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(-)
diff --git a/drivers/video/pwm_backlight.c b/drivers/video/pwm_backlight.c index fbd7bf7838..05e56ffead 100644 --- a/drivers/video/pwm_backlight.c +++ b/drivers/video/pwm_backlight.c @@ -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) {