Merge tag 'leds-next-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/leds

Pull LED updates from Lee Jones:

- pca955x: Add HW blink support, utilizing PWM0. It supports one
frequency across all blinking LEDs and falls back to software blink
if different frequencies are requested.

- trigger: netdev: Allow configuring LED blink interval via .blink_set
even when HW offload (.hw_control) is enabled.

- led-core: Fix a race condition where a quick LED_OFF followed by
another brightness set could leave the LED off incorrectly,
especially noticeable after the introduction of the ordered
workqueue.

- qcom-lpg: Add support for 6-bit PWM resolution alongside the existing
9-bit support.

- qcom-lpg: Fix PWM value capping to respect the selected resolution
(6-bit or 9-bit) for normal PWMs.

- qcom-lpg: Fix PWM value capping to respect the selected resolution
for Hi-Res PWMs.

- qcom-lpg: Fix calculation of the best period for Hi-Res PWMs to
prevent requested duty cycles from exceeding the maximum allowed by
the selected resolution.

- st1202: Add a check for the error code returned by devm_mutex_init().

- pwm-multicolor: Add a check for the return value of
fwnode_property_read_u32().

- st1202: Ensure hardware initialization (st1202_setup) happens before
DT node processing (st1202_dt_init).

- Kconfig: leds-st1202: Add select LEDS_TRIGGER_PATTERN as it's
required by the driver.

- lp8860: Drop unneeded explicit assignment to REGCACHE_NONE.

- pca955x: Refactor code with helper functions and rename some
functions/variables for clarity.

- pca955x: Pass driver data pointers instead of the I2C client to
helper functions.

- pca955x: Optimize probe LED selection logic to reduce I2C operations.

- pca955x: Revert the removal of pca95xx_num_led_regs() (renaming it to
pca955x_num_led_regs) as it's needed for HW blink support.

- st1202: Refactor st1202_led_set() to use the !! operator for boolean
conversion.

- st1202: Minor spacing and proofreading edits in comments.

- Directory Rename: Rename the drivers/leds/simple directory to
drivers/leds/simatic as the drivers within are not simple.

- mlxcpld: Remove unused include of acpi.h.

- nic78bx: Tidy up the ACPI ID table (remove ACPI_PTR, use
mod_devicetable.h, remove explicit driver_data initializer).

- tlc591xx: Convert text binding to YAML format, add child node
constraints, and fix typos/formatting in the example.

- qcom-lpg: Document the qcom,pm8937-pwm compatible string as a
fallback for qcom,pm8916-pwm.

* tag 'leds-next-6.15' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/leds: (23 commits)
leds: nic78bx: Tidy up ACPI ID table
leds: mlxcpld: Remove unused ACPI header inclusion
leds: rgb: leds-qcom-lpg: Fix calculation of best period Hi-Res PWMs
leds: rgb: leds-qcom-lpg: Fix pwm resolution max for Hi-Res PWMs
leds: rgb: leds-qcom-lpg: Fix pwm resolution max for normal PWMs
leds: Rename simple directory to simatic
leds: Kconfig: leds-st1202: Add select for required LEDS_TRIGGER_PATTERN
leds: leds-st1202: Spacing and proofreading editing
leds: leds-st1202: Initialize hardware before DT node child operations
leds: pwm-multicolor: Add check for fwnode_property_read_u32
leds: rgb: leds-qcom-lpg: Add support for 6-bit PWM resolution
leds: Fix LED_OFF brightness race
Revert "leds-pca955x: Remove the unused function pca95xx_num_led_regs()"
leds: st1202: Refactor st1202_led_set() to use !! operator for boolean conversion
dt-bindings: leds: qcom-lpg: Document PM8937 PWM compatible
leds: pca955x: Add HW blink support
leds: pca955x: Optimize probe LED selection
leds: pca955x: Use pointers to driver data rather than I2C client
leds: pca955x: Refactor with helper functions and renaming
dt-bindings: leds: Convert leds-tlc591xx.txt to yaml format
...

Documentation/devicetree/bindings/leds/leds-qcom-lpg.yaml

···
           - enum:
               - qcom,pm8550-pwm
           - const: qcom,pm8350c-pwm
+      - items:
+          - enum:
+              - qcom,pm8937-pwm
+          - const: qcom,pm8916-pwm
 
