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led: led-class: Read max-brightness from devicetree

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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 <andriy.shevchenko@linux.intel.com>
Signed-off-by: Astrid Rost <astrid.rost@axis.com>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Link: https://lore.kernel.org/r/20230703130313.548519-3-astrid.rost@axis.com
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Astrid Rost 2023-07-03 15:03:13 +02:00 committed by Lee Jones
parent 713899c062
commit 7cd7a2995e
1 changed files with 4 additions and 0 deletions
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4
drivers/leds/led-class.c
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@ -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;