linux-kernel - Re: [PATCH] dt-bindings: pinctrl: qcom,pmic-mpp: Fix schema for "qcom,paired"

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Date:   Wed, 19 Apr 2023 21:56:16 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Rob Herring <robh@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: pinctrl: qcom,pmic-mpp: Fix schema for
 "qcom,paired"

On 18/04/2023 17:06, Rob Herring wrote:
> The "qcom,paired" schema is all wrong. First, it's a list rather than an
> object(dictionary). Second, it is missing a required type. The meta-schema
> normally catches this, but schemas under "$defs" was not getting checked.
> A fix for that is pending.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>
> ---
>  Documentation/devicetree/bindings/pinctrl/qcom,pmic-mpp.yaml | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/qcom,pmic-mpp.yaml b/Documentation/devicetree/bindings/pinctrl/qcom,pmic-mpp.yaml
> index 9412b9362328..4c3e9ff82105 100644
> --- a/Documentation/devicetree/bindings/pinctrl/qcom,pmic-mpp.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/qcom,pmic-mpp.yaml
> @@ -144,8 +144,9 @@ $defs:
>          enum: [0, 1, 2, 3, 4, 5, 6, 7]
>  
>        qcom,paired:
> -        - description:
> -            Indicates that the pin should be operating in paired mode.
> +        type: boolean
> +        description:
> +          Indicates that the pin should be operating in paired mode.

Current Linux implementation uses it as a generic pinconf param
pinconf_generic_params which is parsed by:

pinconf_generic_parse_dt_config() -> parse_dt_cfg() ->
of_property_read_u32()


The pinctrl-spmi-mpp.c driver, using this schema, treat it as a bool,
but I still wonder how the code will parse bool with
of_property_read_u32(). Maybe it should be uint32 with value of 0 and 1?

Best regards,
Krzysztof