[alsa-devel] [PATCH 1/2] devicetree: Add devicetree bindings documentation for the ADAU1977

[Lars-Peter Clausen]

On 02/03/2014 04:15 PM, Geert Uytterhoeven wrote:
> On Mon, Feb 3, 2014 at 3:57 PM, Lars-Peter Clausen <lars at metafoo.de> wrote:
>> + - adi,micbias: Configures the voltage setting for the MICBIAS pin. If not
>> +   specified the default value will be 8.5 Volts. This property is only valid
>> +   for the ADAU1977.
>> +   Valid values for this property are:
>> +       0: 5.0V
>> +       1: 5.5V
>> +       2: 6.0V
>> +       3: 6.5V
>> +       4: 7.0V
>> +       5: 7.5V
>> +       6: 8.0V
>> +       7: 8.5V
>> +       8: 9.0V
>
> This means the casual DTS reader need to know about the meaning of
> the values. You can avoid that by:
>    1. Using preprocessor defines. Drawback is that you have to add an
>       include file.
>    2. Using mV, and specify minimum, maximum, and incrementals in the
>       bindings, cfr.
> Documentation/devicetree/bindings/power_supply/ti,bq24735.txt
>       Drawback is that the user can easily specify invalid values.


Is there a preference for either of them?

Thanks,
- Lars