOUT;
 	}
 
 	for (i = 1; i <= len; i++) {
···
 
 		status = i801_wait_byte_done(priv);
 		if (status)
-			goto exit;
+			return status;
 
 		if (i == 1 && read_write == I2C_SMBUS_READ
 		 && command != I2C_SMBUS_I2C_BLOCK_DATA) {
···
 		outb_p(SMBHSTSTS_BYTE_DONE, SMBHSTSTS(priv));
 	}
 
-	status = i801_wait_intr(priv);
-exit:
-	return i801_check_post(priv, status);
+	return i801_wait_intr(priv);
+}
+
+static void i801_set_hstadd(struct i801_priv *priv, u8 addr, char read_write)
+{
+	outb_p((addr << 1) | (read_write & 0x01), SMBHSTADD(priv));
+}
+
+/* Single value transaction function */
+static int i801_simple_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
+				   u8 addr, u8 hstcmd, char read_write, int command)
+{
+	int xact, ret;
+
+	switch (command) {
+	case I2C_SMBUS_QUICK:
+		i801_set_hstadd(priv, addr, read_write);
+		xact = I801_QUICK;
+		break;
+	case I2C_SMBUS_BYTE:
+		i801_set_hstadd(priv, addr, read_write);
+		if (read_write == I2C_SMBUS_WRITE)
+			outb_p(hstcmd, SMBHSTCMD(priv));
+		xact = I801_BYTE;
+		break;
+	case I2C_SMBUS_BYTE_DATA:
+		i801_set_hstadd(priv, addr, read_write);
+		if (read_write == I2C_SMBUS_WRITE)
+			outb_p(data->byte, SMBHSTDAT0(priv));
+		outb_p(hstcmd, SMBHSTCMD(priv));
+		xact = I801_BYTE_DATA;
+		break;
+	case I2C_SMBUS_WORD_DATA:
+		i801_set_hstadd(priv, addr, read_write);
+		if (read_write == I2C_SMBUS_WRITE) {
+			outb_p(data->word & 0xff, SMBHSTDAT0(priv));
+			outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
+		}
+		outb_p(hstcmd, SMBHSTCMD(priv));
+		xact = I801_WORD_DATA;
+		break;
+	case I2C_SMBUS_PROC_CALL:
+		i801_set_hstadd(priv, addr, I2C_SMBUS_WRITE);
+		outb_p(data->word & 0xff, SMBHSTDAT0(priv));
+		outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
+		outb_p(hstcmd, SMBHSTCMD(priv));
+		read_write = I2C_SMBUS_READ;
+		xact = I801_PROC_CALL;
+		break;
+	default:
+		pci_err(priv->pci_dev, "Unsupported transaction %d\n", command);
+		return -EOPNOTSUPP;
+	}
+
+	ret = i801_transaction(priv, xact);
+	if (ret || read_write == I2C_SMBUS_WRITE)
+		return ret;
+
+	switch (command) {
+	case I2C_SMBUS_BYTE:
+	case I2C_SMBUS_BYTE_DATA:
+		data->byte = inb_p(SMBHSTDAT0(priv));
+		break;
+	case I2C_SMBUS_WORD_DATA:
+	case I2C_SMBUS_PROC_CALL:
+		data->word = inb_p(SMBHSTDAT0(priv)) +
+			     (inb_p(SMBHSTDAT1(priv)) << 8);
+		break;
+	}
+
+	return 0;
 }
 
 /* Block transaction function */
 static int i801_block_transaction(struct i801_priv *priv, union i2c_smbus_data *data,
-				  char read_write, int command)
+				  u8 addr, u8 hstcmd, char read_write, int command)
 {
 	int result = 0;
 	unsigned char hostc;
···
 	else if (data->block[0] < 1 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
 		return -EPROTO;
 
-	if (command == I2C_SMBUS_I2C_BLOCK_DATA) {
+	switch (command) {
+	case I2C_SMBUS_BLOCK_DATA:
+		i801_set_hstadd(priv, addr, read_write);
+		outb_p(hstcmd, SMBHSTCMD(priv));
+		break;
+	case I2C_SMBUS_I2C_BLOCK_DATA:
+		/*
+		 * NB: page 240 of ICH5 datasheet shows that the R/#W
+		 * bit should be cleared here, even when reading.
+		 * However if SPD Write Disable is set (Lynx Point and later),
+		 * the read will fail if we don't set the R/#W bit.
+		 */
+		i801_set_hstadd(priv, addr,
+				priv->original_hstcfg & SMBHSTCFG_SPD_WD ?
+				read_write : I2C_SMBUS_WRITE);
+		if (read_write == I2C_SMBUS_READ) {
+			/* NB: page 240 of ICH5 datasheet also shows
+			 * that DATA1 is the cmd field when reading
+			 */
+			outb_p(hstcmd, SMBHSTDAT1(priv));
+		} else
+			outb_p(hstcmd, SMBHSTCMD(priv));
+
 		if (read_write == I2C_SMBUS_WRITE) {
 			/* set I2C_EN bit in configuration register */
 			pci_read_config_byte(priv->pci_dev, SMBHSTCFG, &hostc);
···
 				"I2C block read is unsupported!\n");
 			return -EOPNOTSUPP;
 		}
+		break;
+	case I2C_SMBUS_BLOCK_PROC_CALL:
+		/* Needs to be flagged as write transaction */
+		i801_set_hstadd(priv, addr, I2C_SMBUS_WRITE);
+		outb_p(hstcmd, SMBHSTCMD(priv));
+		break;
 	}
 
 	/* Experience has shown that the block buffer can only be used for
···
 		       unsigned short flags, char read_write, u8 command,
 		       int size, union i2c_smbus_data *data)
 {
-	int hwpec;
-	int block = 0;
-	int ret, xact;
+	int hwpec, ret;
 	struct i801_priv *priv = i2c_get_adapdata(adap);
 
 	mutex_lock(&priv->acpi_lock);
···
 
 	pm_runtime_get_sync(&priv->pci_dev->dev);
 
+	ret = i801_check_pre(priv);
+	if (ret)
+		goto out;
+
 	hwpec = (priv->features & FEATURE_SMBUS_PEC) && (flags & I2C_CLIENT_PEC)
 		&& size != I2C_SMBUS_QUICK
 		&& size != I2C_SMBUS_I2C_BLOCK_DATA;
-
-	switch (size) {
-	case I2C_SMBUS_QUICK:
-		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
-		       SMBHSTADD(priv));
-		xact = I801_QUICK;
-		break;
-	case I2C_SMBUS_BYTE:
-		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
-		       SMBHSTADD(priv));
-		if (read_write == I2C_SMBUS_WRITE)
-			outb_p(command, SMBHSTCMD(priv));
-		xact = I801_BYTE;
-		break;
-	case I2C_SMBUS_BYTE_DATA:
-		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
-		       SMBHSTADD(priv));
-		outb_p(command, SMBHSTCMD(priv));
-		if (read_write == I2C_SMBUS_WRITE)
-			outb_p(data->byte, SMBHSTDAT0(priv));
-		xact = I801_BYTE_DATA;
-		break;
-	case I2C_SMBUS_WORD_DATA:
-		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
-		       SMBHSTADD(priv));
-		outb_p(command, SMBHSTCMD(priv));
-		if (read_write == I2C_SMBUS_WRITE) {
-			outb_p(data->word & 0xff, SMBHSTDAT0(priv));
-			outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
-		}
-		xact = I801_WORD_DATA;
-		break;
-	case I2C_SMBUS_PROC_CALL:
-		outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
-		outb_p(command, SMBHSTCMD(priv));
-		outb_p(data->word & 0xff, SMBHSTDAT0(priv));
-		outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1(priv));
-		xact = I801_PROC_CALL;
-		read_write = I2C_SMBUS_READ;
-		break;
-	case I2C_SMBUS_BLOCK_DATA:
-		outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
-		       SMBHSTADD(priv));
-		outb_p(command, SMBHSTCMD(priv));
-		block = 1;
-		break;
-	case I2C_SMBUS_I2C_BLOCK_DATA:
-		/*
-		 * NB: page 240 of ICH5 datasheet shows that the R/#W
-		 * bit should be cleared here, even when reading.
-		 * However if SPD Write Disable is set (Lynx Point and later),
-		 * the read will fail if we don't set the R/#W bit.
-		 */
-		outb_p(((addr & 0x7f) << 1) |
-		       ((priv->original_hstcfg & SMBHSTCFG_SPD_WD) ?
-			(read_write & 0x01) : 0),
-		       SMBHSTADD(priv));
-		if (read_write == I2C_SMBUS_READ) {
-			/* NB: page 240 of ICH5 datasheet also shows
-			 * that DATA1 is the cmd field when reading */
-			outb_p(command, SMBHSTDAT1(priv));
-		} else
-			outb_p(command, SMBHSTCMD(priv));
-		block = 1;
-		break;
-	case I2C_SMBUS_BLOCK_PROC_CALL:
-		/*
-		 * Bit 0 of the slave address register always indicate a write
-		 * command.
-		 */
-		outb_p((addr & 0x7f) << 1, SMBHSTADD(priv));
-		outb_p(command, SMBHSTCMD(priv));
-		block = 1;
-		break;
-	default:
-		dev_err(&priv->pci_dev->dev, "Unsupported transaction %d\n",
-			size);
-		ret = -EOPNOTSUPP;
-		goto out;
-	}
 
