From 1de7d80246a047edaa4ea7de225437571a3aec34 Mon Sep 17 00:00:00 2001 From: Boris Brezillon Date: Mon, 21 Sep 2015 11:33:28 +0200 Subject: [PATCH] regulator: pwm: implement ->enable(), ->disable() and ->is_enabled methods Implement the ->enable(), ->disable() and ->is_enabled methods and remove the PWM call in ->set_voltage_sel(). This is particularly important for critical regulators tagged as always-on, because not claiming the PWM (and its dependencies) might lead to unpredictable behavior (like a system hang because the PWM clk is only claimed when the PWM device is enabled). Signed-off-by: Boris Brezillon Signed-off-by: Mark Brown --- drivers/regulator/pwm-regulator.c | 35 +++++++++++++++++++++++++------ 1 file changed, 29 insertions(+), 6 deletions(-) diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index fc3166dfcbfa..3aca067b9901 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -69,12 +69,6 @@ static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev, drvdata->state = selector; - ret = pwm_enable(drvdata->pwm); - if (ret) { - dev_err(&rdev->dev, "Failed to enable PWM\n"); - return ret; - } - return 0; } @@ -89,6 +83,29 @@ static int pwm_regulator_list_voltage(struct regulator_dev *rdev, return drvdata->duty_cycle_table[selector].uV; } +static int pwm_regulator_enable(struct regulator_dev *dev) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev); + + return pwm_enable(drvdata->pwm); +} + +static int pwm_regulator_disable(struct regulator_dev *dev) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev); + + pwm_disable(drvdata->pwm); + + return 0; +} + +static int pwm_regulator_is_enabled(struct regulator_dev *dev) +{ + struct pwm_regulator_data *drvdata = rdev_get_drvdata(dev); + + return pwm_is_enabled(drvdata->pwm); +} + /** * Continuous voltage call-backs */ @@ -144,11 +161,17 @@ static struct regulator_ops pwm_regulator_voltage_table_ops = { .get_voltage_sel = pwm_regulator_get_voltage_sel, .list_voltage = pwm_regulator_list_voltage, .map_voltage = regulator_map_voltage_iterate, + .enable = pwm_regulator_enable, + .disable = pwm_regulator_disable, + .is_enabled = pwm_regulator_is_enabled, }; static struct regulator_ops pwm_regulator_voltage_continuous_ops = { .get_voltage = pwm_regulator_get_voltage, .set_voltage = pwm_regulator_set_voltage, + .enable = pwm_regulator_enable, + .disable = pwm_regulator_disable, + .is_enabled = pwm_regulator_is_enabled, }; static struct regulator_desc pwm_regulator_desc = { -- 2.20.1