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path: root/drivers/regulator/pwm-regulator.c
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Diffstat (limited to 'drivers/regulator/pwm-regulator.c')
-rw-r--r--drivers/regulator/pwm-regulator.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c
index 698c420e0869..60cfcd741c2a 100644
--- a/drivers/regulator/pwm-regulator.c
+++ b/drivers/regulator/pwm-regulator.c
@@ -157,7 +157,17 @@ static int pwm_regulator_get_voltage(struct regulator_dev *rdev)
pwm_get_state(drvdata->pwm, &pstate);
+ if (!pstate.enabled) {
+ if (pstate.polarity == PWM_POLARITY_INVERSED)
+ pstate.duty_cycle = pstate.period;
+ else
+ pstate.duty_cycle = 0;
+ }
+
voltage = pwm_get_relative_duty_cycle(&pstate, duty_unit);
+ if (voltage < min(max_uV_duty, min_uV_duty) ||
+ voltage > max(max_uV_duty, min_uV_duty))
+ return -ENOTRECOVERABLE;
/*
* The dutycycle for min_uV might be greater than the one for max_uV.
@@ -313,6 +323,32 @@ static int pwm_regulator_init_continuous(struct platform_device *pdev,
return 0;
}
+static int pwm_regulator_init_boot_on(struct platform_device *pdev,
+ struct pwm_regulator_data *drvdata,
+ const struct regulator_init_data *init_data)
+{
+ struct pwm_state pstate;
+
+ if (!init_data->constraints.boot_on || drvdata->enb_gpio)
+ return 0;
+
+ pwm_get_state(drvdata->pwm, &pstate);
+ if (pstate.enabled)
+ return 0;
+
+ /*
+ * Update the duty cycle so the output does not change
+ * when the regulator core enables the regulator (and
+ * thus the PWM channel).
+ */
+ if (pstate.polarity == PWM_POLARITY_INVERSED)
+ pstate.duty_cycle = pstate.period;
+ else
+ pstate.duty_cycle = 0;
+
+ return pwm_apply_might_sleep(drvdata->pwm, &pstate);
+}
+
static int pwm_regulator_probe(struct platform_device *pdev)
{
const struct regulator_init_data *init_data;
@@ -372,6 +408,13 @@ static int pwm_regulator_probe(struct platform_device *pdev)
if (ret)
return ret;
+ ret = pwm_regulator_init_boot_on(pdev, drvdata, init_data);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to apply boot_on settings: %d\n",
+ ret);
+ return ret;
+ }
+
regulator = devm_regulator_register(&pdev->dev,
&drvdata->desc, &config);
if (IS_ERR(regulator)) {