 	if (hwpec)	/* enable/disable hardware PEC */
 		outb_p(inb_p(SMBAUXCTL(priv)) | SMBAUXCTL_CRC, SMBAUXCTL(priv));
···
 		outb_p(inb_p(SMBAUXCTL(priv)) & (~SMBAUXCTL_CRC),
 		       SMBAUXCTL(priv));
 
-	if (block)
-		ret = i801_block_transaction(priv, data, read_write, size);
+	if (size == I2C_SMBUS_BLOCK_DATA ||
+	    size == I2C_SMBUS_I2C_BLOCK_DATA ||
+	    size == I2C_SMBUS_BLOCK_PROC_CALL)
+		ret = i801_block_transaction(priv, data, addr, command, read_write, size);
 	else
-		ret = i801_transaction(priv, xact);
+		ret = i801_simple_transaction(priv, data, addr, command, read_write, size);
+
+	ret = i801_check_post(priv, ret);
 
 	/* Some BIOSes don't like it when PEC is enabled at reboot or resume
-	   time, so we forcibly disable it after every transaction. Turn off
-	   E32B for the same reason. */
-	if (hwpec || block)
-		outb_p(inb_p(SMBAUXCTL(priv)) &
-		       ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
-
-	if (block)
-		goto out;
-	if (ret)
-		goto out;
-	if ((read_write == I2C_SMBUS_WRITE) || (xact == I801_QUICK))
-		goto out;
-
-	switch (xact) {
-	case I801_BYTE:	/* Result put in SMBHSTDAT0 */
-	case I801_BYTE_DATA:
-		data->byte = inb_p(SMBHSTDAT0(priv));
-		break;
-	case I801_WORD_DATA:
-	case I801_PROC_CALL:
-		data->word = inb_p(SMBHSTDAT0(priv)) +
-			     (inb_p(SMBHSTDAT1(priv)) << 8);
-		break;
-	}
-
+	 * time, so we forcibly disable it after every transaction.
+	 */
+	if (hwpec)
+		outb_p(inb_p(SMBAUXCTL(priv)) & ~SMBAUXCTL_CRC, SMBAUXCTL(priv));
 out:
 	/*
 	 * Unlock the SMBus device for use by BIOS/ACPI,
···
 	}
 	priv->features &= ~disable_features;
 
+	/* The block process call uses block buffer mode */
+	if (!(priv->features & FEATURE_BLOCK_BUFFER))
+		priv->features &= ~FEATURE_BLOCK_PROC;
+
 	err = pcim_enable_device(dev);
 	if (err) {
 		dev_err(&dev->dev, "Failed to enable SMBus PCI device (%d)\n",
···
 		outb_p(inb_p(SMBAUXCTL(priv)) &
 		       ~(SMBAUXCTL_CRC | SMBAUXCTL_E32B), SMBAUXCTL(priv));
 
-	/* Remember original Interrupt and Host Notify settings */
-	priv->original_hstcnt = inb_p(SMBHSTCNT(priv)) & ~SMBHSTCNT_KILL;
-	if (priv->features & FEATURE_HOST_NOTIFY)
-		priv->original_slvcmd = inb_p(SMBSLVCMD(priv));
-
 	/* Default timeout in interrupt mode: 200 ms */
 	priv->adapter.timeout = HZ / 5;
 
···
 	}
 	dev_info(&dev->dev, "SMBus using %s\n",
 		 priv->features & FEATURE_IRQ ? "PCI interrupt" : "polling");
+
+	/* Host notification uses an interrupt */
+	if (!(priv->features & FEATURE_IRQ))
+		priv->features &= ~FEATURE_HOST_NOTIFY;
+
+	/* Remember original Interrupt and Host Notify settings */
+	priv->original_hstcnt = inb_p(SMBHSTCNT(priv)) & ~SMBHSTCNT_KILL;
+	if (priv->features & FEATURE_HOST_NOTIFY)
+		priv->original_slvcmd = inb_p(SMBSLVCMD(priv));
 
 	i801_add_tco(priv);
 

