ARM: dts: Add board dts file for Snow board (ARM Chromebook)

This dts file is based on the Snow dts file in the Chromium OS kernel
tree with the following changes:
* Some details have been updated to match the exynos5250-smdk5250.dts
  file from linux-next (as of c11068538994430547722dc9fb515a0ceefd5cb9).
* This file doesn't include references to hardware whose upstream
  support isn't quite there yet.  That includes most i2c devices.
  Note that most i2c busses have been included with no devices.

The Snow dts file is mostly just an include of the "cros5250" dts file
which describes a class of similar boards. Support for other boards has
not yet been send upstream.

With this file and a change to use UART3 for serial output I can:
* Boot to a command line using either SD or EMMC as a root filesystem
* See the power button and lid switch using evtest.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/Makefile

@@ -24,7 +24,8 @@ dtb-$(CONFIG_ARCH_EXYNOS) += exynos4210-origen.dtb \
 	exynos4210-smdkv310.dtb \
 	exynos4210-trats.dtb \
 	exynos4412-smdk4412.dtb \
-	exynos5250-smdk5250.dtb
+	exynos5250-smdk5250.dtb \
+	exynos5250-snow.dtb
 dtb-$(CONFIG_ARCH_HIGHBANK) += highbank.dtb
 dtb-$(CONFIG_ARCH_INTEGRATOR) += integratorap.dtb \
 	integratorcp.dtb

