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dt-bindings: leds: gpio: Add optional retain-state-shutdown property 

On Baseboard Management Controller (BMC) systems it's sometimes
necessary for a LED to retain its state across a BMC reset (which is
independent of the host system state). Add a devicetree property to
describe this behaviour. The property would typically be used in
conjunction with 'default-state = "keep"'.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Acked-by: Pavel Machek <pavel@ucw.cz>
Tested-by: Brandon Wyman <bjwyman@gmail.com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Andrew Jeffery 2017-08-28 09:47:10 +09:30 committed by Jacek Anaszewski
parent 30f21ef22b
commit 0f34f95876
1 changed files with 3 additions and 0 deletions
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Documentation/devicetree/bindings/leds/leds-gpio.txt
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@ -18,6 +18,9 @@ LED sub-node properties:
see Documentation/devicetree/bindings/leds/common.txt
- retain-state-suspended: (optional) The suspend state can be retained.Such
as charge-led gpio.
- retain-state-shutdown: (optional) Retain the state of the LED on shutdown.
Useful in BMC systems, for example when the BMC is rebooted while the host
remains up.
- panic-indicator : (optional)
see Documentation/devicetree/bindings/leds/common.txt