drivers/i2c/busses/i2c-ls2x.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Loongson-2K/Loongson LS7A I2C master mode driver
+ *
+ * Copyright (C) 2013 Loongson Technology Corporation Limited.
+ * Copyright (C) 2014-2017 Lemote, Inc.
+ * Copyright (C) 2018-2022 Loongson Technology Corporation Limited.
+ *
+ * Originally written by liushaozong
+ * Rewritten for mainline by Binbin Zhou <[e-mail]>
+ */
+
+#include <linux/bits.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+#include <linux/iopoll.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/units.h>
+
+/* I2C Registers */
+#define I2C_LS2X_PRER		0x0 /* Freq Division Register(16 bits) */
+#define I2C_LS2X_CTR		0x2 /* Control Register */
+#define I2C_LS2X_TXR		0x3 /* Transport Data Register */
+#define I2C_LS2X_RXR		0x3 /* Receive Data Register */
+#define I2C_LS2X_CR		0x4 /* Command Control Register */
+#define I2C_LS2X_SR		0x4 /* State Register */
+
+/* Command Control Register Bit */
+#define LS2X_CR_START		BIT(7) /* Start signal */
+#define LS2X_CR_STOP		BIT(6) /* Stop signal */
+#define LS2X_CR_READ		BIT(5) /* Read signal */
+#define LS2X_CR_WRITE		BIT(4) /* Write signal */
+#define LS2X_CR_ACK		BIT(3) /* Response signal */
+#define LS2X_CR_IACK		BIT(0) /* Interrupt response signal */
+
+/* State Register Bit */
+#define LS2X_SR_NOACK		BIT(7) /* Receive NACK */
+#define LS2X_SR_BUSY		BIT(6) /* Bus busy state */
+#define LS2X_SR_AL		BIT(5) /* Arbitration lost */
+#define LS2X_SR_TIP		BIT(1) /* Transmission state */
+#define LS2X_SR_IF		BIT(0) /* Interrupt flag */
+
+/* Control Register Bit */
+#define LS2X_CTR_EN		BIT(7) /* 0: I2c frequency setting 1: Normal */
+#define LS2X_CTR_IEN		BIT(6) /* Enable i2c interrupt */
+#define LS2X_CTR_MST		BIT(5) /* 0: Slave mode 1: Master mode */
+#define CTR_FREQ_MASK		GENMASK(7, 6)
+#define CTR_READY_MASK		GENMASK(7, 5)
+
+/* The PCLK frequency from LPB */
+#define LS2X_I2C_PCLK_FREQ	(50 * HZ_PER_MHZ)
+
+/* The default bus frequency, which is an empirical value */
+#define LS2X_I2C_FREQ_STD	(33 * HZ_PER_KHZ)
+
+struct ls2x_i2c_priv {
+	struct i2c_adapter	adapter;
+	void __iomem		*base;
+	struct i2c_timings	i2c_t;
+	struct completion	cmd_complete;
+};
+
+/*
+ * Interrupt service routine.
+ * This gets called whenever an I2C interrupt occurs.
+ */
+static irqreturn_t ls2x_i2c_isr(int this_irq, void *dev_id)
+{
+	struct ls2x_i2c_priv *priv = dev_id;
+
+	if (!(readb(priv->base + I2C_LS2X_SR) & LS2X_SR_IF))
+		return IRQ_NONE;
+
+	writeb(LS2X_CR_IACK, priv->base + I2C_LS2X_CR);
+	complete(&priv->cmd_complete);
+	return IRQ_HANDLED;
+}
+
+/*
+ * The ls2x i2c controller supports standard mode and fast mode, so the
+ * maximum bus frequency is '400kHz'.
+ * The bus frequency is set to the empirical value of '33KHz' by default,
+ * but it can also be taken from ACPI or FDT for compatibility with more
+ * devices.
+ */
+static void ls2x_i2c_adjust_bus_speed(struct ls2x_i2c_priv *priv)
+{
+	struct i2c_timings *t = &priv->i2c_t;
+	struct device *dev = priv->adapter.dev.parent;
+	u32 acpi_speed = i2c_acpi_find_bus_speed(dev);
+
+	i2c_parse_fw_timings(dev, t, false);
+
+	if (acpi_speed || t->bus_freq_hz)
+		t->bus_freq_hz = max(t->bus_freq_hz, acpi_speed);
+	else
+		t->bus_freq_hz = LS2X_I2C_FREQ_STD;
+
+	/* Calculate and set i2c frequency. */
+	writew(LS2X_I2C_PCLK_FREQ / (5 * t->bus_freq_hz) - 1,
+	       priv->base + I2C_LS2X_PRER);
+}
+
+static void ls2x_i2c_init(struct ls2x_i2c_priv *priv)
+{
+	/* Set i2c frequency setting mode and disable interrupts. */
+	writeb(readb(priv->base + I2C_LS2X_CTR) & ~CTR_FREQ_MASK,
+	       priv->base + I2C_LS2X_CTR);
+
+	ls2x_i2c_adjust_bus_speed(priv);
+
+	/* Set i2c normal operating mode and enable interrupts. */
+	writeb(readb(priv->base + I2C_LS2X_CTR) | CTR_READY_MASK,
+	       priv->base + I2C_LS2X_CTR);
+}
+
+static int ls2x_i2c_xfer_byte(struct ls2x_i2c_priv *priv, u8 txdata, u8 *rxdatap)
+{
+	u8 rxdata;
+	unsigned long time_left;
+
+	writeb(txdata, priv->base + I2C_LS2X_CR);
+
+	time_left = wait_for_completion_timeout(&priv->cmd_complete,
+						priv->adapter.timeout);
+	if (!time_left)
+		return -ETIMEDOUT;
+
+	rxdata = readb(priv->base + I2C_LS2X_SR);
+	if (rxdatap)
+		*rxdatap = rxdata;
+
+	return 0;
+}
+
+static int ls2x_i2c_send_byte(struct ls2x_i2c_priv *priv, u8 txdata)
+{
+	int ret;
+	u8 rxdata;
+
+	ret = ls2x_i2c_xfer_byte(priv, txdata, &rxdata);
+	if (ret)
+		return ret;
+
+	if (rxdata & LS2X_SR_AL)
+		return -EAGAIN;
+
+	if (rxdata & LS2X_SR_NOACK)
+		return -ENXIO;
+
+	return 0;
+}
+
+static int ls2x_i2c_stop(struct ls2x_i2c_priv *priv)
+{
+	u8 value;
+
+	writeb(LS2X_CR_STOP, priv->base + I2C_LS2X_CR);
+	return readb_poll_timeout(priv->base + I2C_LS2X_SR, value,
+				  !(value & LS2X_SR_BUSY), 100,
+				  jiffies_to_usecs(priv->adapter.timeout));
+}
+
+static int ls2x_i2c_start(struct ls2x_i2c_priv *priv, struct i2c_msg *msgs)
+{
+	reinit_completion(&priv->cmd_complete);
+
+	writeb(i2c_8bit_addr_from_msg(msgs), priv->base + I2C_LS2X_TXR);
+	return ls2x_i2c_send_byte(priv, LS2X_CR_START | LS2X_CR_WRITE);
+}
+
+static int ls2x_i2c_rx(struct ls2x_i2c_priv *priv, struct i2c_msg *msg)
+{
+	int ret;
+	u8 rxdata, *buf = msg->buf;
+	u16 len = msg->len;
+
+	/* Contains steps to send start condition and address. */
+	ret = ls2x_i2c_start(priv, msg);
+	if (ret)
+		return ret;
+
+	while (len--) {
+		ret = ls2x_i2c_xfer_byte(priv,
+					 LS2X_CR_READ | (len ? 0 : LS2X_CR_ACK),
+					 &rxdata);
+		if (ret)
+			return ret;
+
+		*buf++ = readb(priv->base + I2C_LS2X_RXR);
+	}
+
+	return 0;
+}
+
+static int ls2x_i2c_tx(struct ls2x_i2c_priv *priv, struct i2c_msg *msg)
+{
+	int ret;
+	u8 *buf = msg->buf;
+	u16 len = msg->len;
+
+	/* Contains steps to send start condition and address. */
+	ret = ls2x_i2c_start(priv, msg);
+	if (ret)
+		return ret;
+
+	while (len--) {
+		writeb(*buf++, priv->base + I2C_LS2X_TXR);
+
+		ret = ls2x_i2c_send_byte(priv, LS2X_CR_WRITE);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int ls2x_i2c_xfer_one(struct ls2x_i2c_priv *priv,
+			     struct i2c_msg *msg, bool stop)
+{
+	int ret;
+
+	if (msg->flags & I2C_M_RD)
+		ret = ls2x_i2c_rx(priv, msg);
+	else
+		ret = ls2x_i2c_tx(priv, msg);
+
+	if (ret < 0) {
+		/* Fatel error. Needs reinit. */
+		if (ret == -ETIMEDOUT)
+			ls2x_i2c_init(priv);
+
+		return ret;
+	}
+
+	if (stop) {
+		/* Failed to issue STOP. Needs reinit. */
+		ret = ls2x_i2c_stop(priv);
+		if (ret)
+			ls2x_i2c_init(priv);
+	}
+
+	return ret;
+}
+
+static int ls2x_i2c_master_xfer(struct i2c_adapter *adap,
+				struct i2c_msg *msgs, int num)
+{
+	int ret;
+	struct i2c_msg *msg, *emsg = msgs + num;
+	struct ls2x_i2c_priv *priv = i2c_get_adapdata(adap);
+
+	for (msg = msgs; msg < emsg; msg++) {
+		ret = ls2x_i2c_xfer_one(priv, msg, msg == emsg - 1);
+		if (ret)
+			return ret;
+	}
+
+	return num;
+}
+
+static unsigned int ls2x_i2c_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm ls2x_i2c_algo = {
+	.master_xfer	= ls2x_i2c_master_xfer,
+	.functionality	= ls2x_i2c_func,
+};
+
+static int ls2x_i2c_probe(struct platform_device *pdev)
+{
+	int ret, irq;
+	struct i2c_adapter *adap;
+	struct ls2x_i2c_priv *priv;
+	struct device *dev = &pdev->dev;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	/* Map hardware registers */
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	/* Add the i2c adapter */
+	adap = &priv->adapter;
+	adap->retries = 5;
+	adap->nr = pdev->id;
+	adap->dev.parent = dev;
+	adap->owner = THIS_MODULE;
+	adap->algo = &ls2x_i2c_algo;
+	adap->timeout = msecs_to_jiffies(100);
+	device_set_node(&adap->dev, dev_fwnode(dev));
+	i2c_set_adapdata(adap, priv);
+	strscpy(adap->name, pdev->name, sizeof(adap->name));
+	init_completion(&priv->cmd_complete);
+	platform_set_drvdata(pdev, priv);
+
+	ls2x_i2c_init(priv);
+
+	ret = devm_request_irq(dev, irq, ls2x_i2c_isr, IRQF_SHARED, "ls2x-i2c",
+			       priv);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "Unable to request irq %d\n", irq);
+
+	return devm_i2c_add_adapter(dev, adap);
+}
+
+static int ls2x_i2c_suspend(struct device *dev)
+{
+	struct ls2x_i2c_priv *priv = dev_get_drvdata(dev);
+
+	/* Disable interrupts */
+	writeb(readb(priv->base + I2C_LS2X_CTR) & ~LS2X_CTR_IEN,
+	       priv->base + I2C_LS2X_CTR);
+
+	return 0;
+}
+
+static int ls2x_i2c_resume(struct device *dev)
+{
+	ls2x_i2c_init(dev_get_drvdata(dev));
+	return 0;
+}
+
+static DEFINE_RUNTIME_DEV_PM_OPS(ls2x_i2c_pm_ops,
+				 ls2x_i2c_suspend, ls2x_i2c_resume, NULL);
+
+static const struct of_device_id ls2x_i2c_id_table[] = {
+	{ .compatible = "loongson,ls2k-i2c" },
+	{ .compatible = "loongson,ls7a-i2c" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ls2x_i2c_id_table);
+
+static const struct acpi_device_id ls2x_i2c_acpi_match[] = {
+	{ "LOON0004" }, /* Loongson LS7A */
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, ls2x_i2c_acpi_match);
+
+static struct platform_driver ls2x_i2c_driver = {
+	.probe		= ls2x_i2c_probe,
+	.driver		= {
+		.name	= "ls2x-i2c",
+		.pm	= pm_sleep_ptr(&ls2x_i2c_pm_ops),
+		.of_match_table = ls2x_i2c_id_table,
+		.acpi_match_table = ls2x_i2c_acpi_match,
+	},
+};
+module_platform_driver(ls2x_i2c_driver);
+
+MODULE_DESCRIPTION("Loongson LS2X I2C Bus driver");
+MODULE_AUTHOR("Loongson Technology Corporation Limited");
+MODULE_LICENSE("GPL");

