linux-kernel - [PATCH v2 1/2] dt-bindings: leds: gpio: Add optional retain-state-shutdown property

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Date:   Mon, 28 Aug 2017 09:47:10 +0930
From:   Andrew Jeffery <andrew@...id.au>
To:     linux-leds@...r.kernel.org
Cc:     Andrew Jeffery <andrew@...id.au>, rpurdie@...ys.net,
        jacek.anaszewski@...il.com, pavel@....cz, robh+dt@...nel.org,
        mark.rutland@....com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, joel@....id.au,
        openbmc@...ts.ozlabs.org
Subject: [PATCH v2 1/2] 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@...id.au>
---
 Documentation/devicetree/bindings/leds/leds-gpio.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/leds-gpio.txt b/Documentation/devicetree/bindings/leds/leds-gpio.txt
index 76535ca37120..a48dda268f81 100644
--- a/Documentation/devicetree/bindings/leds/leds-gpio.txt
+++ b/Documentation/devicetree/bindings/leds/leds-gpio.txt
@@ -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
 
-- 
2.11.0