   "#pwm-cells":
     const: 2

Documentation/devicetree/bindings/leds/leds-tlc591xx.txt

···
-LEDs connected to tlc59116 or tlc59108
-
-Required properties
-- compatible: should be "ti,tlc59116" or "ti,tlc59108"
-- #address-cells: must be 1
-- #size-cells: must be 0
-- reg: typically 0x68
-
-Each led is represented as a sub-node of the ti,tlc59116.
-See Documentation/devicetree/bindings/leds/common.txt
-
-LED sub-node properties:
-- reg: number of LED line, 0 to 15 or 0 to 7
-- label: (optional) name of LED
-- linux,default-trigger : (optional)
-
-Examples:
-
-tlc59116@68 {
-	#address-cells = <1>;
-	#size-cells = <0>;
-	compatible = "ti,tlc59116";
-	reg = <0x68>;
-
-	wan@0 {
-		label = "wrt1900ac:amber:wan";
-		reg = <0x0>;
-	};
-
-	2g@2 {
-		label = "wrt1900ac:white:2g";
-		reg = <0x2>;
-	};
-
-	alive@9 {
-		label = "wrt1900ac:green:alive";
-		reg = <0x9>;
-		linux,default_trigger = "heartbeat";
-	};
-};

Documentation/devicetree/bindings/leds/ti,tlc59116.yaml

···
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/ti,tlc59116.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LEDs connected to tlc59116 or tlc59108
+
+maintainers:
+  - Andrew Lunn <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - ti,tlc59108
+      - ti,tlc59116
+
+  reg:
+    maxItems: 1
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 0
+
+patternProperties:
+  "^led@[0-9a-f]$":
+    type: object
+    $ref: common.yaml#
+    properties:
+      reg:
+        items:
+          minimum: 0
+          maximum: 15
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: ti,tlc59108
+    then:
+      patternProperties:
+        "^led@[0-9a-f]$":
+          properties:
+            reg:
+              items:
+                maximum: 7
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        led-controller@68 {
+            compatible = "ti,tlc59116";
+            reg = <0x68>;
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            led@0 {
+                reg = <0x0>;
+                label = "wrt1900ac:amber:wan";
+            };
+
+            led@2 {
+                reg = <0x2>;
+                label = "wrt1900ac:white:2g";
+            };
+
+            led@9 {
+                reg = <0x9>;
+                label = "wrt1900ac:green:alive";
+                linux,default-trigger = "heartbeat";
+            };
+        };
+    };
+

drivers/leds/Kconfig

···
 config LEDS_NIC78BX
 	tristate "LED support for NI PXI NIC78bx devices"
 	depends on LEDS_CLASS
-	depends on X86 && ACPI
+	depends on HAS_IOPORT
+	depends on X86 || COMPILE_TEST
 	help
 	  This option enables support for the User1 and User2 LEDs on NI
 	  PXI NIC78bx devices.
···
 	depends on I2C
 	depends on OF
 	select LEDS_TRIGGERS
+	select LEDS_TRIGGER_PATTERN
 	help
 	  Say Y to enable support for LEDs connected to LED1202
 	  LED driver chips accessed via the I2C bus.
···
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 
-comment "Simple LED drivers"
-source "drivers/leds/simple/Kconfig"
+comment "Simatic LED drivers"
+source "drivers/leds/simatic/Kconfig"
 
 endif # NEW_LEDS

drivers/leds/Makefile

···
 # LED Blink
 obj-y					+= blink/
 
-# Simple LED drivers
-obj-y					+= simple/
+# Simatic LED drivers
+obj-y					+= simatic/

drivers/leds/led-core.c

···
 	 * before this work item runs once. To make sure this works properly
 	 * handle LED_SET_BRIGHTNESS_OFF first.
 	 */
-	if (test_and_clear_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags))
+	if (test_and_clear_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags)) {
 		set_brightness_delayed_set_brightness(led_cdev, LED_OFF);
+		/*
+		 * The consecutives led_set_brightness(LED_OFF),
+		 * led_set_brightness(LED_FULL) could have been executed out of
+		 * order (LED_FULL first), if the work_flags has been set
+		 * between LED_SET_BRIGHTNESS_OFF and LED_SET_BRIGHTNESS of this
+		 * work. To avoid ending with the LED turned off, turn the LED
+		 * on again.
+		 */
+		if (led_cdev->delayed_set_value != LED_OFF)
+			set_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags);
+	}
 
 	if (test_and_clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags))
 		set_brightness_delayed_set_brightness(led_cdev, led_cdev->delayed_set_value);
···
 	 * change is done immediately afterwards (before the work runs),
 	 * it uses a separate work_flag.
 	 */
-	if (value) {
-		led_cdev->delayed_set_value = value;
+	led_cdev->delayed_set_value = value;
+	/* Ensure delayed_set_value is seen before work_flags modification */
+	smp_mb__before_atomic();
+
+	if (value)
 		set_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags);
-	} else {
+	else {
 		clear_bit(LED_SET_BRIGHTNESS, &led_cdev->work_flags);
 		clear_bit(LED_SET_BLINK, &led_cdev->work_flags);
 		set_bit(LED_SET_BRIGHTNESS_OFF, &led_cdev->work_flags);

drivers/leds/leds-lp8860.c

···
 	.max_register = LP8860_EEPROM_UNLOCK,
 	.reg_defaults = lp8860_reg_defs,
 	.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
-	.cache_type = REGCACHE_NONE,
 };
 