drivers/i2c/busses/i2c-mt65xx.c

···
 {
 	int ret = 0;
 	struct mtk_i2c *i2c;
-	struct resource *res;
 	int i, irq, speed_clk;
 
 	i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
 	if (!i2c)
 		return -ENOMEM;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	i2c->base = devm_ioremap_resource(&pdev->dev, res);
+	i2c->base = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
 	if (IS_ERR(i2c->base))
 		return PTR_ERR(i2c->base);
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	i2c->pdmabase = devm_ioremap_resource(&pdev->dev, res);
+	i2c->pdmabase = devm_platform_get_and_ioremap_resource(pdev, 1, NULL);
 	if (IS_ERR(i2c->pdmabase))
 		return PTR_ERR(i2c->pdmabase);
 

drivers/i2c/busses/i2c-qcom-cci.c

···
 
 static const struct of_device_id cci_dt_match[] = {
 	{ .compatible = "qcom,msm8226-cci", .data = &cci_v1_data},
-	{ .compatible = "qcom,msm8916-cci", .data = &cci_v1_data},
 	{ .compatible = "qcom,msm8974-cci", .data = &cci_v1_5_data},
 	{ .compatible = "qcom,msm8996-cci", .data = &cci_v2_data},
+
+
+	/*
+	 * Legacy compatibles kept for backwards compatibility.
+	 * Do not add any new ones unless they introduce a new config
+	 */
+	{ .compatible = "qcom,msm8916-cci", .data = &cci_v1_data},
 	{ .compatible = "qcom,sdm845-cci", .data = &cci_v2_data},
 	{ .compatible = "qcom,sm8250-cci", .data = &cci_v2_data},
 	{ .compatible = "qcom,sm8450-cci", .data = &cci_v2_data},

drivers/i2c/busses/i2c-qcom-geni.c

···
 									NULL)
 };
 
-const struct geni_i2c_desc i2c_master_hub = {
+static const struct geni_i2c_desc i2c_master_hub = {
 	.has_core_clk = true,
 	.icc_ddr = NULL,
 	.no_dma_support = true,

drivers/i2c/busses/i2c-st.c

···
 	return (ret < 0) ? ret : i;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int st_i2c_suspend(struct device *dev)
 {
 	struct st_i2c_dev *i2c_dev = dev_get_drvdata(dev);
···
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(st_i2c_pm, st_i2c_suspend, st_i2c_resume);
-#define ST_I2C_PM	(&st_i2c_pm)
-#else
-#define ST_I2C_PM	NULL
-#endif
+static DEFINE_SIMPLE_DEV_PM_OPS(st_i2c_pm, st_i2c_suspend, st_i2c_resume);
 
 static u32 st_i2c_func(struct i2c_adapter *adap)
 {
···
 	.driver = {
 		.name = "st-i2c",
 		.of_match_table = st_i2c_match,
-		.pm = ST_I2C_PM,
+		.pm = pm_sleep_ptr(&st_i2c_pm),
 	},
 	.probe = st_i2c_probe,
 	.remove = st_i2c_remove,

drivers/i2c/busses/i2c-xiic.c

···
 #include <linux/pm_runtime.h>
 
 #define DRIVER_NAME "xiic-i2c"
+#define DYNAMIC_MODE_READ_BROKEN_BIT	BIT(0)
+#define SMBUS_BLOCK_READ_MIN_LEN	3
 
 enum xilinx_i2c_state {
 	STATE_DONE,
···
 enum xiic_endian {
 	LITTLE,
 	BIG
+};
+
+enum i2c_scl_freq {
+	REG_VALUES_100KHZ = 0,
+	REG_VALUES_400KHZ = 1,
+	REG_VALUES_1MHZ = 2
 };
 
 /**
···
  * @clk: Pointer to AXI4-lite input clock
  * @state: See STATE_
  * @singlemaster: Indicates bus is single master
+ * @dynamic: Mode of controller
+ * @prev_msg_tx: Previous message is Tx
+ * @quirks: To hold platform specific bug info
+ * @smbus_block_read: Flag to handle block read
+ * @input_clk: Input clock to I2C controller
+ * @i2c_clk: I2C SCL frequency
  */
 struct xiic_i2c {
 	struct device *dev;
···
 	struct clk *clk;
 	enum xilinx_i2c_state state;
 	bool singlemaster;
+	bool dynamic;
+	bool prev_msg_tx;
+	u32 quirks;
+	bool smbus_block_read;
+	unsigned long input_clk;
+	unsigned int i2c_clk;
+};
+
+struct xiic_version_data {
+	u32 quirks;
+};
+
+/**
+ * struct timing_regs - AXI I2C timing registers that depend on I2C spec
+ * @tsusta: setup time for a repeated START condition
+ * @tsusto: setup time for a STOP condition
+ * @thdsta: hold time for a repeated START condition
+ * @tsudat: setup time for data
+ * @tbuf: bus free time between STOP and START
+ */
+struct timing_regs {
+	unsigned int tsusta;
+	unsigned int tsusto;
+	unsigned int thdsta;
+	unsigned int tsudat;
+	unsigned int tbuf;
+};
+
+/* Reg values in ns derived from I2C spec and AXI I2C PG for different frequencies */
+static const struct timing_regs timing_reg_values[] = {
+	{ 5700, 5000, 4300, 550, 5000 }, /* Reg values for 100KHz */
+	{ 900, 900, 900, 400, 1600 },    /* Reg values for 400KHz */
+	{ 380, 380, 380, 170, 620 },     /* Reg values for 1MHz   */
 };
 
 #define XIIC_MSB_OFFSET 0
···
 #define XIIC_TBA_REG_OFFSET  (0x1C + XIIC_REG_OFFSET)	/* 10 Bit Address reg */
 #define XIIC_RFD_REG_OFFSET  (0x20 + XIIC_REG_OFFSET)	/* Rx FIFO Depth reg  */
 #define XIIC_GPO_REG_OFFSET  (0x24 + XIIC_REG_OFFSET)	/* Output Register    */
+
+/*
+ * Timing register offsets from RegisterBase. These are used only for
+ * setting i2c clock frequency for the line.
+ */
+#define XIIC_TSUSTA_REG_OFFSET (0x28 + XIIC_REG_OFFSET) /* TSUSTA Register */
+#define XIIC_TSUSTO_REG_OFFSET (0x2C + XIIC_REG_OFFSET) /* TSUSTO Register */
+#define XIIC_THDSTA_REG_OFFSET (0x30 + XIIC_REG_OFFSET) /* THDSTA Register */
+#define XIIC_TSUDAT_REG_OFFSET (0x34 + XIIC_REG_OFFSET) /* TSUDAT Register */
+#define XIIC_TBUF_REG_OFFSET   (0x38 + XIIC_REG_OFFSET) /* TBUF Register */
+#define XIIC_THIGH_REG_OFFSET  (0x3C + XIIC_REG_OFFSET) /* THIGH Register */
+#define XIIC_TLOW_REG_OFFSET   (0x40 + XIIC_REG_OFFSET) /* TLOW Register */
+#define XIIC_THDDAT_REG_OFFSET (0x44 + XIIC_REG_OFFSET) /* THDDAT Register */
 
