regulator: uniphier: add regulator driver for UniPhier SoC (9df4f909) · Commits · EulixOS / Software / Kernel

drivers/regulator/Kconfig

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		@@ -950,6 +950,14 @@ config REGULATOR_TWL4030
		This driver supports the voltage regulators provided by
		this family of companion chips.

		config REGULATOR_UNIPHIER
		tristate "UniPhier regulator driver"
		depends on ARCH_UNIPHIER \|\| COMPILE_TEST
		depends on OF && MFD_SYSCON
		default ARCH_UNIPHIER
		help
		Support for regulators implemented on Socionext UniPhier SoCs.

		config REGULATOR_VCTRL
		tristate "Voltage controlled regulators"
		depends on OF

drivers/regulator/Makefile

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		@@ -118,6 +118,7 @@ obj-$(CONFIG_REGULATOR_TPS65912) += tps65912-regulator.o
		obj-$(CONFIG_REGULATOR_TPS80031) += tps80031-regulator.o
		obj-$(CONFIG_REGULATOR_TPS65132) += tps65132-regulator.o
		obj-$(CONFIG_REGULATOR_TWL4030) += twl-regulator.o twl6030-regulator.o
		obj-$(CONFIG_REGULATOR_UNIPHIER) += uniphier-regulator.o
		obj-$(CONFIG_REGULATOR_VCTRL) += vctrl-regulator.o
		obj-$(CONFIG_REGULATOR_VEXPRESS) += vexpress-regulator.o
		obj-$(CONFIG_REGULATOR_WM831X) += wm831x-dcdc.o

drivers/regulator/uniphier-regulator.c

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		// SPDX-License-Identifier: GPL-2.0
		//
		// Regulator controller driver for UniPhier SoC
		// Copyright 2018 Socionext Inc.
		// Author: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>

		#include <linux/clk.h>
		#include <linux/io.h>
		#include <linux/module.h>
		#include <linux/of_device.h>
		#include <linux/platform_device.h>
		#include <linux/regmap.h>
		#include <linux/regulator/driver.h>
		#include <linux/regulator/of_regulator.h>
		#include <linux/reset.h>

		#define MAX_CLKS 2
		#define MAX_RSTS 2

		struct uniphier_regulator_soc_data {
		int nclks;
		const char * const *clock_names;
		int nrsts;
		const char * const *reset_names;
		const struct regulator_desc *desc;
		const struct regmap_config *regconf;
		};

		struct uniphier_regulator_priv {
		struct clk_bulk_data clk[MAX_CLKS];
		struct reset_control *rst[MAX_RSTS];
		const struct uniphier_regulator_soc_data *data;
		};

		static struct regulator_ops uniphier_regulator_ops = {
		.enable = regulator_enable_regmap,
		.disable = regulator_disable_regmap,
		.is_enabled = regulator_is_enabled_regmap,
		};

		static int uniphier_regulator_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct uniphier_regulator_priv *priv;
		struct regulator_config config = { };
		struct regulator_dev *rdev;
		struct regmap *regmap;
		struct resource *res;
		void __iomem *base;
		const char *name;
		int i, ret, nr;

		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
		if (!priv)
		return -ENOMEM;

		priv->data = of_device_get_match_data(dev);
		if (WARN_ON(!priv->data))
		return -EINVAL;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		base = devm_ioremap_resource(dev, res);
		if (IS_ERR(base))
		return PTR_ERR(base);

		for (i = 0; i < priv->data->nclks; i++)
		priv->clk[i].id = priv->data->clock_names[i];
		ret = devm_clk_bulk_get(dev, priv->data->nclks, priv->clk);
		if (ret)
		return ret;

		for (i = 0; i < priv->data->nrsts; i++) {
		name = priv->data->reset_names[i];
		priv->rst[i] = devm_reset_control_get_shared(dev, name);
		if (IS_ERR(priv->rst[i]))
		return PTR_ERR(priv->rst[i]);
		}

		ret = clk_bulk_prepare_enable(priv->data->nclks, priv->clk);
		if (ret)
		return ret;

		for (nr = 0; nr < priv->data->nrsts; nr++) {
		ret = reset_control_deassert(priv->rst[nr]);
		if (ret)
		goto out_rst_assert;
		}

