@@ -32,16 +32,21 @@ static int pwm_backlight_enable(struct udevice *dev)
uint duty_cycle;
int ret;
- plat = dev_get_uclass_platdata(priv->reg);
- debug("%s: Enable '%s', regulator '%s'/'%s'\n", __func__, dev->name,
- priv->reg->name, plat->name);
- ret = regulator_set_enable(priv->reg, true);
- if (ret) {
- debug("%s: Cannot enable regulator for PWM '%s'\n", __func__,
- dev->name);
- return ret;
+ if (priv->reg) {
+ plat = dev_get_uclass_platdata(priv->reg);
+ debug("%s: Enable '%s', regulator '%s'/'%s'\n", __func__, dev->name,
+ priv->reg->name, plat->name);
+ ret = regulator_set_enable(priv->reg, true);
+ if (ret) {
+ debug("%s: Cannot enable regulator for PWM '%s'\n", __func__,
+ dev->name);
+ return ret;
+ }
+ mdelay(120);
}
- mdelay(120);
+
+ debug("%s: default: %d, min: %d, max: %d\n", __func__,
+ priv->default_level, priv->min_level, priv->max_level);
duty_cycle = priv->period_ns * (priv->default_level - priv->min_level) /
(priv->max_level - priv->min_level + 1);
@@ -68,10 +73,9 @@ static int pwm_backlight_ofdata_to_platdata(struct udevice *dev)
debug("%s: start\n", __func__);
ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
"power-supply", &priv->reg);
- if (ret) {
+ if (ret)
debug("%s: Cannot get power supply: ret=%d\n", __func__, ret);
- return ret;
- }
+
ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
GPIOD_IS_OUT);
if (ret) {
u-boot doesn't have dummy regulators, so pwm_backlight probe will fail if regulator is missing. Make it optional to get this driver working on platforms where there's no backlight regultor. Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com> --- drivers/video/pwm_backlight.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-)