 /* Control Register masks */
 #define XIIC_CR_ENABLE_DEVICE_MASK        0x01	/* Device enable = 1      */
···
  */
 #define XIIC_TX_DYN_START_MASK            0x0100 /* 1 = Set dynamic start */
 #define XIIC_TX_DYN_STOP_MASK             0x0200 /* 1 = Set dynamic stop */
+
+/* Dynamic mode constants */
+#define MAX_READ_LENGTH_DYNAMIC                255 /* Max length for dynamic read */
 
 /*
  * The following constants define the register offsets for the Interrupt
···
 	return 0;
 }
 
+static int xiic_wait_tx_empty(struct xiic_i2c *i2c)
+{
+	u8 isr;
+	unsigned long timeout;
+
+	timeout = jiffies + XIIC_I2C_TIMEOUT;
+	for (isr = xiic_getreg32(i2c, XIIC_IISR_OFFSET);
+		!(isr & XIIC_INTR_TX_EMPTY_MASK);
+			isr = xiic_getreg32(i2c, XIIC_IISR_OFFSET)) {
+		if (time_after(jiffies, timeout)) {
+			dev_err(i2c->dev, "Timeout waiting at Tx empty\n");
+			return -ETIMEDOUT;
+		}
+	}
+
+	return 0;
+}
+
+/**
+ * xiic_setclk - Sets the configured clock rate
+ * @i2c: Pointer to the xiic device structure
+ *
+ * The timing register values are calculated according to the input clock
+ * frequency and configured scl frequency. For details, please refer the
+ * AXI I2C PG and NXP I2C Spec.
+ * Supported frequencies are 100KHz, 400KHz and 1MHz.
+ *
+ * Return: 0 on success (Supported frequency selected or not configurable in SW)
+ *        -EINVAL on failure (scl frequency not supported or THIGH is 0)
+ */
+static int xiic_setclk(struct xiic_i2c *i2c)
+{
+	unsigned int clk_in_mhz;
+	unsigned int index = 0;
+	u32 reg_val;
+
+	dev_dbg(i2c->adap.dev.parent,
+		"%s entry, i2c->input_clk: %ld, i2c->i2c_clk: %d\n",
+		__func__, i2c->input_clk, i2c->i2c_clk);
+
+	/* If not specified in DT, do not configure in SW. Rely only on Vivado design */
+	if (!i2c->i2c_clk || !i2c->input_clk)
+		return 0;
+
+	clk_in_mhz = DIV_ROUND_UP(i2c->input_clk, 1000000);
+
+	switch (i2c->i2c_clk) {
+	case I2C_MAX_FAST_MODE_PLUS_FREQ:
+		index = REG_VALUES_1MHZ;
+		break;
+	case I2C_MAX_FAST_MODE_FREQ:
+		index = REG_VALUES_400KHZ;
+		break;
+	case I2C_MAX_STANDARD_MODE_FREQ:
+		index = REG_VALUES_100KHZ;
+		break;
+	default:
+		dev_warn(i2c->adap.dev.parent, "Unsupported scl frequency\n");
+		return -EINVAL;
+	}
+
+	/*
+	 * Value to be stored in a register is the number of clock cycles required
+	 * for the time duration. So the time is divided by the input clock time
+	 * period to get the number of clock cycles required. Refer Xilinx AXI I2C
+	 * PG document and I2C specification for further details.
+	 */
+
+	/* THIGH - Depends on SCL clock frequency(i2c_clk) as below */
+	reg_val = (DIV_ROUND_UP(i2c->input_clk, 2 * i2c->i2c_clk)) - 7;
+	if (reg_val == 0)
+		return -EINVAL;
+
+	xiic_setreg32(i2c, XIIC_THIGH_REG_OFFSET, reg_val - 1);
+
+	/* TLOW - Value same as THIGH */
+	xiic_setreg32(i2c, XIIC_TLOW_REG_OFFSET, reg_val - 1);
+
+	/* TSUSTA */
+	reg_val = (timing_reg_values[index].tsusta * clk_in_mhz) / 1000;
+	xiic_setreg32(i2c, XIIC_TSUSTA_REG_OFFSET, reg_val - 1);
+
+	/* TSUSTO */
+	reg_val = (timing_reg_values[index].tsusto * clk_in_mhz) / 1000;
+	xiic_setreg32(i2c, XIIC_TSUSTO_REG_OFFSET, reg_val - 1);
+
+	/* THDSTA */
+	reg_val = (timing_reg_values[index].thdsta * clk_in_mhz) / 1000;
+	xiic_setreg32(i2c, XIIC_THDSTA_REG_OFFSET, reg_val - 1);
+
+	/* TSUDAT */
+	reg_val = (timing_reg_values[index].tsudat * clk_in_mhz) / 1000;
+	xiic_setreg32(i2c, XIIC_TSUDAT_REG_OFFSET, reg_val - 1);
+
+	/* TBUF */
+	reg_val = (timing_reg_values[index].tbuf * clk_in_mhz) / 1000;
+	xiic_setreg32(i2c, XIIC_TBUF_REG_OFFSET, reg_val - 1);
+
+	/* THDDAT */
+	xiic_setreg32(i2c, XIIC_THDDAT_REG_OFFSET, 1);
+
+	return 0;
+}
+
 static int xiic_reinit(struct xiic_i2c *i2c)
 {
 	int ret;
 
 	xiic_setreg32(i2c, XIIC_RESETR_OFFSET, XIIC_RESET_MASK);
+
+	ret = xiic_setclk(i2c);
+	if (ret)
+		return ret;
 
 	/* Set receive Fifo depth to maximum (zero based). */
 	xiic_setreg8(i2c, XIIC_RFD_REG_OFFSET, IIC_RX_FIFO_DEPTH - 1);
···
 	xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, cr & ~XIIC_CR_ENABLE_DEVICE_MASK);
 }
 
+static void xiic_smbus_block_read_setup(struct xiic_i2c *i2c)
+{
+	u8 rxmsg_len, rfd_set = 0;
+
+	/*
+	 * Clear the I2C_M_RECV_LEN flag to avoid setting
+	 * message length again
+	 */
+	i2c->rx_msg->flags &= ~I2C_M_RECV_LEN;
+
+	/* Set smbus_block_read flag to identify in isr */
+	i2c->smbus_block_read = true;
+
+	/* Read byte from rx fifo and set message length */
+	rxmsg_len = xiic_getreg8(i2c, XIIC_DRR_REG_OFFSET);
+
+	i2c->rx_msg->buf[i2c->rx_pos++] = rxmsg_len;
+
+	/* Check if received length is valid */
+	if (rxmsg_len <= I2C_SMBUS_BLOCK_MAX) {
+		/* Set Receive fifo depth */
+		if (rxmsg_len > IIC_RX_FIFO_DEPTH) {
+			/*
+			 * When Rx msg len greater than or equal to Rx fifo capacity
+			 * Receive fifo depth should set to Rx fifo capacity minus 1
+			 */
+			rfd_set = IIC_RX_FIFO_DEPTH - 1;
+			i2c->rx_msg->len = rxmsg_len + 1;
+		} else if ((rxmsg_len == 1) ||
+			(rxmsg_len == 0)) {
+			/*
+			 * Minimum of 3 bytes required to exit cleanly. 1 byte
+			 * already received, Second byte is being received. Have
+			 * to set NACK in read_rx before receiving the last byte
+			 */
+			rfd_set = 0;
+			i2c->rx_msg->len = SMBUS_BLOCK_READ_MIN_LEN;
+		} else {
+			/*
+			 * When Rx msg len less than Rx fifo capacity
+			 * Receive fifo depth should set to Rx msg len minus 2
+			 */
+			rfd_set = rxmsg_len - 2;
+			i2c->rx_msg->len = rxmsg_len + 1;
+		}
+		xiic_setreg8(i2c, XIIC_RFD_REG_OFFSET, rfd_set);
+
+		return;
+	}
+
+	/* Invalid message length, trigger STATE_ERROR with tx_msg_len in ISR */
+	i2c->tx_msg->len = 3;
+	i2c->smbus_block_read = false;
+	dev_err(i2c->adap.dev.parent, "smbus_block_read Invalid msg length\n");
+}
+
 static void xiic_read_rx(struct xiic_i2c *i2c)
 {
-	u8 bytes_in_fifo;
+	u8 bytes_in_fifo, cr = 0, bytes_to_read = 0;
+	u32 bytes_rem = 0;
 	int i;
 
 	bytes_in_fifo = xiic_getreg8(i2c, XIIC_RFO_REG_OFFSET) + 1;
 
 	dev_dbg(i2c->adap.dev.parent,
-		"%s entry, bytes in fifo: %d, msg: %d, SR: 0x%x, CR: 0x%x\n",
+		"%s entry, bytes in fifo: %d, rem: %d, SR: 0x%x, CR: 0x%x\n",
 		__func__, bytes_in_fifo, xiic_rx_space(i2c),
 		xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
 		xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
···
 	if (bytes_in_fifo > xiic_rx_space(i2c))
 		bytes_in_fifo = xiic_rx_space(i2c);
 