 static const struct reg_default lp8860_eeprom_defs[] = {
···
 	.max_register = LP8860_EEPROM_REG_24,
 	.reg_defaults = lp8860_eeprom_defs,
 	.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
-	.cache_type = REGCACHE_NONE,
 };
 
 static int lp8860_probe(struct i2c_client *client)

drivers/leds/leds-mlxcpld.c

···
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <linux/acpi.h>
 #include <linux/device.h>
 #include <linux/dmi.h>
 #include <linux/hwmon.h>

drivers/leds/leds-nic78bx.c

···
  * Copyright (C) 2016 National Instruments Corp.
  */
 
-#include <linux/acpi.h>
+#include <linux/array_size.h>
+#include <linux/bits.h>
+#include <linux/container_of.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
 #include <linux/leds.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/spinlock.h>
+#include <linux/types.h>
 
 #define NIC78BX_USER1_LED_MASK		0x3
 #define NIC78BX_USER1_GREEN_LED		BIT(0)
···
 }
 
 static const struct acpi_device_id led_device_ids[] = {
-	{"NIC78B3", 0},
-	{"", 0},
+	{ "NIC78B3" },
+	{ }
 };
 MODULE_DEVICE_TABLE(acpi, led_device_ids);
 
···
 	.probe = nic78bx_probe,
 	.driver = {
 		.name = KBUILD_MODNAME,
-		.acpi_match_table = ACPI_PTR(led_device_ids),
+		.acpi_match_table = led_device_ids,
 	},
 };
 

drivers/leds/leds-pca955x.c

···
 #define PCA955X_GPIO_HIGH	LED_OFF
 #define PCA955X_GPIO_LOW	LED_FULL
 
+#define PCA955X_BLINK_DEFAULT_MS	1000
+
 enum pca955x_type {
 	pca9550,
 	pca9551,
···
 	int			bits;
 	u8			slv_addr;	/* 7-bit slave address mask */
 	int			slv_addr_shift;	/* Number of bits to ignore */
+	int			blink_div;	/* PSC divider */
 };
 
 static const struct pca955x_chipdef pca955x_chipdefs[] = {
···
 		.bits		= 2,
 		.slv_addr	= /* 110000x */ 0x60,
 		.slv_addr_shift	= 1,
+		.blink_div	= 44,
 	},
 	[pca9551] = {
 		.bits		= 8,
 		.slv_addr	= /* 1100xxx */ 0x60,
 		.slv_addr_shift	= 3,
+		.blink_div	= 38,
 	},
 	[pca9552] = {
 		.bits		= 16,
 		.slv_addr	= /* 1100xxx */ 0x60,
 		.slv_addr_shift	= 3,
+		.blink_div	= 44,
 	},
 	[ibm_pca9552] = {
 		.bits		= 16,
 		.slv_addr	= /* 0110xxx */ 0x30,
 		.slv_addr_shift	= 3,
+		.blink_div	= 44,
 	},
 	[pca9553] = {
 		.bits		= 4,
 		.slv_addr	= /* 110001x */ 0x62,
 		.slv_addr_shift	= 1,
+		.blink_div	= 44,
 	},
 };
 
···
 	struct pca955x_led *leds;
 	const struct pca955x_chipdef	*chipdef;
 	struct i2c_client	*client;
+	unsigned long active_blink;
 	unsigned long active_pins;
+	unsigned long blink_period;
 #ifdef CONFIG_LEDS_PCA955X_GPIO
 	struct gpio_chip gpio;
 #endif
···
 	struct fwnode_handle	*fwnode;
 };
 
+#define led_to_pca955x(l)	container_of(l, struct pca955x_led, led_cdev)
+
 struct pca955x_platform_data {
 	struct pca955x_led	*leds;
 	int			num_leds;
 };
 
 /* 8 bits per input register */
-static inline int pca95xx_num_input_regs(int bits)
+static inline int pca955x_num_input_regs(int bits)
 {
 	return (bits + 7) / 8;
+}
+
+/* 4 bits per LED selector register */
+static inline int pca955x_num_led_regs(int bits)
+{
+	return (bits + 3)  / 4;
 }
 
 /*
···
 		((state & 0x3) << (led_num << 1));
 }
 
+static inline int pca955x_ledstate(u8 ls, int led_num)
+{
+	return (ls >> (led_num << 1)) & 0x3;
+}
+
 /*
  * Write to frequency prescaler register, used to program the
- * period of the PWM output.  period = (PSCx + 1) / 38
+ * period of the PWM output.  period = (PSCx + 1) / coeff
+ * Where for pca9551 chips coeff = 38 and for all other chips coeff = 44
  */
-static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
+static int pca955x_write_psc(struct pca955x *pca955x, int n, u8 val)
 {
-	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n);
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + (2 * n);
 	int ret;
 
