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Date: Wed, 17 Sep 2014 21:07:59 +0800
From: Chris Zhong <zyw@...k-chips.com>
To: dianders@...omium.org, heiko@...ech.de
Cc: huangtao@...k-chips.com, cf@...k-chips.com,
zhangqing@...k-chips.com, Chris Zhong <zyw@...k-chips.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] regulator: st-pwm: get voltage and duty table from dts
Get voltage & duty table from device tree might be better, other platforms can also use this
driver without any modify.
Signed-off-by: Chris Zhong <zyw@...k-chips.com>
---
drivers/regulator/Kconfig | 1 -
drivers/regulator/st-pwm.c | 80 +++++++++++++++++++++++---------------------
2 files changed, 42 insertions(+), 39 deletions(-)
diff --git a/drivers/regulator/Kconfig b/drivers/regulator/Kconfig
index fb32bab..06a9632 100644
--- a/drivers/regulator/Kconfig
+++ b/drivers/regulator/Kconfig
@@ -495,7 +495,6 @@ config REGULATOR_S5M8767
config REGULATOR_ST_PWM
tristate "STMicroelectronics PWM voltage regulator"
- depends on ARCH_STI
help
This driver supports ST's PWM controlled voltage regulators.
diff --git a/drivers/regulator/st-pwm.c b/drivers/regulator/st-pwm.c
index 5ea78df..877381b 100644
--- a/drivers/regulator/st-pwm.c
+++ b/drivers/regulator/st-pwm.c
@@ -20,16 +20,11 @@
#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 regulator_desc *desc;
+ struct st_pwm_voltages *duty_cycle_table;
struct pwm_device *pwm;
+ int pwm_reg_period;
bool enabled;
int state;
};
@@ -53,10 +48,10 @@ static int st_pwm_regulator_set_voltage_sel(struct regulator_dev *dev,
int dutycycle;
int ret;
- dutycycle = (ST_PWM_REG_PERIOD / 100) *
- drvdata->pdata->duty_cycle_table[selector].dutycycle;
+ dutycycle = (drvdata->pwm_reg_period / 100) *
+ drvdata->duty_cycle_table[selector].dutycycle;
- ret = pwm_config(drvdata->pwm, dutycycle, ST_PWM_REG_PERIOD);
+ ret = pwm_config(drvdata->pwm, dutycycle, drvdata->pwm_reg_period);
if (ret) {
dev_err(&dev->dev, "Failed to configure PWM\n");
return ret;
@@ -84,7 +79,7 @@ static int st_pwm_regulator_list_voltage(struct regulator_dev *dev,
if (selector >= dev->desc->n_voltages)
return -EINVAL;
- return drvdata->pdata->duty_cycle_table[selector].uV;
+ return drvdata->duty_cycle_table[selector].uV;
}
static struct regulator_ops st_pwm_regulator_voltage_ops = {
@@ -94,32 +89,16 @@ static struct regulator_ops st_pwm_regulator_voltage_ops = {
.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 = {
+static 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 const struct of_device_id st_pwm_of_match[] = {
- { .compatible = "st,b2105-pwm-regulator", .data = &b2105_info, },
+ { .compatible = "st,b2105-pwm-regulator" },
{ },
};
MODULE_DEVICE_TABLE(of, st_pwm_of_match);
@@ -127,10 +106,11 @@ 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 property *prop;
struct regulator_dev *regulator;
struct regulator_config config = { };
struct device_node *np = pdev->dev.of_node;
- const struct of_device_id *of_match;
+ int length, ret;
if (!np) {
dev_err(&pdev->dev, "Device Tree node missing\n");
@@ -141,12 +121,36 @@ static int st_pwm_regulator_probe(struct platform_device *pdev)
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->desc = &b2105_desc;
+
+ /* determine the number of voltage-table */
+ prop = of_find_property(np, "voltage-table", &length);
+ if (!prop)
+ return -EINVAL;
+
+ drvdata->desc->n_voltages = length / sizeof(*drvdata->duty_cycle_table);
+
+ /* read voltage table from DT property */
+ if (length > 0) {
+ size_t size = sizeof(*drvdata->duty_cycle_table) *
+ drvdata->desc->n_voltages;
+
+ drvdata->duty_cycle_table = devm_kzalloc(&pdev->dev,
+ size, GFP_KERNEL);
+ if (!drvdata->duty_cycle_table)
+ return -ENOMEM;
+
+ ret = of_property_read_u32_array(np, "voltage-table",
+ (u32 *)drvdata->duty_cycle_table,
+ length / sizeof(u32));
+ if (ret < 0)
+ return ret;
}
- drvdata->pdata = of_match->data;
+
+ ret = of_property_read_u32(np, "pwm-reg-period",
+ &drvdata->pwm_reg_period);
+ if (ret)
+ return -EINVAL;
config.init_data = of_get_regulator_init_data(&pdev->dev, np);
if (!config.init_data)
@@ -163,10 +167,10 @@ static int st_pwm_regulator_probe(struct platform_device *pdev)
}
regulator = devm_regulator_register(&pdev->dev,
- drvdata->pdata->desc, &config);
+ drvdata->desc, &config);
if (IS_ERR(regulator)) {
dev_err(&pdev->dev, "Failed to register regulator %s\n",
- drvdata->pdata->desc->name);
+ drvdata->desc->name);
return PTR_ERR(regulator);
}
--
1.7.9.5
--
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