drm/i2c: tda998x: add DT documentation

Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/Documentation/devicetree/bindings/drm/i2c/tda998x.txt b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
new file mode 100644 (file)
index 0000000..d7df01c
--- /dev/null
+++ b/Documentation/devicetree/bindings/drm/i2c/tda998x.txt
@@ -0,0 +1,27 @@
+Device-Tree bindings for the NXP TDA998x HDMI transmitter
+
+Required properties;
+  - compatible: must be "nxp,tda998x"
+
+Optional properties:
+  - interrupts: interrupt number and trigger type
+       default: polling
+
+  - pinctrl-0: pin control group to be used for
+       screen plug/unplug interrupt.
+
+  - pinctrl-names: must contain a "default" entry.
+
+  - video-ports: 24 bits value which defines how the video controller
+       output is wired to the TDA998x input - default: <0x230145>
+
+Example:
+
+       tda998x: hdmi-encoder {
+               compatible = "nxp,tda998x";
+               reg = <0x70>;
+               interrupt-parent = <&gpio0>;
+               interrupts = <27 2>;            /* falling edge */
+               pinctrl-0 = <&pmx_camera>;
+               pinctrl-names = "default";
+       };