-	ret = i2c_smbus_write_byte_data(client, cmd, val);
+	ret = i2c_smbus_write_byte_data(pca955x->client, cmd, val);
 	if (ret < 0)
-		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
-			__func__, n, val, ret);
+		dev_err(&pca955x->client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", __func__, n,
+			val, ret);
 	return ret;
 }
 
···
  *
  * Duty cycle is (256 - PWMx) / 256
  */
-static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
+static int pca955x_write_pwm(struct pca955x *pca955x, int n, u8 val)
 {
-	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
 	int ret;
 
-	ret = i2c_smbus_write_byte_data(client, cmd, val);
+	ret = i2c_smbus_write_byte_data(pca955x->client, cmd, val);
 	if (ret < 0)
-		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
-			__func__, n, val, ret);
+		dev_err(&pca955x->client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", __func__, n,
+			val, ret);
 	return ret;
 }
 
···
  * Write to LED selector register, which determines the source that
  * drives the LED output.
  */
-static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
+static int pca955x_write_ls(struct pca955x *pca955x, int n, u8 val)
 {
-	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 4 + n;
 	int ret;
 
-	ret = i2c_smbus_write_byte_data(client, cmd, val);
+	ret = i2c_smbus_write_byte_data(pca955x->client, cmd, val);
 	if (ret < 0)
-		dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",
-			__func__, n, val, ret);
+		dev_err(&pca955x->client->dev, "%s: reg 0x%x, val 0x%x, err %d\n", __func__, n,
+			val, ret);
 	return ret;
 }
 
···
  * Read the LED selector register, which determines the source that
  * drives the LED output.
  */
-static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
+static int pca955x_read_ls(struct pca955x *pca955x, int n, u8 *val)
 {
-	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 4 + n;
 	int ret;
 
-	ret = i2c_smbus_read_byte_data(client, cmd);
+	ret = i2c_smbus_read_byte_data(pca955x->client, cmd);
 	if (ret < 0) {
-		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
-			__func__, n, ret);
+		dev_err(&pca955x->client->dev, "%s: reg 0x%x, err %d\n", __func__, n, ret);
 		return ret;
 	}
 	*val = (u8)ret;
 	return 0;
 }
 
-static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
+static int pca955x_read_pwm(struct pca955x *pca955x, int n, u8 *val)
 {
-	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
 	int ret;
 
-	ret = i2c_smbus_read_byte_data(client, cmd);
+	ret = i2c_smbus_read_byte_data(pca955x->client, cmd);
 	if (ret < 0) {
-		dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
-			__func__, n, ret);
+		dev_err(&pca955x->client->dev, "%s: reg 0x%x, err %d\n", __func__, n, ret);
+		return ret;
+	}
+	*val = (u8)ret;
+	return 0;
+}
+
+static int pca955x_read_psc(struct pca955x *pca955x, int n, u8 *val)
+{
+	int ret;
+	u8 cmd;
+
+	cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + (2 * n);
+	ret = i2c_smbus_read_byte_data(pca955x->client, cmd);
+	if (ret < 0) {
+		dev_err(&pca955x->client->dev, "%s: reg 0x%x, err %d\n", __func__, n, ret);
 		return ret;
 	}
 	*val = (u8)ret;
···
 
 static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
 {
-	struct pca955x_led *pca955x_led = container_of(led_cdev,
-						       struct pca955x_led,
-						       led_cdev);
+	struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev);
 	struct pca955x *pca955x = pca955x_led->pca955x;
 	u8 ls, pwm;
 	int ret;
 
-	ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls);
+	ret = pca955x_read_ls(pca955x, pca955x_led->led_num / 4, &ls);
 	if (ret)
 		return ret;
 
-	ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3;
-	switch (ls) {
+	switch (pca955x_ledstate(ls, pca955x_led->led_num % 4)) {
 	case PCA955X_LS_LED_ON:
+	case PCA955X_LS_BLINK0:
 		ret = LED_FULL;
 		break;
 	case PCA955X_LS_LED_OFF:
 		ret = LED_OFF;
 		break;
-	case PCA955X_LS_BLINK0:
-		ret = LED_HALF;
-		break;
 	case PCA955X_LS_BLINK1:
-		ret = pca955x_read_pwm(pca955x->client, 1, &pwm);
+		ret = pca955x_read_pwm(pca955x, 1, &pwm);
 		if (ret)
 			return ret;
 		ret = 255 - pwm;
···
 static int pca955x_led_set(struct led_classdev *led_cdev,
 			    enum led_brightness value)
 {
-	struct pca955x_led *pca955x_led;
-	struct pca955x *pca955x;
+	struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev);
+	struct pca955x *pca955x = pca955x_led->pca955x;
+	int reg = pca955x_led->led_num / 4;
+	int bit = pca955x_led->led_num % 4;
 	u8 ls;
-	int chip_ls;	/* which LSx to use (0-3 potentially) */
-	int ls_led;	/* which set of bits within LSx to use (0-3) */
 	int ret;
-
-	pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
-	pca955x = pca955x_led->pca955x;
-
-	chip_ls = pca955x_led->led_num / 4;
-	ls_led = pca955x_led->led_num % 4;
 
 	mutex_lock(&pca955x->lock);
 
