diff options
| author | Alexandre Courbot <acourbot@nvidia.com> | 2016-06-23 16:39:44 +0900 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-06-23 11:34:35 +0100 |
| commit | 27bfa8893b15a3fa22a593c90a48c8bcb1f9c75b (patch) | |
| tree | 1b309e0c66596fcc8c7c9163cc41cb51a47c1664 /drivers/regulator | |
| parent | 830583004e615a4637eacc77866b84908414d7a0 (diff) | |
| download | linux-27bfa8893b15a3fa22a593c90a48c8bcb1f9c75b.tar.gz | |
regulator: pwm: Support for enable GPIO
Add an optional enable GPIO to the pwm-regulator driver. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator')
| -rw-r--r-- | drivers/regulator/pwm-regulator.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index ab3cc0235843..90f8b7fd0437 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -20,6 +20,7 @@ #include <linux/of.h> #include <linux/of_device.h> #include <linux/pwm.h> +#include <linux/gpio/consumer.h> struct pwm_regulator_data { /* Shared */ @@ -38,6 +39,9 @@ struct pwm_regulator_data { /* Continuous voltage */ int volt_uV; + + /* Enable GPIO */ + struct gpio_desc *enb_gpio; }; struct pwm_voltages { @@ -94,6 +98,9 @@ static int pwm_regulator_enable(struct regulator_dev *dev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev); + if (drvdata->enb_gpio) + gpiod_set_value_cansleep(drvdata->enb_gpio, 1); + return pwm_enable(drvdata->pwm); } @@ -103,6 +110,9 @@ static int pwm_regulator_disable(struct regulator_dev *dev) pwm_disable(drvdata->pwm); + if (drvdata->enb_gpio) + gpiod_set_value_cansleep(drvdata->enb_gpio, 0); + return 0; } @@ -110,6 +120,9 @@ static int pwm_regulator_is_enabled(struct regulator_dev *dev) { struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev); + if (drvdata->enb_gpio && !gpiod_get_value_cansleep(drvdata->enb_gpio)) + return false; + return pwm_is_enabled(drvdata->pwm); } @@ -248,6 +261,7 @@ static int pwm_regulator_probe(struct platform_device *pdev) struct regulator_dev *regulator; struct regulator_config config = { }; struct device_node *np = pdev->dev.of_node; + enum gpiod_flags gpio_flags; int ret; if (!np) { @@ -285,6 +299,18 @@ static int pwm_regulator_probe(struct platform_device *pdev) return ret; } + if (init_data->constraints.boot_on || init_data->constraints.always_on) + gpio_flags = GPIOD_OUT_HIGH; + else + gpio_flags = GPIOD_OUT_LOW; + drvdata->enb_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", + gpio_flags); + if (IS_ERR(drvdata->enb_gpio)) { + ret = PTR_ERR(drvdata->enb_gpio); + dev_err(&pdev->dev, "Failed to get enable GPIO: %d\n", ret); + return ret; + } + /* * FIXME: pwm_apply_args() should be removed when switching to the * atomic PWM API. |