linux-kernel - [PATCH v4 3/3] tegra: add pwm backlight device tree nodes

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Date:	Thu, 16 Aug 2012 15:08:57 +0900
From:	Alexandre Courbot <acourbot@...dia.com>
To:	Stephen Warren <swarren@...dia.com>,
	Thierry Reding <thierry.reding@...onic-design.de>,
	Simon Glass <sjg@...omium.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	Arnd Bergmann <arnd@...db.de>
CC:	Leela Krishna Amudala <leelakrishna.a@...il.com>,
	<linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-fbdev@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	Alexandre Courbot <acourbot@...dia.com>
Subject: [PATCH v4 3/3] tegra: add pwm backlight device tree nodes

Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
---
 arch/arm/boot/dts/tegra20-ventana.dts | 58 +++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/tegra20.dtsi        |  2 +-
 2 files changed, 59 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/tegra20-ventana.dts b/arch/arm/boot/dts/tegra20-ventana.dts
index be90544..b253697 100644
--- a/arch/arm/boot/dts/tegra20-ventana.dts
+++ b/arch/arm/boot/dts/tegra20-ventana.dts
@@ -317,6 +317,64 @@
 		bus-width = <8>;
 	};
 
+	backlight {
+		compatible = "pwm-backlight";
+		brightness-levels = <0 16 32 48 64 80 96 112 128 144 160 176 192 208 224 240 255>;
+		default-brightness-level = <12>;
+
+		/* resources used by the power sequences */
+		pwms = <&pwm 2 5000000>;
+		pwm-names = "backlight";
+		power-supply = <&backlight_reg>;
+		enable-gpio = <&gpio 28 0>;
+
+		power-on-sequence {
+			step0 {
+				regulator = "power";
+				enable;
+			};
+			step1 {
+				delay = <10000>;
+			};
+			step2 {
+				pwm = "backlight";
+				enable;
+			};
+			step3 {
+				gpio = "enable";
+				enable;
+			};
+		};
+		power-off-sequence {
+			step0 {
+				gpio = "enable";
+				disable;
+			};
+			step1 {
+				pwm = "backlight";
+				disable;
+			};
+			step2 {
+				delay = <10000>;
+			};
+			step3 {
+				regulator = "power";
+				disable;
+			};
+		};
+	};
+
+	backlight_reg: fixedregulator@176 {
+		compatible = "regulator-fixed";
+		regulator-name = "backlight_regulator";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		gpio = <&gpio 176 0>;
+		startup-delay-us = <0>;
+		enable-active-high;
+		regulator-boot-off;
+	};
+
 	sound {
 		compatible = "nvidia,tegra-audio-wm8903-ventana",
 			     "nvidia,tegra-audio-wm8903";
diff --git a/arch/arm/boot/dts/tegra20.dtsi b/arch/arm/boot/dts/tegra20.dtsi
index 405d167..67a6cd9 100644
--- a/arch/arm/boot/dts/tegra20.dtsi
+++ b/arch/arm/boot/dts/tegra20.dtsi
@@ -123,7 +123,7 @@
 		status = "disabled";
 	};
 
-	pwm {
+	pwm: pwm {
 		compatible = "nvidia,tegra20-pwm";
 		reg = <0x7000a000 0x100>;
 		#pwm-cells = <2>;
-- 
1.7.11.4

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