dt/bindings: Add bindings for the PIC32 real time clock

Document the devicetree bindings for the real time clock found
on Microchip PIC32 class devices.

Signed-off-by: Joshua Henderson <joshua.henderson@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/Documentation/devicetree/bindings/rtc/microchip,pic32-rtc.txt b/Documentation/devicetree/bindings/rtc/microchip,pic32-rtc.txt
new file mode 100644 (file)
index 0000000..180b714
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/microchip,pic32-rtc.txt
@@ -0,0 +1,21 @@
+* Microchip PIC32 Real Time Clock and Calendar
+
+The RTCC keeps time in hours, minutes, and seconds, and one half second. It
+provides a calendar in weekday, date, month, and year. It also provides a
+configurable alarm.
+
+Required properties:
+- compatible: should be: "microchip,pic32mzda-rtc"
+- reg: physical base address of the controller and length of memory mapped
+    region.
+- interrupts: RTC alarm/event interrupt
+- clocks: clock phandle
+
+Example:
+
+       rtc: rtc@1f8c0000 {
+               compatible = "microchip,pic32mzda-rtc";
+               reg = <0x1f8c0000 0x60>;
+               interrupts = <166 IRQ_TYPE_EDGE_RISING>;
+               clocks = <&PBCLK6>;
+       };