Linux-LEDs Archive on lore.kernel.org
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From: Jean-Jacques Hiblot <jjhiblot@ti.com>
To: <jacek.anaszewski@gmail.com>, <pavel@ucw.cz>,
	<robh+dt@kernel.org>, <mark.rutland@arm.com>,
	<daniel.thompson@linaro.org>
Cc: <dmurphy@ti.com>, <linux-leds@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <devicetree@vger.kernel.org>,
	Jean-Jacques Hiblot <jjhiblot@ti.com>
Subject: [PATCH v2 1/2] dt-bindings: leds: document the "power-supply" property
Date: Mon, 15 Jul 2019 17:56:56 +0200
Message-ID: <20190715155657.22976-2-jjhiblot@ti.com> (raw)
In-Reply-To: <20190715155657.22976-1-jjhiblot@ti.com>

Most of the LEDs are powered by a voltage/current regulator. Describing it
in the device-tree makes it possible for the LED core to enable/disable it
when needed.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
---
 Documentation/devicetree/bindings/leds/common.txt | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
index 70876ac11367..539e124b1457 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt
@@ -61,6 +61,11 @@ Optional properties for child nodes:
 - panic-indicator : This property specifies that the LED should be used,
 		    if at all possible, as a panic indicator.
 
+- power-supply : A voltage/current regulator used to to power the LED. When a
+		 LED is turned off, the LED core disable its regulator. The
+		 same regulator can power many LED (or other) devices. It is
+		 turned off only when all of its users disabled it.
+
 - trigger-sources : List of devices which should be used as a source triggering
 		    this LED activity. Some LEDs can be related to a specific
 		    device and should somehow indicate its state. E.g. USB 2.0
@@ -106,6 +111,7 @@ gpio-leds {
 		label = "Status";
 		linux,default-trigger = "heartbeat";
 		gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
+		power-supply = <&led_regulator>;
 	};
 
 	usb {
-- 
2.17.1


  reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-15 15:56 [PATCH v2 0/2] leds: Add control of the voltage/current regulator to the LED core Jean-Jacques Hiblot
2019-07-15 15:56 ` Jean-Jacques Hiblot [this message]
2019-07-15 18:52   ` [PATCH v2 1/2] dt-bindings: leds: document the "power-supply" property Dan Murphy
2019-08-19 11:31   ` Pavel Machek
2019-07-15 15:56 ` [PATCH v2 2/2] leds: Add control of the voltage/current regulator to the LED core Jean-Jacques Hiblot
2019-07-15 18:59   ` Dan Murphy
2019-07-17 13:14     ` Jean-Jacques Hiblot
2019-07-15 20:42   ` Jacek Anaszewski
2019-07-17 13:23     ` Jean-Jacques Hiblot
2019-07-16 10:50   ` Daniel Thompson
2019-07-17 13:47     ` Jean-Jacques Hiblot

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