Input: spear-keyboard - document DT bindings

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

diff --git a/Documentation/devicetree/bindings/input/spear-keyboard.txt b/Documentation/devicetree/bindings/input/spear-keyboard.txt
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+* SPEAr keyboard controller
+
+Required properties:
+- compatible: "st,spear300-kbd"
+
+Optional properties, in addition to those specified by the shared
+matrix-keyboard bindings:
+- autorepeat: bool: enables key autorepeat
+- st,mode: keyboard mode: 0 - 9x9, 1 - 6x6, 2 - 2x2
+
+Example:
+
+kbd@fc400000 {
+       compatible = "st,spear300-kbd";
+       reg = <0xfc400000 0x100>;
+       linux,keymap = < 0x00030012
+                        0x0102003a >;
+       autorepeat;
+       st,mode = <0>;
+};