-	for (i = 0; i < bytes_in_fifo; i++)
+	bytes_to_read = bytes_in_fifo;
+
+	if (!i2c->dynamic) {
+		bytes_rem = xiic_rx_space(i2c) - bytes_in_fifo;
+
+		/* Set msg length if smbus_block_read */
+		if (i2c->rx_msg->flags & I2C_M_RECV_LEN) {
+			xiic_smbus_block_read_setup(i2c);
+			return;
+		}
+
+		if (bytes_rem > IIC_RX_FIFO_DEPTH) {
+			bytes_to_read = bytes_in_fifo;
+		} else if (bytes_rem > 1) {
+			bytes_to_read = bytes_rem - 1;
+		} else if (bytes_rem == 1) {
+			bytes_to_read = 1;
+			/* Set NACK in CR to indicate slave transmitter */
+			cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET);
+			xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, cr |
+					XIIC_CR_NO_ACK_MASK);
+		} else if (bytes_rem == 0) {
+			bytes_to_read = bytes_in_fifo;
+
+			/* Generate stop on the bus if it is last message */
+			if (i2c->nmsgs == 1) {
+				cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET);
+				xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, cr &
+						~XIIC_CR_MSMS_MASK);
+			}
+
+			/* Make TXACK=0, clean up for next transaction */
+			cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET);
+			xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, cr &
+					~XIIC_CR_NO_ACK_MASK);
+		}
+	}
+
+	/* Read the fifo */
+	for (i = 0; i < bytes_to_read; i++) {
 		i2c->rx_msg->buf[i2c->rx_pos++] =
 			xiic_getreg8(i2c, XIIC_DRR_REG_OFFSET);
+	}
 
-	xiic_setreg8(i2c, XIIC_RFD_REG_OFFSET,
-		(xiic_rx_space(i2c) > IIC_RX_FIFO_DEPTH) ?
-		IIC_RX_FIFO_DEPTH - 1 :  xiic_rx_space(i2c) - 1);
+	if (i2c->dynamic) {
+		u8 bytes;
+
+		/* Receive remaining bytes if less than fifo depth */
+		bytes = min_t(u8, xiic_rx_space(i2c), IIC_RX_FIFO_DEPTH);
+		bytes--;
+		xiic_setreg8(i2c, XIIC_RFD_REG_OFFSET, bytes);
+	}
 }
 
 static int xiic_tx_fifo_space(struct xiic_i2c *i2c)
···
 
 		if (!xiic_tx_space(i2c) && i2c->nmsgs == 1) {
 			/* last message in transfer -> STOP */
-			data |= XIIC_TX_DYN_STOP_MASK;
+			if (i2c->dynamic) {
+				data |= XIIC_TX_DYN_STOP_MASK;
+			} else {
+				u8 cr;
+				int status;
+
+				/* Wait till FIFO is empty so STOP is sent last */
+				status = xiic_wait_tx_empty(i2c);
+				if (status)
+					return;
+
+				/* Write to CR to stop */
+				cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET);
+				xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, cr &
+					     ~XIIC_CR_MSMS_MASK);
+			}
 			dev_dbg(i2c->adap.dev.parent, "%s TX STOP\n", __func__);
 		}
 		xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, data);
···
 	dev_dbg(i2c->adap.dev.parent, "%s: SR: 0x%x, msg: %p, nmsgs: %d\n",
 		__func__, xiic_getreg8(i2c, XIIC_SR_REG_OFFSET),
 		i2c->tx_msg, i2c->nmsgs);
-
+	dev_dbg(i2c->adap.dev.parent, "%s, ISR: 0x%x, CR: 0x%x\n",
+		__func__, xiic_getreg32(i2c, XIIC_IISR_OFFSET),
+		xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
 
 	/* Service requesting interrupt */
 	if ((pend & XIIC_INTR_ARB_LOST_MASK) ||
···
 		/* The bus is not busy, disable BusNotBusy interrupt */
 		xiic_irq_dis(i2c, XIIC_INTR_BNB_MASK);
 
+		if (i2c->tx_msg && i2c->smbus_block_read) {
+			i2c->smbus_block_read = false;
+			/* Set requested message len=1 to indicate STATE_DONE */
+			i2c->tx_msg->len = 1;
+		}
+
 		if (!i2c->tx_msg)
 			goto out;
 
···
 static void xiic_start_recv(struct xiic_i2c *i2c)
 {
 	u16 rx_watermark;
+	u8 cr = 0, rfd_set = 0;
 	struct i2c_msg *msg = i2c->rx_msg = i2c->tx_msg;
 
-	/* Clear and enable Rx full interrupt. */
-	xiic_irq_clr_en(i2c, XIIC_INTR_RX_FULL_MASK | XIIC_INTR_TX_ERROR_MASK);
+	dev_dbg(i2c->adap.dev.parent, "%s entry, ISR: 0x%x, CR: 0x%x\n",
+		__func__, xiic_getreg32(i2c, XIIC_IISR_OFFSET),
+		xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
 
-	/* we want to get all but last byte, because the TX_ERROR IRQ is used
-	 * to inidicate error ACK on the address, and negative ack on the last
-	 * received byte, so to not mix them receive all but last.
-	 * In the case where there is only one byte to receive
-	 * we can check if ERROR and RX full is set at the same time
-	 */
-	rx_watermark = msg->len;
-	if (rx_watermark > IIC_RX_FIFO_DEPTH)
-		rx_watermark = IIC_RX_FIFO_DEPTH;
-	xiic_setreg8(i2c, XIIC_RFD_REG_OFFSET, (u8)(rx_watermark - 1));
+	/* Disable Tx interrupts */
+	xiic_irq_dis(i2c, XIIC_INTR_TX_HALF_MASK | XIIC_INTR_TX_EMPTY_MASK);
 
-	if (!(msg->flags & I2C_M_NOSTART))
+	if (i2c->dynamic) {
+		u8 bytes;
+		u16 val;
+
+		/* Clear and enable Rx full interrupt. */
+		xiic_irq_clr_en(i2c, XIIC_INTR_RX_FULL_MASK |
+				XIIC_INTR_TX_ERROR_MASK);
+
+		/*
+		 * We want to get all but last byte, because the TX_ERROR IRQ
+		 * is used to indicate error ACK on the address, and
+		 * negative ack on the last received byte, so to not mix
+		 * them receive all but last.
+		 * In the case where there is only one byte to receive
+		 * we can check if ERROR and RX full is set at the same time
+		 */
+		rx_watermark = msg->len;
+		bytes = min_t(u8, rx_watermark, IIC_RX_FIFO_DEPTH);
+
+		if (rx_watermark > 0)
+			bytes--;
+		xiic_setreg8(i2c, XIIC_RFD_REG_OFFSET, bytes);
+
 		/* write the address */
 		xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET,
-			i2c_8bit_addr_from_msg(msg) | XIIC_TX_DYN_START_MASK);
+			      i2c_8bit_addr_from_msg(msg) |
+			      XIIC_TX_DYN_START_MASK);
 
-	xiic_irq_clr_en(i2c, XIIC_INTR_BNB_MASK);
+		/* If last message, include dynamic stop bit with length */
+		val = (i2c->nmsgs == 1) ? XIIC_TX_DYN_STOP_MASK : 0;
+		val |= msg->len;
 