-	ret = pca955x_read_ls(pca955x->client, chip_ls, &ls);
+	ret = pca955x_read_ls(pca955x, reg, &ls);
 	if (ret)
 		goto out;
 
-	switch (value) {
-	case LED_FULL:
-		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
-		break;
-	case LED_OFF:
-		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
-		break;
-	case LED_HALF:
-		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
-		break;
-	default:
-		/*
-		 * Use PWM1 for all other values.  This has the unwanted
-		 * side effect of making all LEDs on the chip share the
-		 * same brightness level if set to a value other than
-		 * OFF, HALF, or FULL.  But, this is probably better than
-		 * just turning off for all other values.
-		 */
-		ret = pca955x_write_pwm(pca955x->client, 1, 255 - value);
-		if (ret)
+	if (test_bit(pca955x_led->led_num, &pca955x->active_blink)) {
+		if (value == LED_OFF) {
+			clear_bit(pca955x_led->led_num, &pca955x->active_blink);
+			ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_OFF);
+		} else {
+			/* No variable brightness for blinking LEDs */
 			goto out;
-		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
-		break;
+		}
+	} else {
+		switch (value) {
+		case LED_FULL:
+			ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_ON);
+			break;
+		case LED_OFF:
+			ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_OFF);
+			break;
+		default:
+			/*
+			 * Use PWM1 for all other values. This has the unwanted
+			 * side effect of making all LEDs on the chip share the
+			 * same brightness level if set to a value other than
+			 * OFF or FULL. But, this is probably better than just
+			 * turning off for all other values.
+			 */
+			ret = pca955x_write_pwm(pca955x, 1, 255 - value);
+			if (ret)
+				goto out;
+			ls = pca955x_ledsel(ls, bit, PCA955X_LS_BLINK1);
+			break;
+		}
 	}
 
-	ret = pca955x_write_ls(pca955x->client, chip_ls, ls);
+	ret = pca955x_write_ls(pca955x, reg, ls);
+
+out:
+	mutex_unlock(&pca955x->lock);
+
+	return ret;
+}
+
+static u8 pca955x_period_to_psc(struct pca955x *pca955x, unsigned long period)
+{
+	/* psc register value = (blink period * coeff) - 1 */
+	period *= pca955x->chipdef->blink_div;
+	period /= MSEC_PER_SEC;
+	period -= 1;
+
+	return period;
+}
+
+static unsigned long pca955x_psc_to_period(struct pca955x *pca955x, u8 psc)
+{
+	unsigned long period = psc;
+
+	/* blink period = (psc register value + 1) / coeff */
+	period += 1;
+	period *= MSEC_PER_SEC;
+	period /= pca955x->chipdef->blink_div;
+
+	return period;
+}
+
+static int pca955x_led_blink(struct led_classdev *led_cdev,
+			     unsigned long *delay_on, unsigned long *delay_off)
+{
+	struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev);
+	struct pca955x *pca955x = pca955x_led->pca955x;
+	unsigned long period = *delay_on + *delay_off;
+	int ret = 0;
+
+	mutex_lock(&pca955x->lock);
+
+	if (period) {
+		if (*delay_on != *delay_off) {
+			ret = -EINVAL;
+			goto out;
+		}
+
+		if (period < pca955x_psc_to_period(pca955x, 0) ||
+		    period > pca955x_psc_to_period(pca955x, 0xff)) {
+			ret = -EINVAL;
+			goto out;
+		}
+	} else {
+		period = pca955x->active_blink ? pca955x->blink_period :
+			PCA955X_BLINK_DEFAULT_MS;
+	}
+
+	if (!pca955x->active_blink ||
+	    pca955x->active_blink == BIT(pca955x_led->led_num) ||
+	    pca955x->blink_period == period) {
+		u8 psc = pca955x_period_to_psc(pca955x, period);
+
+		if (!test_and_set_bit(pca955x_led->led_num,
+				      &pca955x->active_blink)) {
+			u8 ls;
+			int reg = pca955x_led->led_num / 4;
+			int bit = pca955x_led->led_num % 4;
+
+			ret = pca955x_read_ls(pca955x, reg, &ls);
+			if (ret)
+				goto out;
+
+			ls = pca955x_ledsel(ls, bit, PCA955X_LS_BLINK0);
+			ret = pca955x_write_ls(pca955x, reg, ls);
+			if (ret)
+				goto out;
+
+			/*
+			 * Force 50% duty cycle to maintain the specified
+			 * blink rate.
+			 */
+			ret = pca955x_write_pwm(pca955x, 0, 128);
+			if (ret)
+				goto out;
+		}
+
+		if (pca955x->blink_period != period) {
+			pca955x->blink_period = period;
+			ret = pca955x_write_psc(pca955x, 0, psc);
+			if (ret)
+				goto out;
+		}
+
+		period = pca955x_psc_to_period(pca955x, psc);
+		period /= 2;
+		*delay_on = period;
+		*delay_off = period;
+	} else {
+		ret = -EBUSY;
+	}
 
