Merge tag 'reset-for-5.6' of git://git.pengutronix.de/pza/linux into arm/drivers

Reset controller updates for v5.6

This tag adds support for the Nuvoton NPCM, Intel Gatway SoC, and
Broadcom BCM7216 RESCAL reset controllers, adds missing SCSSI reset
controls for newer Uniphier SoCs, aligns the program flow in the
devm_reset_controller_register, __devm_reset_control_get, and
devm_reset_control_array_get functions for better consistency,
and allows to build the Qcom AOSS reset driver as a module.

This is based on v5.5-rc3 because the core patch depends on commit
db23808615e2 ("reset: Do not register resource data for missing
resets").

* tag 'reset-for-5.6' of git://git.pengutronix.de/pza/linux:
reset: qcom-aoss: Allow CONFIG_RESET_QCOM_AOSS to be a tristate
reset: Add Broadcom STB RESCAL reset controller
dt-bindings: reset: Document BCM7216 RESCAL reset controller
reset: intel: Add system reset controller driver
dt-bindings: reset: Add YAML schemas for the Intel Reset controller
reset: uniphier: Add SCSSI reset control for each channel
reset: Align logic and flow in managed helpers
reset: npcm: add NPCM reset controller driver
dt-bindings: reset: Add binding constants for NPCM7xx reset controller
dt-bindings: reset: add NPCM reset controller documentation

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Olof Johansson <[e-mail]>

Documentation/devicetree/bindings/reset/brcm,bcm7216-pcie-sata-rescal.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2020 Broadcom
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/reset/brcm,bcm7216-pcie-sata-rescal.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: BCM7216 RESCAL reset controller
+
+description: This document describes the BCM7216 RESCAL reset controller which is responsible for controlling the reset of the SATA and PCIe0/1 instances on BCM7216.
+
+maintainers:
+  - Florian Fainelli <[e-mail]>
+  - Jim Quinlan <[e-mail]>
+
+properties:
+  compatible:
+    const: brcm,bcm7216-pcie-sata-rescal
+
+  reg:
+    maxItems: 1
+
+  "#reset-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - "#reset-cells"
+
+examples:
+  - |
+    reset-controller@8b2c800 {
+          compatible = "brcm,bcm7216-pcie-sata-rescal";
+          reg = <0x8b2c800 0x10>;
+          #reset-cells = <0>;
+    };

Documentation/devicetree/bindings/reset/intel,rcu-gw.yaml

···
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/reset/intel,rcu-gw.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: System Reset Controller on Intel Gateway SoCs
+
+maintainers:
+  - Dilip Kota <[e-mail]>
+
+properties:
+  compatible:
+    enum:
+      - intel,rcu-lgm
+      - intel,rcu-xrx200
+
+  reg:
+    description: Reset controller registers.
+    maxItems: 1
+
+  intel,global-reset:
+    description: Global reset register offset and bit offset.
+    allOf:
+      - $ref: /schemas/types.yaml#/definitions/uint32-array
+      - maxItems: 2
+
+  "#reset-cells":
+    minimum: 2
+    maximum: 3
+    description: |
+      First cell is reset request register offset.
+      Second cell is bit offset in reset request register.
+      Third cell is bit offset in reset status register.
+      For LGM SoC, reset cell count is 2 as bit offset in
+      reset request and reset status registers is same. Whereas
+      3 for legacy SoCs as bit offset differs.
+
+required:
+  - compatible
+  - reg
+  - intel,global-reset
+  - "#reset-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    rcu0: reset-controller@e0000000 {
+        compatible = "intel,rcu-lgm";
+        reg = <0xe0000000 0x20000>;
+        intel,global-reset = <0x10 30>;
+        #reset-cells = <2>;
+    };
+
+    pwm: pwm@e0d00000 {
+        status = "disabled";
+        compatible = "intel,lgm-pwm";
+        reg = <0xe0d00000 0x30>;
+        clocks = <&cgu0 1>;
+        #pwm-cells = <2>;
+        resets = <&rcu0 0x30 21>;
+    };

Documentation/devicetree/bindings/reset/nuvoton,npcm-reset.txt

···
+Nuvoton NPCM Reset controller
+
+Required properties:
+- compatible : "nuvoton,npcm750-reset" for NPCM7XX BMC
+- reg : specifies physical base address and size of the register.
+- #reset-cells: must be set to 2
+
+Optional property:
+- nuvoton,sw-reset-number - Contains the software reset number to restart the SoC.
+  NPCM7xx contain four software reset that represent numbers 1 to 4.
+
+  If 'nuvoton,sw-reset-number' is not specfied software reset is disabled.
+
+Example:
+	rstc: rstc@f0801000 {
+		compatible = "nuvoton,npcm750-reset";
+		reg = <0xf0801000 0x70>;
+		#reset-cells = <2>;
+		nuvoton,sw-reset-number = <2>;
+	};
+
+Specifying reset lines connected to IP NPCM7XX modules
+======================================================
+example:
+
+        spi0: spi@..... {
+                ...
+                resets = <&rstc NPCM7XX_RESET_IPSRST2 NPCM7XX_RESET_PSPI1>;
+                ...
+        };
+
+The index could be found in <dt-bindings/reset/nuvoton,npcm7xx-reset.h>.

drivers/reset/Kconfig

···
 	  This enables the reset controller driver for Broadcom STB SoCs using
 	  a SUN_TOP_CTRL_SW_INIT style controller.
 
