diff options
-rw-r--r-- | drivers/video/backlight-pwm.c | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/drivers/video/backlight-pwm.c b/drivers/video/backlight-pwm.c index 5ff40a94c3..7f1715ddde 100644 --- a/drivers/video/backlight-pwm.c +++ b/drivers/video/backlight-pwm.c @@ -128,6 +128,13 @@ static int pwm_backlight_parse_dt(struct device_d *dev, if (!node) return -ENODEV; + ret = of_property_read_u32(node, "default-brightness-level", + &value); + if (ret < 0) + return ret; + + pwm_backlight->backlight.brightness_default = value; + /* determine the number of brightness levels */ prop = of_find_property(node, "brightness-levels", &length); if (!prop) @@ -153,14 +160,13 @@ static int pwm_backlight_parse_dt(struct device_d *dev, if (pwm_backlight->levels[i] > pwm_backlight->scale) pwm_backlight->scale = pwm_backlight->levels[i]; - ret = of_property_read_u32(node, "default-brightness-level", - &value); - if (ret < 0) - return ret; - - pwm_backlight->backlight.brightness_default = value; - pwm_backlight->backlight.brightness_max = pwm_backlight->scale; + if (pwm_backlight->scale == 0) + return -EINVAL; + } else { + /* We implicitly assume here a linear levels array { 0, 1, 2, ... 100 } */ + pwm_backlight->scale = 100; } + pwm_backlight->backlight.brightness_max = pwm_backlight->scale; pwm_backlight->enable_gpio = of_get_named_gpio_flags(node, "enable-gpios", 0, &flags); |