 out:
 	mutex_unlock(&pca955x->lock);
···
 	struct led_classdev *led;
 	struct led_init_data init_data;
 	struct i2c_adapter *adapter;
-	int i, err;
+	int i, bit, err, nls, reg;
+	u8 ls1[4];
+	u8 ls2[4];
 	struct pca955x_platform_data *pdata;
+	u8 psc0;
+	bool keep_psc0 = false;
 	bool set_default_label = false;
-	bool keep_pwm = false;
 	char default_label[8];
 
 	chip = i2c_get_match_data(client);
···
 	mutex_init(&pca955x->lock);
 	pca955x->client = client;
 	pca955x->chipdef = chip;
+	pca955x->blink_period = PCA955X_BLINK_DEFAULT_MS;
 
 	init_data.devname_mandatory = false;
 	init_data.devicename = "pca955x";
+
+	nls = pca955x_num_led_regs(chip->bits);
+	/* Use auto-increment feature to read all the LED selectors at once. */
+	err = i2c_smbus_read_i2c_block_data(client,
+					    0x10 | (pca955x_num_input_regs(chip->bits) + 4), nls,
+					    ls1);
+	if (err < 0)
+		return err;
+
+	for (i = 0; i < nls; i++)
+		ls2[i] = ls1[i];
 
 	for (i = 0; i < chip->bits; i++) {
 		pca955x_led = &pca955x->leds[i];
···
 		case PCA955X_TYPE_GPIO:
 			break;
 		case PCA955X_TYPE_LED:
+			bit = i % 4;
+			reg = i / 4;
 			led = &pca955x_led->led_cdev;
 			led->brightness_set_blocking = pca955x_led_set;
 			led->brightness_get = pca955x_led_get;
+			led->blink_set = pca955x_led_blink;
 
-			if (pdata->leds[i].default_state == LEDS_DEFSTATE_OFF) {
-				err = pca955x_led_set(led, LED_OFF);
-				if (err)
-					return err;
-			} else if (pdata->leds[i].default_state == LEDS_DEFSTATE_ON) {
-				err = pca955x_led_set(led, LED_FULL);
-				if (err)
-					return err;
+			if (pdata->leds[i].default_state == LEDS_DEFSTATE_OFF)
+				ls2[reg] = pca955x_ledsel(ls2[reg], bit, PCA955X_LS_LED_OFF);
+			else if (pdata->leds[i].default_state == LEDS_DEFSTATE_ON)
+				ls2[reg] = pca955x_ledsel(ls2[reg], bit, PCA955X_LS_LED_ON);
+			else if (pca955x_ledstate(ls2[reg], bit) == PCA955X_LS_BLINK0) {
+				keep_psc0 = true;
+				set_bit(i, &pca955x->active_blink);
 			}
 
 			init_data.fwnode = pdata->leds[i].fwnode;
···
 				return err;
 
 			set_bit(i, &pca955x->active_pins);
-
-			/*
-			 * For default-state == "keep", let the core update the
-			 * brightness from the hardware, then check the
-			 * brightness to see if it's using PWM1. If so, PWM1
-			 * should not be written below.
-			 */
-			if (pdata->leds[i].default_state == LEDS_DEFSTATE_KEEP) {
-				if (led->brightness != LED_FULL &&
-				    led->brightness != LED_OFF &&
-				    led->brightness != LED_HALF)
-					keep_pwm = true;
-			}
 		}
 	}
 
-	/* PWM0 is used for half brightness or 50% duty cycle */
-	err = pca955x_write_pwm(client, 0, 255 - LED_HALF);
-	if (err)
-		return err;
-
-	if (!keep_pwm) {
-		/* PWM1 is used for variable brightness, default to OFF */
-		err = pca955x_write_pwm(client, 1, 0);
-		if (err)
-			return err;
+	for (i = 0; i < nls; i++) {
+		if (ls1[i] != ls2[i]) {
+			err = pca955x_write_ls(pca955x, i, ls2[i]);
+			if (err)
+				return err;
+		}
 	}
 
