Groups > linux.kernel > #1719772

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

Path	csiph.com!aioe.org!bofh.it!news.nic.it!robomod
From	Andrew Jeffery <andrew@aj.id.au>
Newsgroups	linux.kernel
Subject	[PATCH 1/2] dt-bindings: leds: gpio: Add optional retain-state-shutdown property
Date	Fri, 25 Aug 2017 08:40:01 +0200
Message-ID	<uigrD-xp-5@gated-at.bofh.it> (permalink)
References	<uigrD-xp-7@gated-at.bofh.it>
Dkim-Signature	v=1; a=rsa-sha256; c=relaxed/relaxed; d=aj.id.au; h=cc :date:from:in-reply-to:message-id:references:subject:to :x-me-sender:x-me-sender:x-sasl-enc:x-sasl-enc; s=fm1; bh=NcTUM4 EhpW7ne/3uFo+obaqRQHcFXtOdywhZSzQTpRM=; b=kqLC+EK8SWqx9CgaEjsIZx cnqYOvU4+nGYCM9LyucVFPAtf7QmulTYF9nx06NolRdOlAcZ6X5zB/xgdn/Mo4py zZ8UKMQJHQ3WpxWXMrQuZ+JRBvMe1EpjkYVRGqW6UmezLPXWvchebBTH5Zrj5Dfu 6BFNZmBqNcQry0IH1mLCw/zNowU/+4YTY4bWs/MyfZUroVcJJ1AyOH2vhUrz/w3d YnMqJFmevPCqqWvCEkXh4kWGBss7DArqUiWEYW038bc1w8lATXGkZqnZfQj5JFrk OYn62lc+uPRZlQXv5klLcS5lMJTcrxCk/5MtIj5R6sVX73ORZLqRsi4nEKCqvY7Q ==
Dkim-Signature	v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:date:from:in-reply-to:message-id :references:subject:to:x-me-sender:x-me-sender:x-sasl-enc :x-sasl-enc; s=fm1; bh=NcTUM4EhpW7ne/3uFo+obaqRQHcFXtOdywhZSzQTp RM=; b=QM464gPSgVo5/00yUz4RK5/AK+w4b9QhnJSH5APH9X/cQDnnqgo3tkpFG WsaZLJ4lDZsuk79NliwLgVtHUgXMvKj2HtTBqz62DriRKAV1LplKXopeYzH3pwZK +sp7mi2k32gZQBnQpV7fSai++xXeSGywGOyFQnmdpR+QOnc0K0myxf1dC7UkDwLz 9dPDDzt17BsSoysK/8w4PelXBuebKxVsn3amgS+72BK7XITr9Wido2lI+k6RxB/k Y6MR8SIt/jVVR1Dw1quagVaytVUWGnBSNDsbKCTyXuvEaga8Xz716zx5fdNxRiCF pFG12gf9P0DyrRmzjzPVv9Hf31yuA==
X-Me-Sender	<xms:VMWfWWCZ7yHYdH-pyREz1oJXxVHBZ1UDpNE3_aqwYMwuEcRtS8jGug>
X-Sasl-Enc	JzDY7hYVZZSzW2hiCXhbgCZ2kQvemiy5xwYzOJzvPEGD 1503642963
X-Mailer	git-send-email 2.11.0
Sender	robomod@news.nic.it
List-ID	<linux-kernel.vger.kernel.org>
X-Mailing-List	linux-kernel@vger.kernel.org
Approved	robomod@news.nic.it
Lines	26
Organization	linux.* mail to news gateway
X-Original-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
X-Original-Date	Fri, 25 Aug 2017 16:05:02 +0930
X-Original-Message-ID	<20170825063503.31577-2-andrew@aj.id.au>
X-Original-References	<20170825063503.31577-1-andrew@aj.id.au>
X-Original-Sender	linux-kernel-owner@vger.kernel.org
Xref	csiph.com linux.kernel:1719772

Show key headers only | View raw

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

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

[PATCH 1/2] dt-bindings: leds: gpio: Add optional retain-state-shutdown property Andrew Jeffery <andrew@aj.id.au> - 2017-08-25 08:40 +0200

csiph-web