Re: [PATCH 2/2] Documentation: cs35l41: Shared boost properties

[Lucas Tanure <lucas.tanure@collabora.com>]

On 07-02-2023 10:42, Krzysztof Kozlowski wrote:
> On 07/02/2023 11:40, Lucas Tanure wrote:
>> Describe the properties used for shared boost
>> configuration.
> 
> Use subject prefixes matching the subsystem (which you can get for
> example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
> your patch is touching).
ack
> 
>>
>> Signed-off-by: Lucas Tanure <lucas.tanure@collabora.com>
>> ---
>>   .../devicetree/bindings/sound/cirrus,cs35l41.yaml     | 11 ++++++++++-
>>   1 file changed, 10 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml b/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml
>> index 18fb471aa891..6f5f01bec6f1 100644
>> --- a/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml
>> +++ b/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml
>> @@ -85,11 +85,20 @@ properties:
>>         boost-cap-microfarad.
>>         External Boost must have GPIO1 as GPIO output. GPIO1 will be set high to
>>         enable boost voltage.
>> +      Shared boost allows two amplifiers to share a single boost circuit by
>> +      communicating on the MDSYNC bus. The passive amplifier does not control
>> +      the boost and receives data from the active amplifier. GPIO1 should be
>> +      configured for Sync when shared boost is used. Shared boost is not
>> +      compatible with External boost. Active amplifier requires
>> +      boost-peak-milliamp, boost-ind-nanohenry and boost-cap-microfarad.
>>         0 = Internal Boost
>>         1 = External Boost
>> +      2 = Reserved
> 
> How binding can be reserved? For what and why? Drop. 2 is shared active,
> 3 is shared passive.
2 Is shared boost without VSPK switch, a mode not supported for new 
system designs. But there is laptops using it, so we need to keep 
supporting in the driver.

> 
> Best regards,
> Krzysztof
>