-	xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET,
-		msg->len | ((i2c->nmsgs == 1) ? XIIC_TX_DYN_STOP_MASK : 0));
+		xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, val);
+
+		xiic_irq_clr_en(i2c, XIIC_INTR_BNB_MASK);
+	} else {
+		/*
+		 * If previous message is Tx, make sure that Tx FIFO is empty
+		 * before starting a new transfer as the repeated start in
+		 * standard mode can corrupt the transaction if there are
+		 * still bytes to be transmitted in FIFO
+		 */
+		if (i2c->prev_msg_tx) {
+			int status;
+
+			status = xiic_wait_tx_empty(i2c);
+			if (status)
+				return;
+		}
+
+		cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET);
+
+		/* Set Receive fifo depth */
+		rx_watermark = msg->len;
+		if (rx_watermark > IIC_RX_FIFO_DEPTH) {
+			rfd_set = IIC_RX_FIFO_DEPTH - 1;
+		} else if (rx_watermark == 1) {
+			rfd_set = rx_watermark - 1;
+
+			/* Set No_ACK, except for smbus_block_read */
+			if (!(i2c->rx_msg->flags & I2C_M_RECV_LEN)) {
+				/* Handle single byte transfer separately */
+				cr |= XIIC_CR_NO_ACK_MASK;
+			}
+		} else if (rx_watermark == 0) {
+			rfd_set = rx_watermark;
+		} else {
+			rfd_set = rx_watermark - 2;
+		}
+		/* Check if RSTA should be set */
+		if (cr & XIIC_CR_MSMS_MASK) {
+			/* Already a master, RSTA should be set */
+			xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, (cr |
+					XIIC_CR_REPEATED_START_MASK) &
+					~(XIIC_CR_DIR_IS_TX_MASK));
+		}
+
+		xiic_setreg8(i2c, XIIC_RFD_REG_OFFSET, rfd_set);
+
+		/* Clear and enable Rx full and transmit complete interrupts */
+		xiic_irq_clr_en(i2c, XIIC_INTR_RX_FULL_MASK |
+				XIIC_INTR_TX_ERROR_MASK);
+
+		/* Write the address */
+		xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET,
+			      i2c_8bit_addr_from_msg(msg));
+
+		/* Write to Control Register,to start transaction in Rx mode */
+		if ((cr & XIIC_CR_MSMS_MASK) == 0) {
+			xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, (cr |
+					XIIC_CR_MSMS_MASK)
+					& ~(XIIC_CR_DIR_IS_TX_MASK));
+		}
+		dev_dbg(i2c->adap.dev.parent, "%s end, ISR: 0x%x, CR: 0x%x\n",
+			__func__, xiic_getreg32(i2c, XIIC_IISR_OFFSET),
+			xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
+	}
 
 	if (i2c->nmsgs == 1)
 		/* very last, enable bus not busy as well */
···
 
 	/* the message is tx:ed */
 	i2c->tx_pos = msg->len;
+
+	/* Enable interrupts */
+	xiic_setreg32(i2c, XIIC_DGIER_OFFSET, XIIC_GINTR_ENABLE_MASK);
+
+	i2c->prev_msg_tx = false;
 }
 
 static void xiic_start_send(struct xiic_i2c *i2c)
 {
+	u8 cr = 0;
+	u16 data;
 	struct i2c_msg *msg = i2c->tx_msg;
 
 	dev_dbg(i2c->adap.dev.parent, "%s entry, msg: %p, len: %d",
···
 		__func__, xiic_getreg32(i2c, XIIC_IISR_OFFSET),
 		xiic_getreg8(i2c, XIIC_CR_REG_OFFSET));
 
-	if (!(msg->flags & I2C_M_NOSTART)) {
+	if (i2c->dynamic) {
 		/* write the address */
-		u16 data = i2c_8bit_addr_from_msg(msg) |
-			XIIC_TX_DYN_START_MASK;
-		if ((i2c->nmsgs == 1) && msg->len == 0)
+		data = i2c_8bit_addr_from_msg(msg) |
+				XIIC_TX_DYN_START_MASK;
+
+		if (i2c->nmsgs == 1 && msg->len == 0)
 			/* no data and last message -> add STOP */
 			data |= XIIC_TX_DYN_STOP_MASK;
 
 		xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, data);
+
+		/* Clear any pending Tx empty, Tx Error and then enable them */
+		xiic_irq_clr_en(i2c, XIIC_INTR_TX_EMPTY_MASK |
+				XIIC_INTR_TX_ERROR_MASK |
+				XIIC_INTR_BNB_MASK |
+				((i2c->nmsgs > 1 || xiic_tx_space(i2c)) ?
+				XIIC_INTR_TX_HALF_MASK : 0));
+
+		xiic_fill_tx_fifo(i2c);
+	} else {
+		/*
+		 * If previous message is Tx, make sure that Tx FIFO is empty
+		 * before starting a new transfer as the repeated start in
+		 * standard mode can corrupt the transaction if there are
+		 * still bytes to be transmitted in FIFO
+		 */
+		if (i2c->prev_msg_tx) {
+			int status;
+
+			status = xiic_wait_tx_empty(i2c);
+			if (status)
+				return;
+		}
+		/* Check if RSTA should be set */
+		cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET);
+		if (cr & XIIC_CR_MSMS_MASK) {
+			/* Already a master, RSTA should be set */
+			xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, (cr |
+					XIIC_CR_REPEATED_START_MASK |
+					XIIC_CR_DIR_IS_TX_MASK) &
+					~(XIIC_CR_NO_ACK_MASK));
+		}
+
+		/* Write address to FIFO */
+		data = i2c_8bit_addr_from_msg(msg);
+		xiic_setreg16(i2c, XIIC_DTR_REG_OFFSET, data);
+
+		/* Fill fifo */
+		xiic_fill_tx_fifo(i2c);
+
+		if ((cr & XIIC_CR_MSMS_MASK) == 0) {
+			/* Start Tx by writing to CR */
+			cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET);
+			xiic_setreg8(i2c, XIIC_CR_REG_OFFSET, cr |
+					XIIC_CR_MSMS_MASK |
+					XIIC_CR_DIR_IS_TX_MASK);
+		}
+
+		/* Clear any pending Tx empty, Tx Error and then enable them */
+		xiic_irq_clr_en(i2c, XIIC_INTR_TX_EMPTY_MASK |
+				XIIC_INTR_TX_ERROR_MASK |
+				XIIC_INTR_BNB_MASK);
 	}
-
-	/* Clear any pending Tx empty, Tx Error and then enable them. */
-	xiic_irq_clr_en(i2c, XIIC_INTR_TX_EMPTY_MASK | XIIC_INTR_TX_ERROR_MASK |
-		XIIC_INTR_BNB_MASK |
-		((i2c->nmsgs > 1 || xiic_tx_space(i2c)) ?
-			XIIC_INTR_TX_HALF_MASK : 0));
-
-	xiic_fill_tx_fifo(i2c);
+	i2c->prev_msg_tx = true;
 }
 
 static void __xiic_start_xfer(struct xiic_i2c *i2c)
···
 
 static int xiic_start_xfer(struct xiic_i2c *i2c, struct i2c_msg *msgs, int num)
 {
-	int ret;
+	bool broken_read, max_read_len, smbus_blk_read;
+	int ret, count;
 
 	mutex_lock(&i2c->lock);
 
···
 	i2c->rx_msg = NULL;
 	i2c->nmsgs = num;
 	init_completion(&i2c->completion);
+
+	/* Decide standard mode or Dynamic mode */
+	i2c->dynamic = true;
+
+	/* Initialize prev message type */
+	i2c->prev_msg_tx = false;
+
+	/*
+	 * Scan through nmsgs, use dynamic mode when none of the below three
+	 * conditions occur. We need standard mode even if one condition holds
+	 * true in the entire array of messages in a single transfer.
+	 * If read transaction as dynamic mode is broken for delayed reads
+	 * in xlnx,axi-iic-2.0 / xlnx,xps-iic-2.00.a IP versions.
+	 * If read length is > 255 bytes.
+	 * If smbus_block_read transaction.
+	 */
+	for (count = 0; count < i2c->nmsgs; count++) {
+		broken_read = (i2c->quirks & DYNAMIC_MODE_READ_BROKEN_BIT) &&
+				(i2c->tx_msg[count].flags & I2C_M_RD);
+		max_read_len = (i2c->tx_msg[count].flags & I2C_M_RD) &&
+				(i2c->tx_msg[count].len > MAX_READ_LENGTH_DYNAMIC);
+		smbus_blk_read = (i2c->tx_msg[count].flags & I2C_M_RECV_LEN);
+
+		if (broken_read || max_read_len || smbus_blk_read) {
+			i2c->dynamic = false;
+			break;
+		}
+	}
 
 	ret = xiic_reinit(i2c);
 	if (!ret)
···
 		i2c->rx_msg = NULL;
 		i2c->nmsgs = 0;
 		err = -ETIMEDOUT;
-	} else if (err < 0) {	/* Completion error */
-		i2c->tx_msg = NULL;
-		i2c->rx_msg = NULL;
-		i2c->nmsgs = 0;
 	} else {
 		err = (i2c->state == STATE_DONE) ? num : -EIO;
 	}
···
 
 static u32 xiic_func(struct i2c_adapter *adap)
 {
-	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_SMBUS_BLOCK_DATA;
 }
 
 static const struct i2c_algorithm xiic_algorithm = {
···
 	.functionality = xiic_func,
 };
 
