dt/bindings: Add bindings for PIC32 deadman timer peripheral

Document the devicetree bindings for the deadman timer peripheral found on
Microchip PIC32 SoC class devices.

Signed-off-by: Purna Chandra Mandal <[email protected]>
Signed-off-by: Joshua Henderson <[email protected]>
Acked-by: Rob Herring <[email protected]>
Cc: Pawel Moll <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Ian Campbell <[email protected]>
Cc: Kumar Gala <[email protected]>
Cc: Wim Van Sebroeck <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/12702/
Signed-off-by: Ralf Baechle <[email protected]>

diff --git a/Documentation/devicetree/bindings/watchdog/microchip,pic32-dmt.txt b/Documentation/devicetree/bindings/watchdog/microchip,pic32-dmt.txt
new file mode 100644 (file)
index 0000000..852f694
--- /dev/null
+++ b/Documentation/devicetree/bindings/watchdog/microchip,pic32-dmt.txt
@@ -0,0 +1,19 @@
+* Microchip PIC32 Deadman Timer
+
+The deadman timer is used to reset the processor in the event of a software
+malfunction. It is a free-running instruction fetch timer, which is clocked
+whenever an instruction fetch occurs until a count match occurs.
+
+Required properties:
+- compatible: must be "microchip,pic32mzda-dmt".
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- clocks: phandle of parent clock (should be &PBCLK7).
+
+Example:
+
+       watchdog@1f800a00 {
+               compatible = "microchip,pic32mzda-dmt";
+               reg = <0x1f800a00 0x80>;
+               clocks = <&PBCLK7>;
+       };