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 1/2] dt-bindings: leds: gpio: Add optional retain-state-shutdown property
Date: Fri, 25 Aug 2017 16:05:02 +0930 [thread overview]
Message-ID: <20170825063503.31577-2-andrew@aj.id.au> (raw)
In-Reply-To: <20170825063503.31577-1-andrew@aj.id.au>
On 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:[~2017-08-25 6:35 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-25 6:35 [PATCH 0/2] leds: gpio: Allow retaining state on shutdown Andrew Jeffery
2017-08-25 6:35 ` Andrew Jeffery [this message]
2017-08-25 6:35 ` [PATCH 2/2] leds: gpio: Allow LED to retain state at shutdown Andrew Jeffery
2017-08-25 7:32 ` Pavel Machek
2017-08-27 11:01 ` Jacek Anaszewski
[not found] ` <3b89ad70-7024-b4ac-bf4e-49a02d12da51-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2017-08-28 0:00 ` Andrew Jeffery
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