-static const struct i2c_adapter_quirks xiic_quirks = {
-	.max_read_len = 255,
-};
-
 static const struct i2c_adapter xiic_adapter = {
 	.owner = THIS_MODULE,
 	.class = I2C_CLASS_DEPRECATED,
 	.algo = &xiic_algorithm,
-	.quirks = &xiic_quirks,
 };
+
+static const struct xiic_version_data xiic_2_00 = {
+	.quirks = DYNAMIC_MODE_READ_BROKEN_BIT,
+};
+
+#if defined(CONFIG_OF)
+static const struct of_device_id xiic_of_match[] = {
+	{ .compatible = "xlnx,xps-iic-2.00.a", .data = &xiic_2_00 },
+	{ .compatible = "xlnx,axi-iic-2.1", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, xiic_of_match);
+#endif
 
 static int xiic_i2c_probe(struct platform_device *pdev)
 {
 	struct xiic_i2c *i2c;
 	struct xiic_i2c_platform_data *pdata;
+	const struct of_device_id *match;
 	struct resource *res;
 	int ret, irq;
 	u8 i;
···
 	i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
 	if (!i2c)
 		return -ENOMEM;
+
+	match = of_match_node(xiic_of_match, pdev->dev.of_node);
+	if (match && match->data) {
+		const struct xiic_version_data *data = match->data;
+
+		i2c->quirks = data->quirks;
+	}
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	i2c->base = devm_ioremap_resource(&pdev->dev, res);
···
 	pm_runtime_use_autosuspend(i2c->dev);
 	pm_runtime_set_active(i2c->dev);
 	pm_runtime_enable(i2c->dev);
+
+	/* SCL frequency configuration */
+	i2c->input_clk = clk_get_rate(i2c->clk);
+	ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
+				   &i2c->i2c_clk);
+	/* If clock-frequency not specified in DT, do not configure in SW */
+	if (ret || i2c->i2c_clk > I2C_MAX_FAST_MODE_PLUS_FREQ)
+		i2c->i2c_clk = 0;
+
 	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 					xiic_process, IRQF_ONESHOT,
 					pdev->name, i2c);
···
 			i2c_new_client_device(&i2c->adap, pdata->devices + i);
 	}
 
+	dev_dbg(&pdev->dev, "mmio %08lx irq %d scl clock frequency %d\n",
+		(unsigned long)res->start, irq, i2c->i2c_clk);
+
 	return 0;
 
 err_clk_dis:
···
 
 	return 0;
 }
-
-#if defined(CONFIG_OF)
-static const struct of_device_id xiic_of_match[] = {
-	{ .compatible = "xlnx,xps-iic-2.00.a", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, xiic_of_match);
-#endif
 
 static int __maybe_unused xiic_i2c_runtime_suspend(struct device *dev)
 {

drivers/i2c/i2c-core-base.c

···
 #include <linux/of.h>
 #include <linux/of_irq.h>
 #include <linux/pinctrl/consumer.h>
+#include <linux/pinctrl/devinfo.h>
 #include <linux/pm_domain.h>
 #include <linux/pm_runtime.h>
 #include <linux/pm_wakeirq.h>
···
 {
 	struct i2c_bus_recovery_info *bri = adap->bus_recovery_info;
 	struct device *dev = &adap->dev;
-	struct pinctrl *p = bri->pinctrl;
+	struct pinctrl *p = bri->pinctrl ?: dev_pinctrl(dev->parent);
+
+	bri->pinctrl = p;
 
 	/*
 	 * we can't change states without pinctrl, so remove the states if

drivers/i2c/i2c-dev.c

···
 	int res;
 
 	if (dev->type != &i2c_adapter_type)
-		return 0;
+		return NOTIFY_DONE;
 	adap = to_i2c_adapter(dev);
 
 	i2c_dev = get_free_i2c_dev(adap);
 	if (IS_ERR(i2c_dev))
-		return PTR_ERR(i2c_dev);
+		return NOTIFY_DONE;
 
 	cdev_init(&i2c_dev->cdev, &i2cdev_fops);
 	i2c_dev->cdev.owner = THIS_MODULE;
···
 		goto err_put_i2c_dev;
 
 	pr_debug("adapter [%s] registered as minor %d\n", adap->name, adap->nr);
-	return 0;
+	return NOTIFY_OK;
 
 err_put_i2c_dev:
 	put_i2c_dev(i2c_dev, false);
-	return res;
+	return NOTIFY_DONE;
 }
 
 static int i2cdev_detach_adapter(struct device *dev, void *dummy)
···
 	struct i2c_dev *i2c_dev;
 
 	if (dev->type != &i2c_adapter_type)
-		return 0;
+		return NOTIFY_DONE;
 	adap = to_i2c_adapter(dev);
 
 	i2c_dev = i2c_dev_get_by_minor(adap->nr);
 	if (!i2c_dev) /* attach_adapter must have failed */
-		return 0;
+		return NOTIFY_DONE;
 
 	put_i2c_dev(i2c_dev, true);
 
 	pr_debug("adapter [%s] unregistered\n", adap->name);
-	return 0;
+	return NOTIFY_OK;
 }
 
 static int i2cdev_notifier_call(struct notifier_block *nb, unsigned long action,
···
 		return i2cdev_detach_adapter(dev, NULL);
 	}
 
-	return 0;
+	return NOTIFY_DONE;
 }
 
 static struct notifier_block i2cdev_notifier = {

include/linux/pinctrl/devinfo.h

···
 
 #ifdef CONFIG_PINCTRL
 
+#include <linux/device.h>
+
 /* The device core acts as a consumer toward pinctrl */
 #include <linux/pinctrl/consumer.h>
 
···
 extern int pinctrl_bind_pins(struct device *dev);
 extern int pinctrl_init_done(struct device *dev);
 
+static inline struct pinctrl *dev_pinctrl(struct device *dev)
+{
+	if (!dev->pins)
+		return NULL;
+
+	return dev->pins->p;
+}
+
 #else
 
 /* Stubs if we're not using pinctrl */
···
 static inline int pinctrl_init_done(struct device *dev)
 {
 	return 0;
+}
+
+static inline struct pinctrl *dev_pinctrl(struct device *dev)
+{
+	return NULL;
 }
 
 #endif /* CONFIG_PINCTRL */

include/linux/platform_data/i2c-gpio.h

···
  *	isn't actively driven high when setting the output value high.
  *	gpio_get_value() must return the actual pin state even if the
  *	pin is configured as an output.
+ * @sda_is_output_only: SDA output drivers can't be turned off.
+ *	This is for clients that can only read SDA/SCL.
+ * @sda_has_no_pullup: SDA is used in a non-compliant way and has no pull-up.
+ *	Therefore disable open-drain.
  * @scl_is_open_drain: SCL is set up as open drain. Same requirements
  *	as for sda_is_open_drain apply.
  * @scl_is_output_only: SCL output drivers cannot be turned off.
+ * @scl_has_no_pullup: SCL is used in a non-compliant way and has no pull-up.
+ *	Therefore disable open-drain.
  */
 struct i2c_gpio_platform_data {
 	int		udelay;
 	int		timeout;
 	unsigned int	sda_is_open_drain:1;
+	unsigned int	sda_is_output_only:1;
+	unsigned int	sda_has_no_pullup:1;
 	unsigned int	scl_is_open_drain:1;
 	unsigned int	scl_is_output_only:1;
+	unsigned int	scl_has_no_pullup:1;
 };
 
 #endif /* _LINUX_I2C_GPIO_H */