devicetree: cadence_ttc: Document binding for timer width

Modern TTC implementations can extend the timer width to 32 bit. This
feature is not self identifying so the driver needs to be made aware
via device tree.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --git a/Documentation/devicetree/bindings/timer/cadence,ttc-timer.txt b/Documentation/devicetree/bindings/timer/cadence,ttc-timer.txt
index 993695c659e18ae1b5ca165b46e032e246be1cb7..eeee6cd51e5ce94985653015c08691cc24e5ed07 100644 (file)
--- a/Documentation/devicetree/bindings/timer/cadence,ttc-timer.txt
+++ b/Documentation/devicetree/bindings/timer/cadence,ttc-timer.txt
@@ -6,6 +6,9 @@ Required properties:
 - interrupts : A list of 3 interrupts; one per timer channel.
 - clocks: phandle to the source clock
 
+Optional properties:
+- timer-width: Bit width of the timer, necessary if not 16.
+
 Example:
 
 ttc0: ttc0@f8001000 {
@@ -14,4 +17,5 @@ ttc0: ttc0@f8001000 {
        compatible = "cdns,ttc";
        reg = <0xF8001000 0x1000>;
        clocks = <&cpu_clk 3>;
+       timer-width = <32>;
 };