linux-kernel - Re: [PATCH v2 3/3] dt-bindings: mfd: stpmic1: add fsl,pmic-poweroff property

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Date:   Tue, 16 May 2023 19:06:35 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Sean Nyekjaer <sean@...nix.com>
Cc:     robh+dt@...nel.org, Lee Jones <lee@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        pascal Paillet <p.paillet@...s.st.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] dt-bindings: mfd: stpmic1: add fsl,pmic-poweroff
 property

Hey Sean,

On Tue, May 16, 2023 at 03:22:24PM +0200, Sean Nyekjaer wrote:
> Document the new optional "fsl,pmic-poweroff" property.
> 
> Signed-off-by: Sean Nyekjaer <sean@...nix.com>
> ---
>  Documentation/devicetree/bindings/mfd/st,stpmic1.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/st,stpmic1.yaml b/Documentation/devicetree/bindings/mfd/st,stpmic1.yaml
> index 9573e4af949e..5183a7c660d2 100644
> --- a/Documentation/devicetree/bindings/mfd/st,stpmic1.yaml
> +++ b/Documentation/devicetree/bindings/mfd/st,stpmic1.yaml
> @@ -26,6 +26,14 @@ properties:
>  
>    interrupt-controller: true
>  
> +  st,pmic-poweroff:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      if present, configure the PMIC to shutdown all power rails when
> +      power off sequence have finished.
> +      Use this option if the SoC should be powered off by external power management
> +      IC (PMIC).

Just reading this description, this is sounding quite like a "software
behaviour" type of property, which are not permitted, rather than
describing some element of the hardware. Clearly you are trying to solve
an actual problem though, so try re-phrasing the description (and
property name) to focus on what exact hardware configuration it is that
you are trying to special-case.
Krzysztof suggested that the samsung,s2mps11-acokb-ground property in
samsung,s2mps11.yaml is addressing a similar problem, so that could be
good to look at.

Also, the dt-binding patch should go before the patch adding the
property to the driver.

Thanks,
Conor.

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