[PATCH RFC 2/2] Input: raspberrypi-ts - add devicetree binding documentation

[Nicolas Saenz Julienne]

Adds device tree documentation for Raspberry Pi's official 7"
touchscreen. The firmware mailbox interface allows the ARM core to
control the device.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
---
 .../touchscreen/raspberrypi,firmware-ts.txt   | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/raspberrypi,firmware-ts.txt

diff --git a/Documentation/devicetree/bindings/input/touchscreen/raspberrypi,firmware-ts.txt b/Documentation/devicetree/bindings/input/touchscreen/raspberrypi,firmware-ts.txt
new file mode 100644
index 000000000000..d28189476279
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/raspberrypi,firmware-ts.txt
@@ -0,0 +1,25 @@
+Raspberry Pi 3 firmware based 7" touchscreen
+=====================================
+
+Required properties:
+ - compatible: "raspberrypi,firmware-ts"
+
+Optional properties:
+ - touchscreen-size-x: See touchscreen.txt
+ - touchscreen-size-y: See touchscreen.txt
+ - touchscreen-inverted-x: See touchscreen.txt
+ - touchscreen-inverted-y: See touchscreen.txt
+ - touchscreen-swapped-x-y: See touchscreen.txt
+
+Example:
+
+firmware: firmware-rpi {
+	compatible = "raspberrypi,bcm2835-firmware", "simple-bus";
+	mboxes = <&mailbox>;
+
+	ts: touchscreen {
+		compatible = "raspberrypi,firmware-ts";
+		touchscreen-size-x = <800>;
+		touchscreen-size-y = <480>;
+	};
+};
-- 
2.19.2