+config RESET_BRCMSTB_RESCAL
+	bool "Broadcom STB RESCAL reset controller"
+	default ARCH_BRCMSTB || COMPILE_TEST
+	help
+	  This enables the RESCAL reset controller for SATA, PCIe0, or PCIe1 on
+	  BCM7216.
+
 config RESET_HSDK
 	bool "Synopsys HSDK Reset Driver"
 	depends on HAS_IOMEM
···
 	select MFD_SYSCON
 	help
 	  This enables the reset controller driver for i.MX7 SoCs.
+
+config RESET_INTEL_GW
+	bool "Intel Reset Controller Driver"
+	depends on OF
+	select REGMAP_MMIO
+	help
+	  This enables the reset controller driver for Intel Gateway SoCs.
+	  Say Y to control the reset signals provided by reset controller.
+	  Otherwise, say N.
 
 config RESET_LANTIQ
 	bool "Lantiq XWAY Reset Driver" if COMPILE_TEST
···
 	  This enables the reset driver for Audio Memory Arbiter of
 	  Amlogic's A113 based SoCs
 
+config RESET_NPCM
+	bool "NPCM BMC Reset Driver" if COMPILE_TEST
+	default ARCH_NPCM
+	help
+	  This enables the reset controller driver for Nuvoton NPCM
+	  BMC SoCs.
+
 config RESET_OXNAS
 	bool
 
···
 	  This enables the reset driver for ImgTec Pistachio SoCs.
 
 config RESET_QCOM_AOSS
-	bool "Qcom AOSS Reset Driver"
+	tristate "Qcom AOSS Reset Driver"
 	depends on ARCH_QCOM || COMPILE_TEST
 	help
 	  This enables the AOSS (always on subsystem) reset driver

drivers/reset/Makefile

···
 obj-$(CONFIG_RESET_AXS10X) += reset-axs10x.o
 obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
 obj-$(CONFIG_RESET_BRCMSTB) += reset-brcmstb.o
+obj-$(CONFIG_RESET_BRCMSTB_RESCAL) += reset-brcmstb-rescal.o
 obj-$(CONFIG_RESET_HSDK) += reset-hsdk.o
 obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
+obj-$(CONFIG_RESET_INTEL_GW) += reset-intel-gw.o
 obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o
 obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o
 obj-$(CONFIG_RESET_MESON) += reset-meson.o
 obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o
+obj-$(CONFIG_RESET_NPCM) += reset-npcm.o
 obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
 obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
 obj-$(CONFIG_RESET_QCOM_AOSS) += reset-qcom-aoss.o

drivers/reset/core.c

···
 		return -ENOMEM;
 
 	ret = reset_controller_register(rcdev);
-	if (!ret) {
-		*rcdevp = rcdev;
-		devres_add(dev, rcdevp);
-	} else {
+	if (ret) {
 		devres_free(rcdevp);
+		return ret;
 	}
+
+	*rcdevp = rcdev;
+	devres_add(dev, rcdevp);
 
 	return ret;
 }
···
 		return ERR_PTR(-ENOMEM);
 
 	rstc = __reset_control_get(dev, id, index, shared, optional, acquired);
-	if (!IS_ERR_OR_NULL(rstc)) {
-		*ptr = rstc;
-		devres_add(dev, ptr);
-	} else {
+	if (IS_ERR_OR_NULL(rstc)) {
 		devres_free(ptr);
+		return rstc;
 	}
+
+	*ptr = rstc;
+	devres_add(dev, ptr);
 
 	return rstc;
 }
···
 struct reset_control *
 devm_reset_control_array_get(struct device *dev, bool shared, bool optional)
 {
-	struct reset_control **devres;
-	struct reset_control *rstc;
+	struct reset_control **ptr, *rstc;
 
-	devres = devres_alloc(devm_reset_control_release, sizeof(*devres),
-			      GFP_KERNEL);
-	if (!devres)
+	ptr = devres_alloc(devm_reset_control_release, sizeof(*ptr),
+			   GFP_KERNEL);
+	if (!ptr)
 		return ERR_PTR(-ENOMEM);
 
 	rstc = of_reset_control_array_get(dev->of_node, shared, optional, true);
 	if (IS_ERR_OR_NULL(rstc)) {
-		devres_free(devres);
+		devres_free(ptr);
 		return rstc;
 	}
 