-	/* Set to fast frequency so we do not see flashing */
-	err = pca955x_write_psc(client, 0, 0);
+	if (keep_psc0) {
+		err = pca955x_read_psc(pca955x, 0, &psc0);
+	} else {
+		psc0 = pca955x_period_to_psc(pca955x, pca955x->blink_period);
+		err = pca955x_write_psc(pca955x, 0, psc0);
+	}
+
 	if (err)
 		return err;
-	err = pca955x_write_psc(client, 1, 0);
+
+	pca955x->blink_period = pca955x_psc_to_period(pca955x, psc0);
+
+	/* Set PWM1 to fast frequency so we do not see flashing */
+	err = pca955x_write_psc(pca955x, 1, 0);
 	if (err)
 		return err;
 

drivers/leds/leds-st1202.c

···
 	value_h = (u8)(value >> 8);
 
 	/*
-	 *  Datasheet: Register address low = 1Eh + 2*(xh) + 18h*(yh),
-	 *  where x is the channel number (led number) in hexadecimal (x = 00h .. 0Bh)
-	 *  and y is the pattern number in hexadecimal (y = 00h .. 07h)
+	 * Datasheet: Register address low = 1Eh + 2*(xh) + 18h*(yh),
+	 * where x is the channel number (led number) in hexadecimal (x = 00h .. 0Bh)
+	 * and y is the pattern number in hexadecimal (y = 00h .. 07h)
 	 */
 	ret = st1202_write_reg(chip, (ST1202_PATTERN_PWM + (led_num * 2) + 0x18 * pattern),
 				value_l);
···
 static int st1202_led_set(struct led_classdev *ldev, enum led_brightness value)
 {
 	struct st1202_led *led = cdev_to_st1202_led(ldev);
-	struct st1202_chip *chip = led->chip;
 
-	return st1202_channel_set(chip, led->led_num, value == LED_OFF ? false : true);
+	return st1202_channel_set(led->chip, led->led_num, !!value);
 }
 
 static int st1202_led_pattern_clear(struct led_classdev *ldev)
···
 	guard(mutex)(&chip->lock);
 
 	/*
-	 * Once the supply voltage is applied, the LED1202 executes some internal checks,
-	 * afterwords it stops the oscillator and puts the internal LDO in quiescent mode.
+	 * Once the supply voltage is applied, the LED1202 executes some internal checks.
+	 * Afterwards, it stops the oscillator and puts the internal LDO in quiescent mode.
 	 * To start the device, EN bit must be set inside the “Device Enable” register at
 	 * address 01h. As soon as EN is set, the LED1202 loads the adjustment parameters
 	 * from the internal non-volatile memory and performs an auto-calibration procedure
···
 	if (!chip)
 		return -ENOMEM;
 
-	devm_mutex_init(&client->dev, &chip->lock);
+	ret = devm_mutex_init(&client->dev, &chip->lock);
+	if (ret < 0)
+		return ret;
 	chip->client = client;
 
-	ret = st1202_dt_init(chip);
+	ret = st1202_setup(chip);
 	if (ret < 0)
 		return ret;
 
-	ret = st1202_setup(chip);
+	ret = st1202_dt_init(chip);
 	if (ret < 0)
 		return ret;
 

drivers/leds/rgb/leds-pwm-multicolor.c

···
 
 	/* init the multicolor's LED class device */
 	cdev = &priv->mc_cdev.led_cdev;
-	fwnode_property_read_u32(mcnode, "max-brightness",
+	ret = fwnode_property_read_u32(mcnode, "max-brightness",
 				 &cdev->max_brightness);
+	if (ret)
+		goto release_mcnode;
+
 	cdev->flags = LED_CORE_SUSPENDRESUME;
 	cdev->brightness_set_blocking = led_pwm_mc_set;
 

drivers/leds/rgb/leds-qcom-lpg.c

···
 #define LPG_PATTERN_CONFIG_REG	0x40
 #define LPG_SIZE_CLK_REG	0x41
 #define  PWM_CLK_SELECT_MASK	GENMASK(1, 0)
+#define  PWM_SIZE_SELECT_MASK	BIT(2)
 #define  PWM_CLK_SELECT_HI_RES_MASK	GENMASK(2, 0)
 #define  PWM_SIZE_HI_RES_MASK	GENMASK(6, 4)
 #define LPG_PREDIV_CLK_REG	0x42
···
 static const unsigned int lpg_clk_rates[] = {0, 1024, 32768, 19200000};
 static const unsigned int lpg_clk_rates_hi_res[] = {0, 1024, 32768, 19200000, 76800000};
 static const unsigned int lpg_pre_divs[] = {1, 3, 5, 6};
-static const unsigned int lpg_pwm_resolution[] =  {9};
-static const unsigned int lpg_pwm_resolution_hi_res[] =  {8, 9, 10, 11, 12, 13, 14, 15};
+static const unsigned int lpg_pwm_resolution[] = {6, 9};
+static const unsigned int lpg_pwm_resolution_hi_res[] = {8, 9, 10, 11, 12, 13, 14, 15};
 
