linux-kernel - [PATCH 4/4] devicetree: Add led-backlight binding

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Date:   Mon, 1 Jul 2019 17:14:23 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...com>
To:     <jacek.anaszewski@...il.com>, <pavel@....cz>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <lee.jones@...aro.org>,
        <daniel.thompson@...aro.org>, <jingoohan1@...il.com>
CC:     <dmurphy@...com>, <linux-leds@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <tomi.valkeinen@...com>, Jean-Jacques Hiblot <jjhiblot@...com>,
        <devicetree@...r.kernel.org>
Subject: [PATCH 4/4] devicetree: Add led-backlight binding

From: Tomi Valkeinen <tomi.valkeinen@...com>

Add DT binding for led-backlight.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>
Cc: devicetree@...r.kernel.org
---
 .../video/backlight/led-backlight.txt         | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/video/backlight/led-backlight.txt

diff --git a/Documentation/devicetree/bindings/video/backlight/led-backlight.txt b/Documentation/devicetree/bindings/video/backlight/led-backlight.txt
new file mode 100644
index 000000000000..216cd52d624a
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/led-backlight.txt
@@ -0,0 +1,39 @@
+led-backlight bindings
+
+The node of the backlight driver IS the node of the LED.
+
+Required properties:
+  - compatible: "led-backlight"
+  - brightness-levels: Array of distinct LED brightness levels. These
+      are in the range from 0 to 255, passed to the LED class driver.
+  - default-brightness-level: the default brightness level (index into the
+      array defined by the "brightness-levels" property)
+
+Optional properties:
+  - power-supply: regulator for supply voltage
+  - enable-gpios: contains a single GPIO specifier for the GPIO which enables
+                  and disables the backlight (see GPIO binding[0])
+
+[0]: Documentation/devicetree/bindings/gpio/gpio.txt
+
+Example:
+
+led_ctrl {
+	red_led@1 {
+	        label = "red";
+		reg = <1>;
+	}
+
+	backlight_led@2 {
+		function = LED_FUNCTION_BACKLIGHT;
+		reg = <2>;
+
+		compatible = "led-backlight";
+
+		brightness-levels = <0 4 8 16 32 64 128 255>;
+		default-brightness-level = <6>;
+
+		power-supply = <&vdd_bl_reg>;
+		enable-gpios = <&gpio 58 0>;
+	};
+};
-- 
2.17.1