dt-bindings: timer: gx6605s SOC timer

Dt-bindings doc for gx6605s SOC's system timer.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt b/Documentation/devicetree/bindings/timer/csky,gx6605s-timer.txt
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+=================
+gx6605s SOC Timer
+=================
+
+The timer is used in gx6605s soc as system timer and the driver
+contain clk event and clk source.
+
+==============================
+timer node bindings definition
+==============================
+
+       Description: Describes gx6605s SOC timer
+
+       PROPERTIES
+
+       - compatible
+               Usage: required
+               Value type: <string>
+               Definition: must be "csky,gx6605s-timer"
+       - reg
+               Usage: required
+               Value type: <u32 u32>
+               Definition: <phyaddr size> in soc from cpu view
+       - clocks
+               Usage: required
+               Value type: phandle + clock specifier cells
+               Definition: must be input clk node
+       - interrupt
+               Usage: required
+               Value type: <u32>
+               Definition: must be timer irq num defined by soc
+
+Examples:
+---------
+
+       timer0: timer@20a000 {
+               compatible = "csky,gx6605s-timer";
+               reg = <0x0020a000 0x400>;
+               clocks = <&dummy_apb_clk>;
+               interrupts = <10>;
+               interrupt-parent = <&intc>;
+       };