 static int lpg_calc_freq(struct lpg_channel *chan, uint64_t period)
 {
···
 	 * period = --------------------------
 	 *                   refclk
 	 *
-	 * Resolution = 2^9 bits for PWM or
+	 * Resolution = 2^{6 or 9} bits for PWM or
 	 *              2^{8, 9, 10, 11, 12, 13, 14, 15} bits for high resolution PWM
 	 * pre_div = {1, 3, 5, 6} and
 	 * M = [0..7].
 	 *
-	 * This allows for periods between 27uS and 384s for PWM channels and periods between
+	 * This allows for periods between 3uS and 384s for PWM channels and periods between
 	 * 3uS and 24576s for high resolution PWMs.
 	 * The PWM framework wants a period of equal or lower length than requested,
 	 * reject anything below minimum period.
···
 		max_res = LPG_RESOLUTION_9BIT;
 	}
 
-	min_period = div64_u64((u64)NSEC_PER_SEC * (1 << pwm_resolution_arr[0]),
+	min_period = div64_u64((u64)NSEC_PER_SEC * ((1 << pwm_resolution_arr[0]) - 1),
 			       clk_rate_arr[clk_len - 1]);
 	if (period <= min_period)
 		return -EINVAL;
···
 	 */
 
 	for (i = 0; i < pwm_resolution_count; i++) {
-		resolution = 1 << pwm_resolution_arr[i];
+		resolution = (1 << pwm_resolution_arr[i]) - 1;
 		for (clk_sel = 1; clk_sel < clk_len; clk_sel++) {
 			u64 numerator = period * clk_rate_arr[clk_sel];
 
···
 	unsigned int clk_rate;
 
 	if (chan->subtype == LPG_SUBTYPE_HI_RES_PWM) {
-		max = LPG_RESOLUTION_15BIT - 1;
+		max = BIT(lpg_pwm_resolution_hi_res[chan->pwm_resolution_sel]) - 1;
 		clk_rate = lpg_clk_rates_hi_res[chan->clk_sel];
 	} else {
-		max = LPG_RESOLUTION_9BIT - 1;
+		max = BIT(lpg_pwm_resolution[chan->pwm_resolution_sel]) - 1;
 		clk_rate = lpg_clk_rates[chan->clk_sel];
 	}
 
···
 		val |= GENMASK(5, 4);
 		break;
 	case LPG_SUBTYPE_PWM:
-		val |= BIT(2);
+		val |= FIELD_PREP(PWM_SIZE_SELECT_MASK, chan->pwm_resolution_sel);
 		break;
 	case LPG_SUBTYPE_HI_RES_PWM:
 		val |= FIELD_PREP(PWM_SIZE_HI_RES_MASK, chan->pwm_resolution_sel);
···
 		resolution = lpg_pwm_resolution_hi_res[FIELD_GET(PWM_SIZE_HI_RES_MASK, val)];
 	} else {
 		refclk = lpg_clk_rates[FIELD_GET(PWM_CLK_SELECT_MASK, val)];
-		resolution = 9;
+		resolution = lpg_pwm_resolution[FIELD_GET(PWM_SIZE_SELECT_MASK, val)];
 	}
 
 	if (refclk) {
···
 		if (ret)
 			return ret;
 
-		state->period = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * (1 << resolution) *
+		state->period = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * ((1 << resolution) - 1) *
 						 pre_div * (1 << m), refclk);
 		state->duty_cycle = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC * pwm_value * pre_div * (1 << m), refclk);
 	} else {

drivers/leds/trigger/ledtrig-netdev.c

···
 	unsigned int last_activity;
 
 	unsigned long mode;
+	unsigned long blink_delay;
 	int link_speed;
 	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported_link_modes);
 	u8 duplex;
···
 	/* Already validated, hw control is possible with the requested mode */
 	if (trigger_data->hw_control) {
 		led_cdev->hw_control_set(led_cdev, trigger_data->mode);
+		if (led_cdev->blink_set) {
+			led_cdev->blink_set(led_cdev, &trigger_data->blink_delay,
+					    &trigger_data->blink_delay);
+		}
 
 		return;
 	}
···
 			      size_t size)
 {
 	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+	struct led_classdev *led_cdev = trigger_data->led_cdev;
 	unsigned long value;
 	int ret;
 
-	if (trigger_data->hw_control)
+	if (trigger_data->hw_control && !led_cdev->blink_set)
 		return -EINVAL;
 
 	ret = kstrtoul(buf, 0, &value);
···
 
 	/* impose some basic bounds on the timer interval */
 	if (value >= 5 && value <= 10000) {
-		cancel_delayed_work_sync(&trigger_data->work);
+		if (trigger_data->hw_control) {
+			trigger_data->blink_delay = value;
+		} else {
+			cancel_delayed_work_sync(&trigger_data->work);
 
-		atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
+			atomic_set(&trigger_data->interval, msecs_to_jiffies(value));
+		}
 		set_baseline_state(trigger_data);	/* resets timer */
 	}