linux-kernel - Re: [PATCH v3 6/6] regulator: dt-bindings: rtq2208: Add property to get ldo of RTQ2208 is adjustable or not

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Date: Mon, 13 May 2024 17:22:54 +0100
From: Conor Dooley <conor@...nel.org>
To: Alina Yu <alina_yu@...htek.com>
Cc: lgirdwood@...il.com, broonie@...nel.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	johnny_lai@...htek.com, cy_huang@...htek.com
Subject: Re: [PATCH v3 6/6] regulator: dt-bindings: rtq2208: Add property to
 get ldo of RTQ2208 is adjustable or not

On Fri, May 10, 2024 at 08:06:25PM +0800, Alina Yu wrote:
> Since there is no way to check is ldo is adjustable or not.
> As discussing in v2 series, 'richtek,fixed-microvolt' is added for that.
> user is supposed to know whether vout of ldo is adjustable.
> 
> Signed-off-by: Alina Yu <alina_yu@...htek.com>
> ---
>  Documentation/devicetree/bindings/regulator/richtek,rtq2208.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/regulator/richtek,rtq2208.yaml b/Documentation/devicetree/bindings/regulator/richtek,rtq2208.yaml
> index 609c066..6212f44 100644
> --- a/Documentation/devicetree/bindings/regulator/richtek,rtq2208.yaml
> +++ b/Documentation/devicetree/bindings/regulator/richtek,rtq2208.yaml
> @@ -75,6 +75,13 @@ properties:
>          description:
>            regulator description for ldo[1-2].
>  
> +        properties:
> +          richtek,fixed-microvolt:
> +            description: |
> +              If it exists, the voltage is unadjustable.
> +              There is no risk-free method for software to determine whether the ldo vout is fixed or not.
> +              Therefore, it can only be done in this way.
> +
>  required:
>    - compatible
>    - reg
> @@ -177,6 +184,7 @@ examples:
>              };
>            };
>            ldo1 {

> +            richtek,fixed-microvolt = <1200000>;
>              regulator-min-microvolt = <1200000>;
>              regulator-max-microvolt = <1200000>;

I'm dumb and this example seemed odd to me. Can you explain to me why
it is not sufficient to set min-microvolt == max-microvolt to achieve
the same thing?

Cheers,
Conor.

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