Enable SLINK4 and connected device in Tegra30 based
platform Cardhu.
Setting maximum spi frequency to 25MHz.

Spi serial flash is connected on CS1 of SLINK4 on
cardhu platform.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
---
Changes from V1:
- rename the max freq prop to spi-max-frequency

Changes from V2:
- make node name to spi@

Changes from V3:
- Add winbond spi flash as cs1 for slink4.
- Add winbond company name in vendor list.

 .../devicetree/bindings/vendor-prefixes.txt        |    1 +
 arch/arm/boot/dts/tegra30-cardhu.dtsi              |   10 ++++++++++
 2 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.txt b/Documentation/devicetree/bindings/vendor-prefixes.txt
index 9de2b9f..ac2c2c4 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.txt
+++ b/Documentation/devicetree/bindings/vendor-prefixes.txt

@@ -51,4 +51,5 @@ ti	Texas Instruments
 via	VIA Technologies, Inc.
 wlf	Wolfson Microelectronics
 wm	Wondermedia Technologies, Inc.
+winbond Winbond Electronics corp.
 xlnx	Xilinx

diff --git a/arch/arm/boot/dts/tegra30-cardhu.dtsi b/arch/arm/boot/dts/tegra30-cardhu.dtsi
index b245e6c..b4e0eda 100644
--- a/arch/arm/boot/dts/tegra30-cardhu.dtsi
+++ b/arch/arm/boot/dts/tegra30-cardhu.dtsi

@@ -275,6 +275,16 @@
 		};
 	};
 
+	spi at 7000da00 {
+		status = "okay";
+		spi-max-frequency = <25000000>;
+		spi-flash at 1 {
+			compatible = "winbond,w25q32";
+			spi-max-frequency = <20000000>;
+			reg = <1>;
+		};
+	};
+
 	ahub {
 		i2s at 70080400 {
 			status = "okay";

-- 
1.7.1.1