-	*devres = rstc;
-	devres_add(dev, devres);
+	*ptr = rstc;
+	devres_add(dev, ptr);
 
 	return rstc;
 }

drivers/reset/reset-brcmstb-rescal.c

···
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (C) 2018-2020 Broadcom */
+
+#include <linux/device.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+#define BRCM_RESCAL_START	0x0
+#define  BRCM_RESCAL_START_BIT	BIT(0)
+#define BRCM_RESCAL_CTRL	0x4
+#define BRCM_RESCAL_STATUS	0x8
+#define  BRCM_RESCAL_STATUS_BIT	BIT(0)
+
+struct brcm_rescal_reset {
+	void __iomem *base;
+	struct device *dev;
+	struct reset_controller_dev rcdev;
+};
+
+static int brcm_rescal_reset_set(struct reset_controller_dev *rcdev,
+				 unsigned long id)
+{
+	struct brcm_rescal_reset *data =
+		container_of(rcdev, struct brcm_rescal_reset, rcdev);
+	void __iomem *base = data->base;
+	u32 reg;
+	int ret;
+
+	reg = readl(base + BRCM_RESCAL_START);
+	writel(reg | BRCM_RESCAL_START_BIT, base + BRCM_RESCAL_START);
+	reg = readl(base + BRCM_RESCAL_START);
+	if (!(reg & BRCM_RESCAL_START_BIT)) {
+		dev_err(data->dev, "failed to start SATA/PCIe rescal\n");
+		return -EIO;
+	}
+
+	ret = readl_poll_timeout(base + BRCM_RESCAL_STATUS, reg,
+				 !(reg & BRCM_RESCAL_STATUS_BIT), 100, 1000);
+	if (ret) {
+		dev_err(data->dev, "time out on SATA/PCIe rescal\n");
+		return ret;
+	}
+
+	reg = readl(base + BRCM_RESCAL_START);
+	writel(reg & ~BRCM_RESCAL_START_BIT, base + BRCM_RESCAL_START);
+
+	dev_dbg(data->dev, "SATA/PCIe rescal success\n");
+
+	return 0;
+}
+
+static int brcm_rescal_reset_xlate(struct reset_controller_dev *rcdev,
+				   const struct of_phandle_args *reset_spec)
+{
+	/* This is needed if #reset-cells == 0. */
+	return 0;
+}
+
+static const struct reset_control_ops brcm_rescal_reset_ops = {
+	.reset = brcm_rescal_reset_set,
+};
+
+static int brcm_rescal_reset_probe(struct platform_device *pdev)
+{
+	struct brcm_rescal_reset *data;
+	struct resource *res;
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	data->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data->base))
+		return PTR_ERR(data->base);
+
+	data->rcdev.owner = THIS_MODULE;
+	data->rcdev.nr_resets = 1;
+	data->rcdev.ops = &brcm_rescal_reset_ops;
+	data->rcdev.of_node = pdev->dev.of_node;
+	data->rcdev.of_xlate = brcm_rescal_reset_xlate;
+	data->dev = &pdev->dev;
+
+	return devm_reset_controller_register(&pdev->dev, &data->rcdev);
+}
+
+static const struct of_device_id brcm_rescal_reset_of_match[] = {
+	{ .compatible = "brcm,bcm7216-pcie-sata-rescal" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, brcm_rescal_reset_of_match);
+
+static struct platform_driver brcm_rescal_reset_driver = {
+	.probe = brcm_rescal_reset_probe,
+	.driver = {
+		.name	= "brcm-rescal-reset",
+		.of_match_table	= brcm_rescal_reset_of_match,
+	}
+};
+module_platform_driver(brcm_rescal_reset_driver);
+
+MODULE_AUTHOR("Broadcom");
+MODULE_DESCRIPTION("Broadcom SATA/PCIe rescal reset controller");
+MODULE_LICENSE("GPL v2");

