linux-kernel - Re: [PATCH v2 03/11] dt-bindings: regulator: pca9450: Document nxp,sd-vsel-fixed-low property for LDO5

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Message-ID: <20241128-endanger-envy-d1b19f650b38@spud>
Date: Thu, 28 Nov 2024 17:33:30 +0000
From: Conor Dooley <conor@...nel.org>
To: Frieder Schrempf <frieder@...s.de>
Cc: linux-arm-kernel@...ts.infradead.org, Marek Vasut <marex@...x.de>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>, linux-kernel@...r.kernel.org,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robin Gong <yibin.gong@....com>,
	Frieder Schrempf <frieder.schrempf@...tron.de>,
	Joy Zou <joy.zou@....com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: Re: [PATCH v2 03/11] dt-bindings: regulator: pca9450: Document
 nxp,sd-vsel-fixed-low property for LDO5

On Wed, Nov 27, 2024 at 05:42:19PM +0100, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> This new property can be used for boards which have the SD_VSEL tied
> to a fixed low level. The voltage of LDO5 is therefore only controlled
> by writing to the LDO5CTRL_L register.
> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
> ---
> Changes for v2:
> * new patch
> ---
>  .../bindings/regulator/nxp,pca9450-regulator.yaml           | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
> index 5d0d684186c96..0e19c54aa5f8a 100644
> --- a/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
> +++ b/Documentation/devicetree/bindings/regulator/nxp,pca9450-regulator.yaml
> @@ -49,6 +49,12 @@ properties:
>            Properties for single LDO5 regulator.
>  
>          properties:
> +          nxp,sd-vsel-fixed-low:
> +            type: boolean
> +            description:
> +              Let the driver know that SD_VSEL is hardwired to low level and
> +              there is no GPIO to get the actual value from.

Does this mean that if you don't provide the property or a GPIO it is tied
high or High-Z? If so, please mention it here. More likely, given the
context of this patch, no gpio and no tied low property means the driver
should handle things as they used to be - but you should call that out
in your commit message to be clear.

> +
>            sd-vsel-gpios:
>              description:
>                GPIO that can be used to read the current status of the SD_VSEL
> -- 
> 2.46.1
> 

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