dt-bindings: Add Pervasive Displays RePaper bindings

Add device-tree binding documentation for the 1.44", 1.9", 2.0" and 2.7"
display panels.

Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1496934875-51984-3-git-send-email-noralf@tronnes.org

diff --git a/Documentation/devicetree/bindings/display/repaper.txt b/Documentation/devicetree/bindings/display/repaper.txt
new file mode 100644 (file)
index 0000000..f5f9f9c
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/repaper.txt
@@ -0,0 +1,52 @@
+Pervasive Displays RePaper branded e-ink displays
+
+Required properties:
+- compatible:          "pervasive,e1144cs021" for 1.44" display
+                       "pervasive,e1190cs021" for 1.9" display
+                       "pervasive,e2200cs021" for 2.0" display
+                       "pervasive,e2271cs021" for 2.7" display
+
+- panel-on-gpios:      Timing controller power control
+- discharge-gpios:     Discharge control
+- reset-gpios:         RESET pin
+- busy-gpios:          BUSY pin
+
+Required property for e2271cs021:
+- border-gpios:                Border control
+
+The node for this driver must be a child node of a SPI controller, hence
+all mandatory properties described in ../spi/spi-bus.txt must be specified.
+
+Optional property:
+- pervasive,thermal-zone:      name of thermometer's thermal zone
+
+Example:
+
+       display_temp: lm75@48 {
+               compatible = "lm75b";
+               reg = <0x48>;
+               #thermal-sensor-cells = <0>;
+       };
+
+       thermal-zones {
+               display {
+                       polling-delay-passive = <0>;
+                       polling-delay = <0>;
+                       thermal-sensors = <&display_temp>;
+               };
+       };
+
+       papirus27@0{
+               compatible = "pervasive,e2271cs021";
+               reg = <0>;
+
+               spi-max-frequency = <8000000>;
+
+               panel-on-gpios = <&gpio 23 0>;
+               border-gpios = <&gpio 14 0>;
+               discharge-gpios = <&gpio 15 0>;
+               reset-gpios = <&gpio 24 0>;
+               busy-gpios = <&gpio 25 0>;
+
+               pervasive,thermal-zone = "display";
+       };