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

[Austin, Brian]

On May 5, 2014, at 4:18 PM, Kumar Gala <galak at codeaurora.org> wrote:

> 
> 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?
That would not cause any issues, but you can only tie the ref to one of the inputs

> 
>> +
>> +  - 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
Could you explain more please?

Thanks
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