diff options
| author | Astrid Rost <astrid.rost@axis.com> | 2023-07-03 15:03:13 +0200 |
|---|---|---|
| committer | Lee Jones <lee@kernel.org> | 2023-07-28 09:26:22 +0100 |
| commit | 7cd7a2995ecde065a486e077deb002426975fa40 (patch) | |
| tree | d57d18432d6bc206ff4065ce7761327c686f3cc0 | |
| parent | 713899c0627c440851a543b36b0ffe36fade2622 (diff) | |
| download | linux-7cd7a2995ecde065a486e077deb002426975fa40.tar.gz linux-7cd7a2995ecde065a486e077deb002426975fa40.tar.bz2 linux-7cd7a2995ecde065a486e077deb002426975fa40.zip | |
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 <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>
| -rw-r--r-- | drivers/leds/led-class.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c index 6dae56b914fe..4758da2b59cf 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; |