ARM: dts: STiH407: Add B2120 board support

B2120 HDK is the reference board for STiH407 SoC.
It has the following characteristics:
- 1GB DDR3
- 8GB eMMC / SD-Card slot
- 32MB NOR Flash
- 1 x Gbit Ethernet
- 1 x USB 3.0 port
- 1 x Mini-PCIe
- 1 x SATA
- 1 x HDMI output
- 1 x HDMI input
- 1 x SPDIF

This patch only introduces basic functionnalities, such as I2C and UART.

Acked-by: Giuseppe Cavallaro <[e-mail]>
Acked-by: Lee Jones <[e-mail]>
Acked-by: Patrice Chotard <[e-mail]>
Signed-off-by: Giuseppe Cavallaro <[e-mail]>
Signed-off-by: Maxime Coquelin <[e-mail]>

arch/arm/boot/dts/Makefile

···
 	spear320-evb.dtb \
 	spear320-hmi.dtb
 dtb-$(CONFIG_ARCH_SPEAR6XX)+= spear600-evb.dtb
-dtb-$(CONFIG_ARCH_STI)+= stih415-b2000.dtb \
+dtb-$(CONFIG_ARCH_STI)+= stih407-b2120.dtb \
+	stih415-b2000.dtb \
 	stih415-b2020.dtb \
 	stih416-b2000.dtb \
 	stih416-b2020.dtb

arch/arm/boot/dts/stih407-b2120.dts

···
+/*
+ * Copyright (C) 2014 STMicroelectronics (R&D) Limited.
+ * Author: Giuseppe Cavallaro <[e-mail]>
+ *
+ * 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 "stih407.dtsi"
+/ {
+	model = "STiH407 B2120";
+	compatible = "st,stih407-b2120", "st,stih407";
+
+	chosen {
+		bootargs = "console=ttyAS0,115200";
+		linux,stdout-path = &sbc_serial0;
+	};
+
+	memory {
+		device_type = "memory";
+		reg = <0x40000000 0x80000000>;
+	};
+
+	aliases {
+		ttyAS0 = &sbc_serial0;
+	};
+
+	soc {
+		sbc_serial0: serial@9530000 {
+			status = "okay";
+		};
+
+		leds {
+			compatible = "gpio-leds";
+			red {
+				#gpio-cells = <2>;
+				label = "Front Panel LED";
+				gpios = <&pio4 1 0>;
+				linux,default-trigger = "heartbeat";
+			};
+			green {
+				#gpio-cells = <2>;
+				gpios = <&pio1 3 0>;
+				default-state = "off";
+			};
+		};
+
+		i2c@9842000 {
+			status = "okay";
+		};
+
+		i2c@9843000 {
+			status = "okay";
+		};
+
+		i2c@9844000 {
+			status = "okay";
+		};
+
+		i2c@9845000 {
+			status = "okay";
+		};
+
+		i2c@9540000 {
+			status = "okay";
+		};
+
+		/* SSC11 to HDMI */
+		i2c@9541000 {
+			status = "okay";
+			/* HDMI V1.3a supports Standard mode only */
+			clock-frequency = <100000>;
+			st,i2c-min-scl-pulse-width-us = <0>;
+			st,i2c-min-sda-pulse-width-us = <5>;
+		};
+	};
+};