Some versions of u-boot for this Chromebook check for tpm node
in the device tree and fail badly (reboot) if it is not found.

While not exactly correct, it is much easier to patch the mainline
device tree to match u-boot expectations than to fix u-boot on
this device.

See https://code.google.com/p/chromium/issues/detail?id=220169
and https://lkml.org/lkml/2013/3/4/242

Signed-off-by: Alex Suykov <alex.suykov@gmail.com>

--- a/arch/arm/boot/dts/exynos5250-snow-common.dtsi
+++ b/arch/arm/boot/dts/exynos5250-snow-common.dtsi
@@ -466,6 +466,11 @@
 	status = "okay";
 	samsung,i2c-sda-delay = <100>;
 	samsung,i2c-max-bus-freq = <66000>;
+
+	tpm {
+		compatible = "infineon,slb9635tt";
+		reg = <0x20>;
+	};
 };
 
 &i2c_5 {