regulator: Add new driver for ST's PWM controlled voltage regulators (4a5d3013) · Commits · 戴 / test

drivers/regulator/Kconfig

+6 −0

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		@@ -432,6 +432,12 @@ config REGULATOR_S5M8767
		via I2C bus. S5M8767A have 9 Bucks and 28 LDOs output and
		supports DVS mode with 8bits of output voltage control.

		config REGULATOR_ST_PWM
		tristate "STMicroelectronics PWM voltage regulator"
		depends on ARCH_STI
		help
		This driver supports ST's PWM controlled voltage regulators.

		config REGULATOR_TI_ABB
		tristate "TI Adaptive Body Bias on-chip LDO"
		depends on ARCH_OMAP

drivers/regulator/Makefile

+1 −0

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		@@ -59,6 +59,7 @@ obj-$(CONFIG_REGULATOR_PCF50633) += pcf50633-regulator.o
		obj-$(CONFIG_REGULATOR_RC5T583) += rc5t583-regulator.o
		obj-$(CONFIG_REGULATOR_S2MPS11) += s2mps11.o
		obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
		obj-$(CONFIG_REGULATOR_ST_PWM) += st-pwm.o
		obj-$(CONFIG_REGULATOR_STW481X_VMMC) += stw481x-vmmc.o
		obj-$(CONFIG_REGULATOR_TI_ABB) += ti-abb-regulator.o
		obj-$(CONFIG_REGULATOR_TPS6105X) += tps6105x-regulator.o

drivers/regulator/st-pwm.c

0 → 100644

+193 −0

Original line number	Diff line number	Diff line
		/*
		* Regulator driver for ST's PWM Regulators
		*
		* Copyright (C) 2014 - STMicroelectronics Inc.
		*
		* Author: Lee Jones <lee.jones@linaro.org>
		*
		* This program is free software; you can redistribute it and/or modify
		* it under the terms of the GNU General Public License version 2 as
		* published by the Free Software Foundation.
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/err.h>
		#include <linux/regulator/driver.h>
		#include <linux/regulator/machine.h>
		#include <linux/regulator/of_regulator.h>
		#include <linux/of.h>
		#include <linux/of_device.h>
		#include <linux/pwm.h>

		#define ST_PWM_REG_PERIOD 8448

		struct st_pwm_regulator_pdata {
		const struct regulator_desc *desc;
		struct st_pwm_voltages *duty_cycle_table;
		};

		struct st_pwm_regulator_data {
		const struct st_pwm_regulator_pdata *pdata;
		struct pwm_device *pwm;
		bool enabled;
		int state;
		};

		struct st_pwm_voltages {
		unsigned int uV;
		unsigned int dutycycle;
		};

		static int st_pwm_regulator_get_voltage(struct regulator_dev *dev)
		{
		struct st_pwm_regulator_data *drvdata = rdev_get_drvdata(dev);

		return drvdata->pdata->duty_cycle_table[drvdata->state].uV;
		}

		static int st_pwm_regulator_set_voltage_sel(struct regulator_dev *dev,
		unsigned selector)
		{
		struct st_pwm_regulator_data *drvdata = rdev_get_drvdata(dev);
		int dutycycle;
		int ret;

		if (selector >= dev->desc->n_voltages)
		return -EINVAL;

		dutycycle = (ST_PWM_REG_PERIOD / 100) *
		drvdata->pdata->duty_cycle_table[selector].dutycycle;

		ret = pwm_config(drvdata->pwm, dutycycle, ST_PWM_REG_PERIOD);
		if (ret) {
		dev_err(&dev->dev, "Failed to configure PWM\n");
		return ret;
		}

		drvdata->state = selector;

		if (!drvdata->enabled) {
		ret = pwm_enable(drvdata->pwm);
		if (ret) {
		dev_err(&dev->dev, "Failed to enable PWM\n");
		return ret;
		}
		drvdata->enabled = true;
		}

