Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / sound / cs42l52.txt

diff --git a/kernel/Documentation/devicetree/bindings/sound/cs42l52.txt b/kernel/Documentation/devicetree/bindings/sound/cs42l52.txt
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+CS42L52 audio CODEC
+
+Required properties:
+
+  - compatible : "cirrus,cs42l52"
+
+  - reg : the I2C address of the device for I2C
+
+Optional properties:
+
+  - cirrus,reset-gpio : GPIO controller's phandle and the number
+  of the GPIO used to reset the codec.
+
+  - cirrus,chgfreq-divisor : Values used to set the Charge Pump Frequency.
+  Allowable values of 0x00 through 0x0F. These are raw values written to the
+  register, not the actual frequency. The frequency is determined by the following.
+  Frequency = (64xFs)/(N+2)
+  N = chgfreq_val
+  Fs = Sample Rate (variable)
+
+  - cirrus,mica-differential-cfg : boolean, If present, then the MICA input is configured
+  as a differential input. If not present then the MICA input is configured as
+  Single-ended input. Single-ended mode allows for MIC1 or MIC2 muxing for input.
+
+  - cirrus,micb-differential-cfg : boolean, If present, then the MICB input is configured
+  as a differential input. If not present then the MICB input is configured as
+  Single-ended input. Single-ended mode allows for MIC1 or MIC2 muxing for input.
+
+  - cirrus,micbias-lvl: Set the output voltage level on the MICBIAS Pin
+  0 = 0.5 x VA
+  1 = 0.6 x VA
+  2 = 0.7 x VA
+  3 = 0.8 x VA
+  4 = 0.83 x VA
+  5 = 0.91 x VA
+
+Example:
+
+codec: codec@4a {
+       compatible = "cirrus,cs42l52";
+       reg = <0x4a>;
+       reset-gpio = <&gpio 10 0>;
+       cirrus,chgfreq-divisor = <0x05>;
+       cirrus.mica-differential-cfg;
+       cirrus,micbias-lvl = <5>;
+};