drivers/reset/reset-intel-gw.c

···
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Intel Corporation.
+ * Lei Chuanhua <[e-mail]>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/init.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+
+#define RCU_RST_STAT	0x0024
+#define RCU_RST_REQ	0x0048
+
+#define REG_OFFSET	GENMASK(31, 16)
+#define BIT_OFFSET	GENMASK(15, 8)
+#define STAT_BIT_OFFSET	GENMASK(7, 0)
+
+#define to_reset_data(x)	container_of(x, struct intel_reset_data, rcdev)
+
+struct intel_reset_soc {
+	bool legacy;
+	u32 reset_cell_count;
+};
+
+struct intel_reset_data {
+	struct reset_controller_dev rcdev;
+	struct notifier_block restart_nb;
+	const struct intel_reset_soc *soc_data;
+	struct regmap *regmap;
+	struct device *dev;
+	u32 reboot_id;
+};
+
+static const struct regmap_config intel_rcu_regmap_config = {
+	.name =		"intel-reset",
+	.reg_bits =	32,
+	.reg_stride =	4,
+	.val_bits =	32,
+	.fast_io =	true,
+};
+
+/*
+ * Reset status register offset relative to
+ * the reset control register(X) is X + 4
+ */
+static u32 id_to_reg_and_bit_offsets(struct intel_reset_data *data,
+				     unsigned long id, u32 *rst_req,
+				     u32 *req_bit, u32 *stat_bit)
+{
+	*rst_req = FIELD_GET(REG_OFFSET, id);
+	*req_bit = FIELD_GET(BIT_OFFSET, id);
+
+	if (data->soc_data->legacy)
+		*stat_bit = FIELD_GET(STAT_BIT_OFFSET, id);
+	else
+		*stat_bit = *req_bit;
+
+	if (data->soc_data->legacy && *rst_req == RCU_RST_REQ)
+		return RCU_RST_STAT;
+	else
+		return *rst_req + 0x4;
+}
+
+static int intel_set_clr_bits(struct intel_reset_data *data, unsigned long id,
+			      bool set)
+{
+	u32 rst_req, req_bit, rst_stat, stat_bit, val;
+	int ret;
+
+	rst_stat = id_to_reg_and_bit_offsets(data, id, &rst_req,
+					     &req_bit, &stat_bit);
+
+	val = set ? BIT(req_bit) : 0;
+	ret = regmap_update_bits(data->regmap, rst_req,  BIT(req_bit), val);
+	if (ret)
+		return ret;
+
+	return regmap_read_poll_timeout(data->regmap, rst_stat, val,
+					set == !!(val & BIT(stat_bit)), 20,
+					200);
+}
+
+static int intel_assert_device(struct reset_controller_dev *rcdev,
+			       unsigned long id)
+{
+	struct intel_reset_data *data = to_reset_data(rcdev);
+	int ret;
+
+	ret = intel_set_clr_bits(data, id, true);
+	if (ret)
+		dev_err(data->dev, "Reset assert failed %d\n", ret);
+
+	return ret;
+}
+
+static int intel_deassert_device(struct reset_controller_dev *rcdev,
+				 unsigned long id)
+{
+	struct intel_reset_data *data = to_reset_data(rcdev);
+	int ret;
+
+	ret = intel_set_clr_bits(data, id, false);
+	if (ret)
+		dev_err(data->dev, "Reset deassert failed %d\n", ret);
+
+	return ret;
+}
+
+static int intel_reset_status(struct reset_controller_dev *rcdev,
+			      unsigned long id)
+{
+	struct intel_reset_data *data = to_reset_data(rcdev);
+	u32 rst_req, req_bit, rst_stat, stat_bit, val;
+	int ret;
+
+	rst_stat = id_to_reg_and_bit_offsets(data, id, &rst_req,
+					     &req_bit, &stat_bit);
+	ret = regmap_read(data->regmap, rst_stat, &val);
+	if (ret)
+		return ret;
+
+	return !!(val & BIT(stat_bit));
+}
+
+static const struct reset_control_ops intel_reset_ops = {
+	.assert =	intel_assert_device,
+	.deassert =	intel_deassert_device,
+	.status	=	intel_reset_status,
+};
+
+static int intel_reset_xlate(struct reset_controller_dev *rcdev,
+			     const struct of_phandle_args *spec)
+{
+	struct intel_reset_data *data = to_reset_data(rcdev);
+	u32 id;
+
+	if (spec->args[1] > 31)
+		return -EINVAL;
+
+	id = FIELD_PREP(REG_OFFSET, spec->args[0]);
+	id |= FIELD_PREP(BIT_OFFSET, spec->args[1]);
+
+	if (data->soc_data->legacy) {
+		if (spec->args[2] > 31)
+			return -EINVAL;
+
+		id |= FIELD_PREP(STAT_BIT_OFFSET, spec->args[2]);
+	}
+
+	return id;
+}
+
+static int intel_reset_restart_handler(struct notifier_block *nb,
+				       unsigned long action, void *data)
+{
+	struct intel_reset_data *reset_data;
+
+	reset_data = container_of(nb, struct intel_reset_data, restart_nb);
+	intel_assert_device(&reset_data->rcdev, reset_data->reboot_id);
+
+	return NOTIFY_DONE;
+}
+
+static int intel_reset_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	struct intel_reset_data *data;
+	void __iomem *base;
+	u32 rb_id[3];
+	int ret;
+
+	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->soc_data = of_device_get_match_data(dev);
+	if (!data->soc_data)
+		return -ENODEV;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	data->regmap = devm_regmap_init_mmio(dev, base,
+					     &intel_rcu_regmap_config);
+	if (IS_ERR(data->regmap)) {
+		dev_err(dev, "regmap initialization failed\n");
+		return PTR_ERR(data->regmap);
+	}
+
+	ret = device_property_read_u32_array(dev, "intel,global-reset", rb_id,
+					     data->soc_data->reset_cell_count);
+	if (ret) {
+		dev_err(dev, "Failed to get global reset offset!\n");
+		return ret;
+	}
+
+	data->dev =			dev;
+	data->rcdev.of_node =		np;
+	data->rcdev.owner =		dev->driver->owner;
+	data->rcdev.ops	=		&intel_reset_ops;
+	data->rcdev.of_xlate =		intel_reset_xlate;
+	data->rcdev.of_reset_n_cells =	data->soc_data->reset_cell_count;
+	ret = devm_reset_controller_register(&pdev->dev, &data->rcdev);
+	if (ret)
+		return ret;
+
+	data->reboot_id = FIELD_PREP(REG_OFFSET, rb_id[0]);
+	data->reboot_id |= FIELD_PREP(BIT_OFFSET, rb_id[1]);
+
+	if (data->soc_data->legacy)
+		data->reboot_id |= FIELD_PREP(STAT_BIT_OFFSET, rb_id[2]);
+
+	data->restart_nb.notifier_call =	intel_reset_restart_handler;
+	data->restart_nb.priority =		128;
+	register_restart_handler(&data->restart_nb);
+
+	return 0;
+}
+
+static const struct intel_reset_soc xrx200_data = {
+	.legacy =		true,
+	.reset_cell_count =	3,
+};
+
+static const struct intel_reset_soc lgm_data = {
+	.legacy =		false,
+	.reset_cell_count =	2,
+};
+
+static const struct of_device_id intel_reset_match[] = {
+	{ .compatible = "intel,rcu-lgm", .data = &lgm_data },
+	{ .compatible = "intel,rcu-xrx200", .data = &xrx200_data },
+	{}
+};
+
+static struct platform_driver intel_reset_driver = {
+	.probe = intel_reset_probe,
+	.driver = {
+		.name = "intel-reset",
+		.of_match_table = intel_reset_match,
+	},
+};
+
+static int __init intel_reset_init(void)
+{
+	return platform_driver_register(&intel_reset_driver);
+}
+
+/*
+ * RCU is system core entity which is in Always On Domain whose clocks
+ * or resource initialization happens in system core initialization.
+ * Also, it is required for most of the platform or architecture
+ * specific devices to perform reset operation as part of initialization.
+ * So perform RCU as post core initialization.
+ */
+postcore_initcall(intel_reset_init);

