Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / sound / ak4104.txt

diff --git a/kernel/Documentation/devicetree/bindings/sound/ak4104.txt b/kernel/Documentation/devicetree/bindings/sound/ak4104.txt
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+++ b/kernel/Documentation/devicetree/bindings/sound/ak4104.txt
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+AK4104 S/PDIF transmitter
+
+This device supports SPI mode only.
+
+Required properties:
+
+  - compatible : "asahi-kasei,ak4104"
+
+  - reg : The chip select number on the SPI bus
+
+  - vdd-supply : A regulator node, providing 2.7V - 3.6V
+
+Optional properties:
+
+  - reset-gpio : a GPIO spec for the reset pin. If specified, it will be
+                deasserted before communication to the device starts.
+
+Example:
+
+spdif: ak4104@0 {
+       compatible = "asahi-kasei,ak4104";
+       reg = <0>;
+       spi-max-frequency = <5000000>;
+       vdd-supply = <&vdd_3v3_reg>;
+};