From: Astrid Rost Date: Mon, 3 Jul 2023 13:03:13 +0000 (+0200) Subject: led: led-class: Read max-brightness from devicetree X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7cd7a2995ecde065a486e077deb002426975fa40;p=linux.git led: led-class: Read max-brightness from devicetree Normally, the maximum brightness is determined by the hardware, and this property is not required. This property is used to set a software limit. It could happen that an LED is made so bright that it gets damaged or causes damage due to restrictions in a specific system, such as mounting conditions. Note that this flag is mainly used for PWM-LEDs, where it is not possible to map brightness to current. Drivers for other controllers should use led-max-microamp. Reviewed-by: Andy Shevchenko Signed-off-by: Astrid Rost Acked-by: Jacek Anaszewski Link: https://lore.kernel.org/r/20230703130313.548519-3-astrid.rost@axis.com Signed-off-by: Lee Jones --- diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 6dae56b914fe3..4758da2b59cf6 100644 --- a/drivers/leds/led-class.c +++ b/drivers/leds/led-class.c @@ -457,6 +457,10 @@ int led_classdev_register_ext(struct device *parent, if (fwnode_property_present(init_data->fwnode, "retain-state-shutdown")) led_cdev->flags |= LED_RETAIN_AT_SHUTDOWN; + + fwnode_property_read_u32(init_data->fwnode, + "max-brightness", + &led_cdev->max_brightness); } } else { proposed_name = led_cdev->name;