drivers/reset/reset-npcm.c

···
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Nuvoton Technology corporation.
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reboot.h>
+#include <linux/reset-controller.h>
+#include <linux/spinlock.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+#include <linux/of_address.h>
+
+/* NPCM7xx GCR registers */
+#define NPCM_MDLR_OFFSET	0x7C
+#define NPCM_MDLR_USBD0		BIT(9)
+#define NPCM_MDLR_USBD1		BIT(8)
+#define NPCM_MDLR_USBD2_4	BIT(21)
+#define NPCM_MDLR_USBD5_9	BIT(22)
+
+#define NPCM_USB1PHYCTL_OFFSET	0x140
+#define NPCM_USB2PHYCTL_OFFSET	0x144
+#define NPCM_USBXPHYCTL_RS	BIT(28)
+
+/* NPCM7xx Reset registers */
+#define NPCM_SWRSTR		0x14
+#define NPCM_SWRST		BIT(2)
+
+#define NPCM_IPSRST1		0x20
+#define NPCM_IPSRST1_USBD1	BIT(5)
+#define NPCM_IPSRST1_USBD2	BIT(8)
+#define NPCM_IPSRST1_USBD3	BIT(25)
+#define NPCM_IPSRST1_USBD4	BIT(22)
+#define NPCM_IPSRST1_USBD5	BIT(23)
+#define NPCM_IPSRST1_USBD6	BIT(24)
+
+#define NPCM_IPSRST2		0x24
+#define NPCM_IPSRST2_USB_HOST	BIT(26)
+
+#define NPCM_IPSRST3		0x34
+#define NPCM_IPSRST3_USBD0	BIT(4)
+#define NPCM_IPSRST3_USBD7	BIT(5)
+#define NPCM_IPSRST3_USBD8	BIT(6)
+#define NPCM_IPSRST3_USBD9	BIT(7)
+#define NPCM_IPSRST3_USBPHY1	BIT(24)
+#define NPCM_IPSRST3_USBPHY2	BIT(25)
+
+#define NPCM_RC_RESETS_PER_REG	32
+#define NPCM_MASK_RESETS	GENMASK(4, 0)
+
+struct npcm_rc_data {
+	struct reset_controller_dev rcdev;
+	struct notifier_block restart_nb;
+	u32 sw_reset_number;
+	void __iomem *base;
+	spinlock_t lock;
+};
+
+#define to_rc_data(p) container_of(p, struct npcm_rc_data, rcdev)
+
+static int npcm_rc_restart(struct notifier_block *nb, unsigned long mode,
+			   void *cmd)
+{
+	struct npcm_rc_data *rc = container_of(nb, struct npcm_rc_data,
+					       restart_nb);
+
+	writel(NPCM_SWRST << rc->sw_reset_number, rc->base + NPCM_SWRSTR);
+	mdelay(1000);
+
+	pr_emerg("%s: unable to restart system\n", __func__);
+
+	return NOTIFY_DONE;
+}
+
+static int npcm_rc_setclear_reset(struct reset_controller_dev *rcdev,
+				  unsigned long id, bool set)
+{
+	struct npcm_rc_data *rc = to_rc_data(rcdev);
+	unsigned int rst_bit = BIT(id & NPCM_MASK_RESETS);
+	unsigned int ctrl_offset = id >> 8;
+	unsigned long flags;
+	u32 stat;
+
+	spin_lock_irqsave(&rc->lock, flags);
+	stat = readl(rc->base + ctrl_offset);
+	if (set)
+		writel(stat | rst_bit, rc->base + ctrl_offset);
+	else
+		writel(stat & ~rst_bit, rc->base + ctrl_offset);
+	spin_unlock_irqrestore(&rc->lock, flags);
+
+	return 0;
+}
+
+static int npcm_rc_assert(struct reset_controller_dev *rcdev, unsigned long id)
+{
+	return npcm_rc_setclear_reset(rcdev, id, true);
+}
+
+static int npcm_rc_deassert(struct reset_controller_dev *rcdev,
+			    unsigned long id)
+{
+	return npcm_rc_setclear_reset(rcdev, id, false);
+}
+
+static int npcm_rc_status(struct reset_controller_dev *rcdev,
+			  unsigned long id)
+{
+	struct npcm_rc_data *rc = to_rc_data(rcdev);
+	unsigned int rst_bit = BIT(id & NPCM_MASK_RESETS);
+	unsigned int ctrl_offset = id >> 8;
+
+	return (readl(rc->base + ctrl_offset) & rst_bit);
+}
+
+static int npcm_reset_xlate(struct reset_controller_dev *rcdev,
+			    const struct of_phandle_args *reset_spec)
+{
+	unsigned int offset, bit;
+
+	offset = reset_spec->args[0];
+	if (offset != NPCM_IPSRST1 && offset != NPCM_IPSRST2 &&
+	    offset != NPCM_IPSRST3) {
+		dev_err(rcdev->dev, "Error reset register (0x%x)\n", offset);
+		return -EINVAL;
+	}
+	bit = reset_spec->args[1];
+	if (bit >= NPCM_RC_RESETS_PER_REG) {
+		dev_err(rcdev->dev, "Error reset number (%d)\n", bit);
+		return -EINVAL;
+	}
+
+	return (offset << 8) | bit;
+}
+
+static const struct of_device_id npcm_rc_match[] = {
+	{ .compatible = "nuvoton,npcm750-reset",
+		.data = (void *)"nuvoton,npcm750-gcr" },
+	{ }
+};
+
+/*
+ *  The following procedure should be observed in USB PHY, USB device and
+ *  USB host initialization at BMC boot
+ */
+static int npcm_usb_reset(struct platform_device *pdev, struct npcm_rc_data *rc)
+{
+	u32 mdlr, iprst1, iprst2, iprst3;