		regmap = devm_regmap_init_mmio(dev, base, priv->data->regconf);
		if (IS_ERR(regmap))
		return PTR_ERR(regmap);

		config.dev = dev;
		config.driver_data = priv;
		config.of_node = dev->of_node;
		config.regmap = regmap;
		config.init_data = of_get_regulator_init_data(dev, dev->of_node,
		priv->data->desc);
		rdev = devm_regulator_register(dev, priv->data->desc, &config);
		if (IS_ERR(rdev)) {
		ret = PTR_ERR(rdev);
		goto out_rst_assert;
		}

		platform_set_drvdata(pdev, priv);

		return 0;

		out_rst_assert:
		while (nr--)
		reset_control_assert(priv->rst[nr]);

		clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);

		return ret;
		}

		static int uniphier_regulator_remove(struct platform_device *pdev)
		{
		struct uniphier_regulator_priv *priv = platform_get_drvdata(pdev);
		int i;

		for (i = 0; i < priv->data->nrsts; i++)
		reset_control_assert(priv->rst[i]);

		clk_bulk_disable_unprepare(priv->data->nclks, priv->clk);

		return 0;
		}

		/* USB3 controller data */
		#define USB3VBUS_OFFSET 0x0
		#define USB3VBUS_REG BIT(4)
		#define USB3VBUS_REG_EN BIT(3)
		static const struct regulator_desc uniphier_usb3_regulator_desc = {
		.name = "vbus",
		.of_match = of_match_ptr("vbus"),
		.ops = &uniphier_regulator_ops,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.enable_reg = USB3VBUS_OFFSET,
		.enable_mask = USB3VBUS_REG_EN \| USB3VBUS_REG,
		.enable_val = USB3VBUS_REG_EN \| USB3VBUS_REG,
		.disable_val = USB3VBUS_REG_EN,
		};

		static const struct regmap_config uniphier_usb3_regulator_regconf = {
		.reg_bits = 32,
		.val_bits = 32,
		.reg_stride = 4,
		.max_register = 1,
		};

		static const char * const uniphier_pro4_clock_reset_names[] = {
		"gio", "link",
		};

		static const struct uniphier_regulator_soc_data uniphier_pro4_usb3_data = {
		.nclks = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
		.clock_names = uniphier_pro4_clock_reset_names,
		.nrsts = ARRAY_SIZE(uniphier_pro4_clock_reset_names),
		.reset_names = uniphier_pro4_clock_reset_names,
		.desc = &uniphier_usb3_regulator_desc,
		.regconf = &uniphier_usb3_regulator_regconf,
		};

		static const char * const uniphier_pxs2_clock_reset_names[] = {
		"link",
		};

		static const struct uniphier_regulator_soc_data uniphier_pxs2_usb3_data = {
		.nclks = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
		.clock_names = uniphier_pxs2_clock_reset_names,
		.nrsts = ARRAY_SIZE(uniphier_pxs2_clock_reset_names),
		.reset_names = uniphier_pxs2_clock_reset_names,
		.desc = &uniphier_usb3_regulator_desc,
		.regconf = &uniphier_usb3_regulator_regconf,
		};

		static const struct of_device_id uniphier_regulator_match[] = {
		/* USB VBUS */
		{
		.compatible = "socionext,uniphier-pro4-usb3-regulator",
		.data = &uniphier_pro4_usb3_data,
		},
		{
		.compatible = "socionext,uniphier-pxs2-usb3-regulator",
		.data = &uniphier_pxs2_usb3_data,
		},
		{
		.compatible = "socionext,uniphier-ld20-usb3-regulator",
		.data = &uniphier_pxs2_usb3_data,
		},
		{
		.compatible = "socionext,uniphier-pxs3-usb3-regulator",
		.data = &uniphier_pxs2_usb3_data,
		},
		{ /* Sentinel */ },
		};

		static struct platform_driver uniphier_regulator_driver = {
		.probe = uniphier_regulator_probe,
		.remove = uniphier_regulator_remove,
		.driver = {
		.name = "uniphier-regulator",
		.of_match_table = uniphier_regulator_match,
		},
		};
		module_platform_driver(uniphier_regulator_driver);

		MODULE_AUTHOR("Kunihiko Hayashi <hayashi.kunihiko@socionext.com>");
		MODULE_DESCRIPTION("UniPhier Regulator Controller Driver");
		MODULE_LICENSE("GPL");