regulator: Add new driver for ST's PWM controlled voltage regulators

On some STMicroelectronics hardware reside regulators consisting
partly of a PWM input connected to the feedback loop. As the PWM
duty-cycle is varied the output voltage adapts. This driver
allows us to vary the output voltage by adapting the PWM input
duty-cycle.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index 6a7932822e373317caba9c5c799c9439f5444927..a6b29cbe8e2b6d86dc69da76700657c5b6f51e81 100644 (file)
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -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

diff --git a/drivers/regulator/Makefile b/drivers/regulator/Makefile
index 979f9ddcf259bd5a82b6b5d91f81981902e6185c..d0c2bb85b8cbfa68a8c9a819753f21a4f0cb6ed8 100644 (file)
--- a/drivers/regulator/Makefile
+++ b/drivers/regulator/Makefile
@@ -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

diff --git a/drivers/regulator/st-pwm.c b/drivers/regulator/st-pwm.c
new file mode 100644 (file)
index 0000000..6ef569f
--- /dev/null
+++ b/drivers/regulator/st-pwm.c
@@ -0,0 +1,193 @@
+/*
+ * 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");