+	struct device *dev = &pdev->dev;
+	struct regmap *gcr_regmap;
+	u32 ipsrst1_bits = 0;
+	u32 ipsrst2_bits = NPCM_IPSRST2_USB_HOST;
+	u32 ipsrst3_bits = 0;
+	const char *gcr_dt;
+
+	gcr_dt = (const char *)
+	of_match_device(dev->driver->of_match_table, dev)->data;
+
+	gcr_regmap = syscon_regmap_lookup_by_compatible(gcr_dt);
+	if (IS_ERR(gcr_regmap)) {
+		dev_err(&pdev->dev, "Failed to find %s\n", gcr_dt);
+		return PTR_ERR(gcr_regmap);
+	}
+
+	/* checking which USB device is enabled */
+	regmap_read(gcr_regmap, NPCM_MDLR_OFFSET, &mdlr);
+	if (!(mdlr & NPCM_MDLR_USBD0))
+		ipsrst3_bits |= NPCM_IPSRST3_USBD0;
+	if (!(mdlr & NPCM_MDLR_USBD1))
+		ipsrst1_bits |= NPCM_IPSRST1_USBD1;
+	if (!(mdlr & NPCM_MDLR_USBD2_4))
+		ipsrst1_bits |= (NPCM_IPSRST1_USBD2 |
+				 NPCM_IPSRST1_USBD3 |
+				 NPCM_IPSRST1_USBD4);
+	if (!(mdlr & NPCM_MDLR_USBD0)) {
+		ipsrst1_bits |= (NPCM_IPSRST1_USBD5 |
+				 NPCM_IPSRST1_USBD6);
+		ipsrst3_bits |= (NPCM_IPSRST3_USBD7 |
+				 NPCM_IPSRST3_USBD8 |
+				 NPCM_IPSRST3_USBD9);
+	}
+
+	/* assert reset USB PHY and USB devices */
+	iprst1 = readl(rc->base + NPCM_IPSRST1);
+	iprst2 = readl(rc->base + NPCM_IPSRST2);
+	iprst3 = readl(rc->base + NPCM_IPSRST3);
+
+	iprst1 |= ipsrst1_bits;
+	iprst2 |= ipsrst2_bits;
+	iprst3 |= (ipsrst3_bits | NPCM_IPSRST3_USBPHY1 |
+		   NPCM_IPSRST3_USBPHY2);
+
+	writel(iprst1, rc->base + NPCM_IPSRST1);
+	writel(iprst2, rc->base + NPCM_IPSRST2);
+	writel(iprst3, rc->base + NPCM_IPSRST3);
+
+	/* clear USB PHY RS bit */
+	regmap_update_bits(gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
+			   NPCM_USBXPHYCTL_RS, 0);
+	regmap_update_bits(gcr_regmap, NPCM_USB2PHYCTL_OFFSET,
+			   NPCM_USBXPHYCTL_RS, 0);
+
+	/* deassert reset USB PHY */
+	iprst3 &= ~(NPCM_IPSRST3_USBPHY1 | NPCM_IPSRST3_USBPHY2);
+	writel(iprst3, rc->base + NPCM_IPSRST3);
+
+	udelay(50);
+
+	/* set USB PHY RS bit */
+	regmap_update_bits(gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
+			   NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
+	regmap_update_bits(gcr_regmap, NPCM_USB2PHYCTL_OFFSET,
+			   NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
+
+	/* deassert reset USB devices*/
+	iprst1 &= ~ipsrst1_bits;
+	iprst2 &= ~ipsrst2_bits;
+	iprst3 &= ~ipsrst3_bits;
+
+	writel(iprst1, rc->base + NPCM_IPSRST1);
+	writel(iprst2, rc->base + NPCM_IPSRST2);
+	writel(iprst3, rc->base + NPCM_IPSRST3);
+
+	return 0;
+}
+
+static const struct reset_control_ops npcm_rc_ops = {
+	.assert		= npcm_rc_assert,
+	.deassert	= npcm_rc_deassert,
+	.status		= npcm_rc_status,
+};
+
+static int npcm_rc_probe(struct platform_device *pdev)
+{
+	struct npcm_rc_data *rc;
+	int ret;
+
+	rc = devm_kzalloc(&pdev->dev, sizeof(*rc), GFP_KERNEL);
+	if (!rc)
+		return -ENOMEM;
+
+	rc->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(rc->base))
+		return PTR_ERR(rc->base);
+
+	spin_lock_init(&rc->lock);
+
+	rc->rcdev.owner = THIS_MODULE;
+	rc->rcdev.ops = &npcm_rc_ops;
+	rc->rcdev.of_node = pdev->dev.of_node;
+	rc->rcdev.of_reset_n_cells = 2;
+	rc->rcdev.of_xlate = npcm_reset_xlate;
+
+	platform_set_drvdata(pdev, rc);
+
+	ret = devm_reset_controller_register(&pdev->dev, &rc->rcdev);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to register device\n");
+		return ret;
+	}
+
+	if (npcm_usb_reset(pdev, rc))
+		dev_warn(&pdev->dev, "NPCM USB reset failed, can cause issues with UDC and USB host\n");
+
+	if (!of_property_read_u32(pdev->dev.of_node, "nuvoton,sw-reset-number",
+				  &rc->sw_reset_number)) {
+		if (rc->sw_reset_number && rc->sw_reset_number < 5) {
+			rc->restart_nb.priority = 192,
+			rc->restart_nb.notifier_call = npcm_rc_restart,
+			ret = register_restart_handler(&rc->restart_nb);
+			if (ret)
+				dev_warn(&pdev->dev, "failed to register restart handler\n");
+		}
+	}
+
+	return ret;
+}
+
+static struct platform_driver npcm_rc_driver = {
+	.probe	= npcm_rc_probe,
+	.driver	= {
+		.name			= "npcm-reset",
+		.of_match_table		= npcm_rc_match,
+		.suppress_bind_attrs	= true,
+	},
+};
+builtin_platform_driver(npcm_rc_driver);