		return 0;
		}

		static int st_pwm_regulator_list_voltage(struct regulator_dev *dev,
		unsigned selector)
		{
		struct st_pwm_regulator_data *drvdata = rdev_get_drvdata(dev);

		if (selector >= dev->desc->n_voltages)
		return -EINVAL;

		return drvdata->pdata->duty_cycle_table[selector].uV;
		}

		static struct regulator_ops st_pwm_regulator_voltage_ops = {
		.set_voltage_sel = st_pwm_regulator_set_voltage_sel,
		.get_voltage = st_pwm_regulator_get_voltage,
		.list_voltage = st_pwm_regulator_list_voltage,
		.map_voltage = regulator_map_voltage_iterate,
		};

		static struct st_pwm_voltages b2105_duty_cycle_table[] = {
		{ .uV = 1114000, .dutycycle = 0, },
		{ .uV = 1095000, .dutycycle = 10, },
		{ .uV = 1076000, .dutycycle = 20, },
		{ .uV = 1056000, .dutycycle = 30, },
		{ .uV = 1036000, .dutycycle = 40, },
		{ .uV = 1016000, .dutycycle = 50, },
		/* WARNING: Values above 50% duty-cycle cause boot failures. */
		};

		static const struct regulator_desc b2105_desc = {
		.name = "b2105-pwm-regulator",
		.ops = &st_pwm_regulator_voltage_ops,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
		.n_voltages = ARRAY_SIZE(b2105_duty_cycle_table),
		.supply_name = "pwm",
		};

		static const struct st_pwm_regulator_pdata b2105_info = {
		.desc = &b2105_desc,
		.duty_cycle_table = b2105_duty_cycle_table,
		};

		static struct of_device_id st_pwm_of_match[] = {
		{ .compatible = "st,b2105-pwm-regulator", .data = &b2105_info, },
		{ },
		};
		MODULE_DEVICE_TABLE(of, st_pwm_of_match);

		static int st_pwm_regulator_probe(struct platform_device *pdev)
		{
		struct st_pwm_regulator_data *drvdata;
		struct regulator_dev *regulator;
		struct regulator_config config = { };
		struct device_node *np = pdev->dev.of_node;
		const struct of_device_id *of_match;

		if (!np) {
		dev_err(&pdev->dev, "Device Tree node missing\n");
		return -EINVAL;
		}

		drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
		if (!drvdata)
		return -ENOMEM;

		of_match = of_match_device(st_pwm_of_match, &pdev->dev);
		if (!of_match) {
		dev_err(&pdev->dev, "failed to match of device\n");
		return -ENODEV;
		}
		drvdata->pdata = of_match->data;

		config.init_data = of_get_regulator_init_data(&pdev->dev, np);
		if (!config.init_data)
		return -ENOMEM;

		config.of_node = np;
		config.dev = &pdev->dev;
		config.driver_data = drvdata;

		drvdata->pwm = devm_pwm_get(&pdev->dev, NULL);
		if (IS_ERR(drvdata->pwm)) {
		dev_err(&pdev->dev, "Failed to get PWM\n");
		return PTR_ERR(drvdata->pwm);
		}

		regulator = devm_regulator_register(&pdev->dev,
		drvdata->pdata->desc, &config);
		if (IS_ERR(regulator)) {
		dev_err(&pdev->dev, "Failed to register regulator %s\n",
		drvdata->pdata->desc->name);
		return PTR_ERR(regulator);
		}

		return 0;
		}

		static struct platform_driver st_pwm_regulator_driver = {
		.driver = {
		.name = "st-pwm-regulator",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(st_pwm_of_match),
		},
		.probe = st_pwm_regulator_probe,
		};

		module_platform_driver(st_pwm_regulator_driver);

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org>");
		MODULE_DESCRIPTION("ST PWM Regulator Driver");
		MODULE_ALIAS("platform:st_pwm-regulator");

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