dt-bindings: document the MPS2 timer bindings

This adds documentation of device tree bindings for the
timers found on ARM MPS2 platform.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/Documentation/devicetree/bindings/timer/arm,mps2-timer.txt b/Documentation/devicetree/bindings/timer/arm,mps2-timer.txt
new file mode 100644 (file)
index 0000000..48f84d7
--- /dev/null
+++ b/Documentation/devicetree/bindings/timer/arm,mps2-timer.txt
@@ -0,0 +1,28 @@
+ARM MPS2 timer
+
+The MPS2 platform has simple general-purpose 32 bits timers.
+
+Required properties:
+- compatible   : Should be "arm,mps2-timer"
+- reg          : Address and length of the register set
+- interrupts   : Reference to the timer interrupt
+
+Required clocking property, have to be one of:
+- clocks         : The input clock of the timer
+- clock-frequency : The rate in HZ in input of the ARM MPS2 timer
+
+Examples:
+
+timer1: mps2-timer@40000000 {
+       compatible = "arm,mps2-timer";
+       reg = <0x40000000 0x1000>;
+       interrupts = <8>;
+       clocks = <&sysclk>;
+};
+
+timer2: mps2-timer@40001000 {
+       compatible = "arm,mps2-timer";
+       reg = <0x40001000 0x1000>;
+       interrupts = <9>;
+       clock-frequency = <25000000>;
+};