ASoC: Add DT bindings documentation for max9759 amplifier

This patch adds DT bindings documentation for Maxim MAX9759
speaker amplifier.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/Documentation/devicetree/bindings/sound/maxim,max9759.txt b/Documentation/devicetree/bindings/sound/maxim,max9759.txt
new file mode 100644 (file)
index 0000000..737a996
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/maxim,max9759.txt
@@ -0,0 +1,18 @@
+Maxim MAX9759 Speaker Amplifier
+===============================
+
+Required properties:
+- compatible : "maxim,max9759"
+- shutdown-gpios : the gpio connected to the shutdown pin
+- mute-gpios : the gpio connected to the mute pin
+- gain-gpios : the 2 gpios connected to the g1 and g2 pins
+
+Example:
+
+max9759: analog-amplifier {
+       compatible = "maxim,max9759";
+       shutdown-gpios = <&gpio3 20 GPIO_ACTIVE_LOW>;
+       mute-gpios = <&gpio3 19 GPIO_ACTIVE_LOW>;
+       gain-gpios = <&gpio3 23 GPIO_ACTIVE_LOW>,
+                    <&gpio3 25 GPIO_ACTIVE_LOW>;
+};