mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
aa14318aa0
1. Since max-microamp property has had no users so far, then rename it to more descriptive led-max-microamp. 2. Since flash-timeout-us property has had no users so far, then rename it to more accurate flash-max-timeout-us. 3. Describe led-max-microamp property as mandatory for specific board configurations. 4. Make flash-max-microamp and flash-max-timeout-us properties mandatory for devices with configurable flash current and flash timeout settings respectively. Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com> Cc: Richard Purdie <rpurdie@rpsys.net> Cc: Pavel Machek <pavel@ucw.cz> Cc: devicetree@vger.kernel.org Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Acked-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
65 lines
2.7 KiB
Plaintext
65 lines
2.7 KiB
Plaintext
Common leds properties.
|
|
|
|
LED and flash LED devices provide the same basic functionality as current
|
|
regulators, but extended with LED and flash LED specific features like
|
|
blinking patterns, flash timeout, flash faults and external flash strobe mode.
|
|
|
|
Many LED devices expose more than one current output that can be connected
|
|
to one or more discrete LED component. Since the arrangement of connections
|
|
can influence the way of the LED device initialization, the LED components
|
|
have to be tightly coupled with the LED device binding. They are represented
|
|
by child nodes of the parent LED device binding.
|
|
|
|
Optional properties for child nodes:
|
|
- led-sources : List of device current outputs the LED is connected to. The
|
|
outputs are identified by the numbers that must be defined
|
|
in the LED device binding documentation.
|
|
- label : The label for this LED. If omitted, the label is taken from the node
|
|
name (excluding the unit address). It has to uniquely identify
|
|
a device, i.e. no other LED class device can be assigned the same
|
|
label.
|
|
|
|
- linux,default-trigger : This parameter, if present, is a
|
|
string defining the trigger assigned to the LED. Current triggers are:
|
|
"backlight" - LED will act as a back-light, controlled by the framebuffer
|
|
system
|
|
"default-on" - LED will turn on (but for leds-gpio see "default-state"
|
|
property in Documentation/devicetree/bindings/gpio/led.txt)
|
|
"heartbeat" - LED "double" flashes at a load average based rate
|
|
"ide-disk" - LED indicates disk activity
|
|
"timer" - LED flashes at a fixed, configurable rate
|
|
|
|
- led-max-microamp : Maximum LED supply current in microamperes. This property
|
|
can be made mandatory for the board configurations
|
|
introducing a risk of hardware damage in case an excessive
|
|
current is set.
|
|
For flash LED controllers with configurable current this
|
|
property is mandatory for the LEDs in the non-flash modes
|
|
(e.g. torch or indicator).
|
|
|
|
Required properties for flash LED child nodes:
|
|
- flash-max-microamp : Maximum flash LED supply current in microamperes.
|
|
- flash-max-timeout-us : Maximum timeout in microseconds after which the flash
|
|
LED is turned off.
|
|
|
|
For controllers that have no configurable current the flash-max-microamp
|
|
property can be omitted.
|
|
For controllers that have no configurable timeout the flash-max-timeout-us
|
|
property can be omitted.
|
|
|
|
Examples:
|
|
|
|
system-status {
|
|
label = "Status";
|
|
linux,default-trigger = "heartbeat";
|
|
...
|
|
};
|
|
|
|
camera-flash {
|
|
label = "Flash";
|
|
led-sources = <0>, <1>;
|
|
led-max-microamp = <50000>;
|
|
flash-max-microamp = <320000>;
|
|
flash-max-timeout-us = <500000>;
|
|
};
|