dt/bindings: Add bindings for PIC32/MZDA platforms

This adds support for the Microchip PIC32 platform along with the
specific variant PIC32MZDA on a PIC32MZDA Starter Kit.

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: [email protected]
Cc: [email protected]
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/12096/
Signed-off-by: Ralf Baechle <[email protected]>

diff --git a/Documentation/devicetree/bindings/mips/pic32/microchip,pic32mzda.txt b/Documentation/devicetree/bindings/mips/pic32/microchip,pic32mzda.txt
new file mode 100644 (file)
index 0000000..1c8dbc4
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/pic32/microchip,pic32mzda.txt
@@ -0,0 +1,31 @@
+* Microchip PIC32MZDA Platforms
+
+PIC32MZDA Starter Kit
+Required root node properties:
+    - compatible = "microchip,pic32mzda-sk", "microchip,pic32mzda"
+
+CPU nodes:
+----------
+A "cpus" node is required.  Required properties:
+ - #address-cells: Must be 1.
+ - #size-cells: Must be 0.
+A CPU sub-node is also required.  Required properties:
+ - device_type: Must be "cpu".
+ - compatible: Must be "mti,mips14KEc".
+Example:
+       cpus {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               cpu0: cpu@0 {
+                       device_type = "cpu";
+                       compatible = "mti,mips14KEc";
+               };
+       };
+
+Boot protocol
+--------------
+In accordance with Unified Hosting Interface Reference Manual (MD01069), the
+bootloader must pass the following arguments to the kernel:
+ - $a0: -2.
+ - $a1: KSEG0 address of the flattened device-tree blob.