linux-kernel - Re: [PATCH v3 15/16] ASoC: dt-bindings: cs35l41: Document CS35l41 External Boost

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Message-ID: <a5fe73dc-1126-0f46-cbc0-1ab864843ea6@opensource.cirrus.com>
Date:   Wed, 9 Mar 2022 09:28:38 +0000
From:   Lucas tanure <tanureal@...nsource.cirrus.com>
To:     Rob Herring <robh@...nel.org>
CC:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, <alsa-devel@...a-project.org>,
        <patches@...nsource.cirrus.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        David Rhodes <drhodes@...nsource.cirrus.com>
Subject: Re: [PATCH v3 15/16] ASoC: dt-bindings: cs35l41: Document CS35l41
 External Boost

On 3/9/22 01:20, Rob Herring wrote:
> On Tue, Mar 08, 2022 at 05:17:29PM +0000, Lucas Tanure wrote:
>> From: David Rhodes <drhodes@...nsource.cirrus.com>
>>
>> Document internal and external boost feature for ASoC CS35L41.
>> For internal boost the following properties are required:
>> - cirrus,boost-peak-milliamp
>> - cirrus,boost-ind-nanohenry
>> - cirrus,boost-cap-microfarad
>>
>> For external boost, the GPIO1 must be configured as output,
>> so the following properties are required:
>> - cirrus,gpio1-src-select = <1>
>> - cirrus,gpio1-output-enable
>>
>> Signed-off-by: David Rhodes <drhodes@...nsource.cirrus.com>
>> Signed-off-by: Lucas Tanure <tanureal@...nsource.cirrus.com>
>> ---
>>   .../bindings/sound/cirrus,cs35l41.yaml        | 44 +++++++++++++++++--
>>   1 file changed, 41 insertions(+), 3 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml b/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml
>> index 3235702ce402..09b515924c59 100644
>> --- a/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml
>> +++ b/Documentation/devicetree/bindings/sound/cirrus,cs35l41.yaml
>> @@ -75,6 +75,19 @@ properties:
>>       maximum: 3
>>       default: 2
>>   
>> +  cirrus,boost-type:
>> +    description:
>> +      Configures the type of Boost being used.
>> +      Internal boost requires boost-peak-milliamp, boost-ind-nanohenry and
>> +      boost-cap-microfarad.
>> +      External Boost must have GPIO1 as GPIO output. GPIO1 will be set high to
>> +      enable boost voltage.
>> +      0 = Internal Boost
>> +      1 = External Boost
>> +    $ref: "/schemas/types.yaml#/definitions/uint32"
>> +    minimum: 0
>> +    maximum: 1
> 
> What does not present mean? Might be better to make this boolean depending
> on what you are trying to accomplish.
Not present means Internal boost. There will be other types of boost in 
the future, so I would like to keep it as is.

> 
>> +
>>     cirrus,gpio1-polarity-invert:
>>       description:
>>         Boolean which specifies whether the GPIO1
>> @@ -131,9 +144,32 @@ required:
>>     - compatible
>>     - reg
>>     - "#sound-dai-cells"
>> -  - cirrus,boost-peak-milliamp
>> -  - cirrus,boost-ind-nanohenry
>> -  - cirrus,boost-cap-microfarad
>> +
>> +allOf:
>> +  - if:
>> +      properties:
>> +        cirrus,boost-type:
>> +            const: 0
> 
> Note that this will be true if cirrus,boost-type is not present. You
> probably want to add 'required'.
Yes, that's expected. We want to continue to support old device trees 
without boost type, and for that case it sets to internal boost.

> 
>> +    then:
>> +      required:
>> +        - cirrus,boost-peak-milliamp
>> +        - cirrus,boost-ind-nanohenry
>> +        - cirrus,boost-cap-microfarad
>> +    else:
>> +      if:
>> +        properties:
>> +          cirrus,boost-type:
>> +            const: 1
>> +      then:
>> +        required:
>> +          - cirrus,gpio1-output-enable
>> +          - cirrus,gpio1-src-select
>> +        properties:
>> +          cirrus,boost-peak-milliamp: false
>> +          cirrus,boost-ind-nanohenry: false
>> +          cirrus,boost-cap-microfarad: false
>> +          cirrus,gpio1-src-select:
>> +            enum: [1]
>>   
>>   additionalProperties: false
>>   
>> @@ -150,6 +186,8 @@ examples:
>>             VA-supply = <&dummy_vreg>;
>>             VP-supply = <&dummy_vreg>;
>>             reset-gpios = <&gpio 110 0>;
>> +
>> +          cirrus,boost-type = <0>;
>>             cirrus,boost-peak-milliamp = <4500>;
>>             cirrus,boost-ind-nanohenry = <1000>;
>>             cirrus,boost-cap-microfarad = <15>;
>> -- 
>> 2.35.1
>>
>>