drivers/reset/reset-qcom-aoss.c

···
 	{ .compatible = "qcom,sdm845-aoss-cc", .data = &sdm845_aoss_desc },
 	{}
 };
+MODULE_DEVICE_TABLE(of, qcom_aoss_reset_of_match);
 
 static struct platform_driver qcom_aoss_reset_driver = {
 	.probe = qcom_aoss_reset_probe,
···
 	},
 };
 
-builtin_platform_driver(qcom_aoss_reset_driver);
+module_platform_driver(qcom_aoss_reset_driver);
 
 MODULE_DESCRIPTION("Qualcomm AOSS Reset Driver");
 MODULE_LICENSE("GPL v2");

drivers/reset/reset-uniphier.c

···
 #define UNIPHIER_PERI_RESET_FI2C(id, ch)		\
 	UNIPHIER_RESETX((id), 0x114, 24 + (ch))
 
-#define UNIPHIER_PERI_RESET_SCSSI(id)			\
-	UNIPHIER_RESETX((id), 0x110, 17)
+#define UNIPHIER_PERI_RESET_SCSSI(id, ch)		\
+	UNIPHIER_RESETX((id), 0x110, 17 + (ch))
 
 #define UNIPHIER_PERI_RESET_MCSSI(id)			\
 	UNIPHIER_RESETX((id), 0x114, 14)
···
 	UNIPHIER_PERI_RESET_I2C(6, 2),
 	UNIPHIER_PERI_RESET_I2C(7, 3),
 	UNIPHIER_PERI_RESET_I2C(8, 4),
-	UNIPHIER_PERI_RESET_SCSSI(11),
+	UNIPHIER_PERI_RESET_SCSSI(11, 0),
 	UNIPHIER_RESET_END,
 };
 
