linux-kernel - Re: [PATCH 1/6] dt-bindings: regulator: pca9450: Document new usage of sd-vsel-gpios

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Date:   Thu, 16 Feb 2023 02:27:32 +0100
From:   Marek Vasut <marex@...x.de>
To:     Rob Herring <robh@...nel.org>, Frieder Schrempf <frieder@...s.de>
Cc:     devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>,
        Robin Gong <yibin.gong@....com>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Per-Daniel Olsson <perdo@...s.com>,
        Rickard x Andersson <rickaran@...s.com>
Subject: Re: [PATCH 1/6] dt-bindings: regulator: pca9450: Document new usage
 of sd-vsel-gpios

On 2/15/23 21:02, Rob Herring wrote:
> On Mon, Feb 13, 2023 at 04:58:19PM +0100, Frieder Schrempf wrote:
>> From: Frieder Schrempf <frieder.schrempf@...tron.de>
>>
>> The sd-vsel-gpios property is abandoned in its current meaning as an
>> output. We now use it to specify an optional signal that can be
>> evaluated by the driver in order to retrieve the current status
>> of the SD_VSEL signal that is used to select the control register
>> of LDO5.
>>
>> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
>> ---
>>   .../regulator/nxp,pca9450-regulator.yaml      | 23 ++++++++++++++-----
>>   1 file changed, 17 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
>> index 835b53302db8..c86534538a4e 100644
>> --- a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
>> +++ b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
>> @@ -40,8 +40,24 @@ properties:
>>       description: |
>>         list of regulators provided by this controller
>>   
>> +    properties:
>> +      LDO5:
>> +        type: object
>> +        $ref: regulator.yaml#
>> +        description:
>> +          Properties for single LDO5 regulator.
>> +
>> +        properties:
>> +          sd-vsel-gpios:
> 
> It is a pin on the device, right? Then it belongs in the device node as
> it was.
> 
> Can't the direction of the signal tell you how it is used? Assuming the
> pin is bidirectional?

The pin is input to the PMIC, it is unidirection, i.e.

SoC(output)---->(input)PMIC

> The binding should support any possible way the device is wired, not
> just what's been seen so far on some boards.

The usage is always the above as far as I can tell.