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DT: leds: Improve description of flash LEDs related properties

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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>
This commit is contained in:
Jacek Anaszewski 2015-04-10 10:36:56 +02:00
parent c13dcf9f2d
commit aa14318aa0
1 changed files with 18 additions and 9 deletions
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27
Documentation/devicetree/bindings/leds/common.txt
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@ -29,14 +29,23 @@ Optional properties for child nodes:
"ide-disk" - LED indicates disk activity
"timer" - LED flashes at a fixed, configurable rate
- max-microamp : maximum intensity in microamperes of the LED
(torch LED for flash devices)
- flash-max-microamp : maximum intensity in microamperes of the
flash LED; it is mandatory if the LED should
support the flash mode
- flash-timeout-us : timeout in microseconds after which the flash
LED is turned off
- 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:
@ -49,7 +58,7 @@ system-status {
camera-flash {
label = "Flash";
led-sources = <0>, <1>;
max-microamp = <50000>;
led-max-microamp = <50000>;
flash-max-microamp = <320000>;
flash-timeout-us = <500000>;
flash-max-timeout-us = <500000>;
};