arch/arm/boot/dts/cros5250-common.dtsi

+/*
+ * Common device tree include for all Exynos 5250 boards based off of Daisy.
+ *
+ * Copyright (c) 2012 Google, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+/ {
+	aliases {
+	};
+
+	memory {
+		reg = <0x40000000 0x80000000>;
+	};
+
+	chosen {
+	};
+
+	i2c@12C60000 {
+		samsung,i2c-sda-delay = <100>;
+		samsung,i2c-max-bus-freq = <378000>;
+		gpios = <&gpb3 0 2 3 0>,
+			<&gpb3 1 2 3 0>;
+	};
+
+	i2c@12C70000 {
+		samsung,i2c-sda-delay = <100>;
+		samsung,i2c-max-bus-freq = <378000>;
+		gpios = <&gpb3 2 2 3 0>,
+			<&gpb3 3 2 3 0>;
+	};
+
+	i2c@12C80000 {
+		samsung,i2c-sda-delay = <100>;
+		samsung,i2c-max-bus-freq = <66000>;
+
+		/*
+		 * Disabled pullups since external part has its own pullups and
+		 * double-pulling gets us out of spec in some cases.
+		 */
+		gpios = <&gpa0 6 3 0 0>,
+			<&gpa0 7 3 0 0>;
+
+		hdmiddc@50 {
+			compatible = "samsung,exynos5-hdmiddc";
+			reg = <0x50>;
+		};
+	};
+
+	i2c@12C90000 {
+		samsung,i2c-sda-delay = <100>;
+		samsung,i2c-max-bus-freq = <66000>;
+		gpios = <&gpa1 2 3 3 0>,
+			<&gpa1 3 3 3 0>;
+	};
+
+	i2c@12CA0000 {
+		status = "disabled";
+	};
+
+	i2c@12CB0000 {
+		samsung,i2c-sda-delay = <100>;
+		samsung,i2c-max-bus-freq = <66000>;
+		gpios = <&gpa2 2 3 3 0>,
+			<&gpa2 3 3 3 0>;
+	};
+
+	i2c@12CC0000 {
+		status = "disabled";
+	};
+
+	i2c@12CD0000 {
+		samsung,i2c-sda-delay = <100>;
+		samsung,i2c-max-bus-freq = <66000>;
+		gpios = <&gpb2 2 3 3 0>,
+			<&gpb2 3 3 3 0>;
+	};
+
+	i2c@12CE0000 {
+		samsung,i2c-sda-delay = <100>;
+		samsung,i2c-max-bus-freq = <378000>;
+
+		hdmiphy@38 {
+			compatible = "samsung,exynos5-hdmiphy";
+			reg = <0x38>;
+		};
+	};
+
+	dwmmc0@12200000 {
+		num-slots = <1>;
+		supports-highspeed;
+		broken-cd;
+		fifo-depth = <0x80>;
+		card-detect-delay = <200>;
+		samsung,dw-mshc-ciu-div = <3>;
+		samsung,dw-mshc-sdr-timing = <2 3 3>;
+		samsung,dw-mshc-ddr-timing = <1 2 3>;
+
+		slot@0 {
+			reg = <0>;
+			bus-width = <8>;
+			gpios = <&gpc0 0 2 0 3>, <&gpc0 1 2 0 3>,
+				<&gpc1 0 2 3 3>, <&gpc1 1 2 3 3>,
+				<&gpc1 2 2 3 3>, <&gpc1 3 2 3 3>,
+				<&gpc0 3 2 3 3>, <&gpc0 4 2 3 3>,
+				<&gpc0 5 2 3 3>, <&gpc0 6 2 3 3>;
+		};
+	};
+
+	dwmmc1@12210000 {
+		status = "disabled";
+	};
+
+	dwmmc2@12220000 {
+		num-slots = <1>;
+		supports-highspeed;
+		fifo-depth = <0x80>;
+		card-detect-delay = <200>;
+		samsung,dw-mshc-ciu-div = <3>;
+		samsung,dw-mshc-sdr-timing = <2 3 3>;
+		samsung,dw-mshc-ddr-timing = <1 2 3>;
+
+		slot@0 {
+			reg = <0>;
+			bus-width = <4>;
+			samsung,cd-pinmux-gpio = <&gpc3 2 2 3 3>;
+			wp-gpios = <&gpc2 1 0 0 3>;
+			gpios = <&gpc3 0 2 0 3>, <&gpc3 1 2 0 3>,
+				<&gpc3 3 2 3 3>, <&gpc3 4 2 3 3>,
+				<&gpc3 5 2 3 3>, <&gpc3 6 2 3 3>;
+		};
+	};
+
+	dwmmc3@12230000 {
+		num-slots = <1>;
+		supports-highspeed;
+		broken-cd;
+		fifo-depth = <0x80>;
+		card-detect-delay = <200>;
+		samsung,dw-mshc-ciu-div = <3>;
+		samsung,dw-mshc-sdr-timing = <2 3 3>;
+		samsung,dw-mshc-ddr-timing = <1 2 3>;
+
+		slot@0 {
+			reg = <0>;
+			bus-width = <4>;
+			/* See board-specific dts files for GPIOs */
+		};
+	};
+
+	spi_0: spi@12d20000 {
+		status = "disabled";
+	};
+
+	spi_1: spi@12d30000 {
+		gpios = <&gpa2 4 2 3 0>,
+			<&gpa2 6 2 3 0>,
+			<&gpa2 7 2 3 0>;
+		samsung,spi-src-clk = <0>;
+		num-cs = <1>;
+	};
+
+	spi_2: spi@12d40000 {
+		status = "disabled";
+	};
+
+	hdmi {
+		hpd-gpio = <&gpx3 7 0xf 1 3>;
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		power {
+			label = "Power";
+			gpios = <&gpx1 3 0 0x10000 0>;
+			linux,code = <116>; /* KEY_POWER */
+			gpio-key,wakeup;
+		};
+	};
+};

arch/arm/boot/dts/exynos5250-snow.dts

+/*
+ * Google Snow board device tree source
+ *
+ * Copyright (c) 2012 Google, Inc
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+/dts-v1/;
+/include/ "exynos5250.dtsi"
+/include/ "cros5250-common.dtsi"
+
+/ {
+	model = "Google Snow";
+	compatible = "google,snow", "samsung,exynos5250";
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		lid-switch {
+			label = "Lid";
+			gpios = <&gpx3 5 0 0x10000 0>;
+			linux,input-type = <5>; /* EV_SW */
+			linux,code = <0>; /* SW_LID */
+			debounce-interval = <1>;
+			gpio-key,wakeup;
+		};
+	};
+
+	/*
+	 * On Snow we've got SIP WiFi and so can keep drive strengths low to
+	 * reduce EMI.
+	 */
+	dwmmc3@12230000 {
+		slot@0 {
+			gpios = <&gpc4 0 2 0 0>, <&gpc4 1 2 3 0>,
+				<&gpc4 3 2 3 0>, <&gpc4 4 2 3 0>,
+				<&gpc4 5 2 3 0>, <&gpc4 6 2 3 0>;
+		};
+	};
+};