[media] Documentation: bindings: add documentation for ir-spi device driver

Document the ir-spi driver's binding which is a IR led driven
through the SPI line.

Signed-off-by: Andi Shyti <andi.shyti@samsung.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/Documentation/devicetree/bindings/leds/irled/spi-ir-led.txt b/Documentation/devicetree/bindings/leds/irled/spi-ir-led.txt
new file mode 100644 (file)
index 0000000..896b699
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/irled/spi-ir-led.txt
@@ -0,0 +1,29 @@
+Device tree bindings for IR LED connected through SPI bus which is used as
+remote controller.
+
+The IR LED switch is connected to the MOSI line of the SPI device and the data
+are delivered thourgh that.
+
+Required properties:
+       - compatible: should be "ir-spi-led".
+
+Optional properties:
+       - duty-cycle: 8 bit balue that represents the percentage of one period
+         in which the signal is active.  It can be 50, 60, 70, 75, 80 or 90.
+       - led-active-low: boolean value that specifies whether the output is
+         negated with a NOT gate.
+       - power-supply: specifies the power source. It can either be a regulator
+         or a gpio which enables a regulator, i.e. a regulator-fixed as
+         described in
+         Documentation/devicetree/bindings/regulator/fixed-regulator.txt
+
+Example:
+
+       irled@0 {
+               compatible = "ir-spi-led";
+               reg = <0x0>;
+               spi-max-frequency = <5000000>;
+               power-supply = <&vdd_led>;
+               led-active-low;
+               duty-cycle = /bits/ 8 <60>;
+       };