From: Andrew Jeffery <andrew@aj.id.au>
To: linux-leds@vger.kernel.org
Cc: Andrew Jeffery <andrew@aj.id.au>,
rpurdie@rpsys.net, jacek.anaszewski@gmail.com, pavel@ucw.cz,
robh+dt@kernel.org, mark.rutland@arm.com,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
joel@jms.id.au, openbmc@lists.ozlabs.org
Subject: [PATCH v2 1/2] dt-bindings: leds: gpio: Add optional retain-state-shutdown property
Date: Mon, 28 Aug 2017 09:47:10 +0930 [thread overview]
Message-ID: <20170828001711.19662-2-andrew@aj.id.au> (raw)
In-Reply-To: <20170828001711.19662-1-andrew@aj.id.au>
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>
---
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
next prev parent reply other threads:[~2017-08-28 0:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-28 0:17 [PATCH v2 0/2] leds: gpio: Allow retaining state on shutdown Andrew Jeffery
2017-08-28 0:17 ` Andrew Jeffery [this message]
2017-08-28 10:19 ` [PATCH v2 1/2] dt-bindings: leds: gpio: Add optional retain-state-shutdown property Pavel Machek
2017-08-28 21:13 ` Brandon Wyman
[not found] ` <CAK_vbW2BJjKa0dKoVjbRE++-2VB+3fM0DQ7u3DnwD2Tj-4bY7w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-08-29 19:13 ` Jacek Anaszewski
2017-08-31 21:28 ` Rob Herring
2017-08-31 23:02 ` Andrew Jeffery
2017-09-05 19:10 ` Jacek Anaszewski
[not found] ` <20170828001711.19662-1-andrew-zrmu5oMJ5Fs@public.gmane.org>
2017-08-28 0:17 ` [PATCH v2 2/2] leds: gpio: Allow LED to retain state at shutdown Andrew Jeffery
2017-08-28 20:22 ` [PATCH v2 0/2] leds: gpio: Allow retaining state on shutdown Jacek Anaszewski
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