Add the initial device tree for the R8A7794 SoC based SILK low cost board.
SCIF2 serial port support is included, so that the serial console can work.

Signed-off-by: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>

---
This patch is against the 'renesas-devel-20150129-v3.19-rc6' tag of Simon
Horman's 'renesas.git' repo.

 arch/arm/boot/dts/Makefile         |    1 
 arch/arm/boot/dts/r8a7794-silk.dts |   41 +++++++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+)

Index: renesas/arch/arm/boot/dts/Makefile
===================================================================
--- renesas.orig/arch/arm/boot/dts/Makefile
+++ renesas/arch/arm/boot/dts/Makefile
@@ -421,6 +421,7 @@ dtb-$(CONFIG_ARCH_SHMOBILE_MULTI) += eme
        r8a7791-koelsch.dtb \
        r8a7791-porter.dtb \
        r8a7794-alt.dtb \
+       r8a7794-silk.dtb \
        sh73a0-kzm9g.dtb
 dtb-$(CONFIG_ARCH_SOCFPGA) += socfpga_arria5_socdk.dtb \
        socfpga_arria10_socdk.dtb \
Index: renesas/arch/arm/boot/dts/r8a7794-silk.dts
===================================================================
--- /dev/null
+++ renesas/arch/arm/boot/dts/r8a7794-silk.dts
@@ -0,0 +1,41 @@
+/*
+ * Device Tree Source for the SILK board
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ * Copyright (C) 2014-2015 Renesas Solutions Corp.
+ * Copyright (C) 2014-2015 Cogent Embedded, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+/dts-v1/;
+#include "r8a7794.dtsi"
+
+/ {
+       model = "SILK";
+       compatible = "renesas,silk", "renesas,r8a7794";
+
+       aliases {
+               serial0 = &scif2;
+       };
+
+       chosen {
+               bootargs = "console=ttySC0,38400 ignore_loglevel";
+               stdout-path = &scif2;
+       };
+
+       memory@40000000 {
+               device_type = "memory";
+               reg = <0 0x40000000 0 0x40000000>;
+       };
+};
+
+&extal_clk {
+       clock-frequency = <20000000>;
+};
+
+&scif2 {
+       status = "okay";
+};

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