···
 	UNIPHIER_PERI_RESET_FI2C(8, 4),
 	UNIPHIER_PERI_RESET_FI2C(9, 5),
 	UNIPHIER_PERI_RESET_FI2C(10, 6),
-	UNIPHIER_PERI_RESET_SCSSI(11),
-	UNIPHIER_PERI_RESET_MCSSI(12),
+	UNIPHIER_PERI_RESET_SCSSI(11, 0),
+	UNIPHIER_PERI_RESET_SCSSI(12, 1),
+	UNIPHIER_PERI_RESET_SCSSI(13, 2),
+	UNIPHIER_PERI_RESET_SCSSI(14, 3),
+	UNIPHIER_PERI_RESET_MCSSI(15),
 	UNIPHIER_RESET_END,
 };
 

include/dt-bindings/reset/nuvoton,npcm7xx-reset.h

···
+/* SPDX-License-Identifier: GPL-2.0 */
+// Copyright (c) 2019 Nuvoton Technology corporation.
+
+#ifndef _DT_BINDINGS_NPCM7XX_RESET_H
+#define _DT_BINDINGS_NPCM7XX_RESET_H
+
+#define NPCM7XX_RESET_IPSRST1		0x20
+#define NPCM7XX_RESET_IPSRST2		0x24
+#define NPCM7XX_RESET_IPSRST3		0x34
+
+/* Reset lines on IP1 reset module (NPCM7XX_RESET_IPSRST1) */
+#define NPCM7XX_RESET_FIU3		1
+#define NPCM7XX_RESET_UDC1		5
+#define NPCM7XX_RESET_EMC1		6
+#define NPCM7XX_RESET_UART_2_3		7
+#define NPCM7XX_RESET_UDC2		8
+#define NPCM7XX_RESET_PECI		9
+#define NPCM7XX_RESET_AES		10
+#define NPCM7XX_RESET_UART_0_1		11
+#define NPCM7XX_RESET_MC		12
+#define NPCM7XX_RESET_SMB2		13
+#define NPCM7XX_RESET_SMB3		14
+#define NPCM7XX_RESET_SMB4		15
+#define NPCM7XX_RESET_SMB5		16
+#define NPCM7XX_RESET_PWM_M0		18
+#define NPCM7XX_RESET_TIMER_0_4		19
+#define NPCM7XX_RESET_TIMER_5_9		20
+#define NPCM7XX_RESET_EMC2		21
+#define NPCM7XX_RESET_UDC4		22
+#define NPCM7XX_RESET_UDC5		23
+#define NPCM7XX_RESET_UDC6		24
+#define NPCM7XX_RESET_UDC3		25
+#define NPCM7XX_RESET_ADC		27
+#define NPCM7XX_RESET_SMB6		28
+#define NPCM7XX_RESET_SMB7		29
+#define NPCM7XX_RESET_SMB0		30
+#define NPCM7XX_RESET_SMB1		31
+
+/* Reset lines on IP2 reset module (NPCM7XX_RESET_IPSRST2) */
+#define NPCM7XX_RESET_MFT0		0
+#define NPCM7XX_RESET_MFT1		1
+#define NPCM7XX_RESET_MFT2		2
+#define NPCM7XX_RESET_MFT3		3
+#define NPCM7XX_RESET_MFT4		4
+#define NPCM7XX_RESET_MFT5		5
+#define NPCM7XX_RESET_MFT6		6
+#define NPCM7XX_RESET_MFT7		7
+#define NPCM7XX_RESET_MMC		8
+#define NPCM7XX_RESET_SDHC		9
+#define NPCM7XX_RESET_GFX_SYS		10
+#define NPCM7XX_RESET_AHB_PCIBRG	11
+#define NPCM7XX_RESET_VDMA		12
+#define NPCM7XX_RESET_ECE		13
+#define NPCM7XX_RESET_VCD		14
+#define NPCM7XX_RESET_OTP		16
+#define NPCM7XX_RESET_SIOX1		18
+#define NPCM7XX_RESET_SIOX2		19
+#define NPCM7XX_RESET_3DES		21
+#define NPCM7XX_RESET_PSPI1		22
+#define NPCM7XX_RESET_PSPI2		23
+#define NPCM7XX_RESET_GMAC2		25
+#define NPCM7XX_RESET_USB_HOST		26
+#define NPCM7XX_RESET_GMAC1		28
+#define NPCM7XX_RESET_CP		31
+
+/* Reset lines on IP3 reset module (NPCM7XX_RESET_IPSRST3) */
+#define NPCM7XX_RESET_PWM_M1		0
+#define NPCM7XX_RESET_SMB12		1
+#define NPCM7XX_RESET_SPIX		2
+#define NPCM7XX_RESET_SMB13		3
+#define NPCM7XX_RESET_UDC0		4
+#define NPCM7XX_RESET_UDC7		5
+#define NPCM7XX_RESET_UDC8		6
+#define NPCM7XX_RESET_UDC9		7
+#define NPCM7XX_RESET_PCI_MAILBOX	9
+#define NPCM7XX_RESET_SMB14		12
+#define NPCM7XX_RESET_SHA		13
+#define NPCM7XX_RESET_SEC_ECC		14
+#define NPCM7XX_RESET_PCIE_RC		15
+#define NPCM7XX_RESET_TIMER_10_14	16
+#define NPCM7XX_RESET_RNG		17
+#define NPCM7XX_RESET_SMB15		18
+#define NPCM7XX_RESET_SMB8		19
+#define NPCM7XX_RESET_SMB9		20
+#define NPCM7XX_RESET_SMB10		21
+#define NPCM7XX_RESET_SMB11		22
+#define NPCM7XX_RESET_ESPI		23
+#define NPCM7XX_RESET_USB_PHY_1		24
+#define NPCM7XX_RESET_USB_PHY_2		25
+
+#endif