[alsa-devel] [PATCH 2/2] Documentation: dt: bindings: sound: Add bindings for CS42L56 CODEC

[Kumar Gala]

On May 5, 2014, at 3:09 PM, Brian Austin <brian.austin at cirrus.com> wrote:

> This patch adds binding documentation for the Cirrus Logic CS42L56 Low Power Stereo I2C CODEC
> 
> Signed-off-by: Brian Austin <brian.austin at cirrus.com>
> ---
> .../devicetree/bindings/sound/cs42l56.txt          |   63 ++++++++++++++++++++
> 1 file changed, 63 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/sound/cs42l56.txt
> 
> diff --git a/Documentation/devicetree/bindings/sound/cs42l56.txt b/Documentation/devicetree/bindings/sound/cs42l56.txt
> new file mode 100644
> index 0000000..9ae074f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/cs42l56.txt
> @@ -0,0 +1,63 @@
> +CS42L52 audio CODEC
> +
> +Required properties:
> +
> +  - compatible : "cirrus,cs42l56"
> +
> +  - reg : the I2C address of the device for I2C
> +
> +  - VA-supply, VCP-supply, VLDO-supply : power supplies for the device,
> +  as covered in Documentation/devicetree/bindings/regulator/regulator.txt.
> +
> +Optional properties:
> +
> +  - cirrus,gpio-nreset : 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 = MCLK / 4 * (N+2)
> +  N = chgfreq_val
> +  MCLK = Where MCLK is the frequency of the mclk signal after the MCLKDIV2 circuit.
> +
> +  - cirrus,ain1a-ref-cfg, ain1b-ref-cfg : boolean, If present, AIN1A or AIN1B are configured
> +  as a pseudo-differential input referenced to AIN1REF/AIN3A.

What happens if a DT had both bools?

> +
> +  - cirrus,ain2a-ref-cfg, ain2b-ref-cfg : boolean, If present, AIN2A or AIN2B are configured
> +  as a pseudo-differential input referenced to AIN2REF/AIN3B.
> +
> +  - 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
> +
> +  - cirrus,adaptive-pwr-cfg : Configures how the power to the Headphone and Lineout
> +  Amplifiers adapt to the output signal levels.
> +  0 = Adapt to Volume Mode. Voltage level determined by the sum of the relevant volume settings.
> +  1 = Fixed - Headphone and Line Amp supply = + or - VCP/2.
> +  2 = Fixed - Headphone and Line Amp supply = + or - VCP.
> +  3 = Adapted to Signal; Voltage level is dynamically determined by the output signal.
> +
> +  - cirrus,hpf-left-freq, hpf-right-freq : Sets the corner frequency (-3dB point) for the internal High-Pass
> +  Filter.
> +  0 = 1.8Hz
> +  1 = 119Hz
> +  2 = 236Hz
> +  3 = 464Hz
> +

Add a include/dt-bindings for all the various enums

> +
> +Example:
> +
> +codec: codec at 4b {
> +	compatible = "cirrus,cs42l56";
> +	reg = <0x4b>;
> +	gpio-reset = <&gpio 10 0>;
> +	cirrus,chgfreq-divisor = <0x05>;
> +	cirrus.ain1_ref_cfg;
> +	cirrus,micbias-lvl = <5>;
> +	VA-supply = <&reg_audio>;
> +};
> -- 
> 1.7.9.5
> 

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