Commit 7cd7a299 authored by Astrid Rost's avatar Astrid Rost Committed by Lee Jones
Browse files

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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarAstrid Rost <astrid.rost@axis.com>
Acked-by: default avatarJacek Anaszewski <jacek.anaszewski@gmail.com>
Link: https://lore.kernel.org/r/20230703130313.548519-3-astrid.rost@axis.com


Signed-off-by: default avatarLee Jones <lee@kernel.org>
parent 713899c0

drivers/leds/led-class.c

+4 −0
Original line number Diff line number Diff line
@@ -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;