linux-kernel - Re: [PATCH] dt-bindings: pinctrl: mt8195: Add and use drive-strength-microamp

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Date:   Tue, 5 Jul 2022 12:49:49 -0400
From:   Nícolas F. R. A. Prado 
        <nfraprado@...labora.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     linus.walleij@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, matthias.bgg@...il.com,
        sean.wang@...iatek.com, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: pinctrl: mt8195: Add and use
 drive-strength-microamp

On Thu, Jun 30, 2022 at 03:15:43PM +0200, AngeloGioacchino Del Regno wrote:
> As was already done for MT8192 in commit b52e695324bb ("dt-bindings:
> pinctrl: mt8192: Add drive-strength-microamp"), replace the custom
> mediatek,drive-strength-adv property with the standardized pinconf
> 'drive-strength-microamp' one.
> 
> Similarly to the mt8192 counterpart, there's no user of property
> 'mediatek,drive-strength-adv', hence removing it is safe.
> 
> Fixes: 69c3d58dc187 ("dt-bindings: pinctrl: mt8195: Add mediatek,drive-strength-adv property")
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>

Ideally we'd prevent using drive-strength-microamp together with drive-strength,
like I intended to do on v2 of the patch [1], just as an extra sanity check. But
that could be added later on top, so

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@...labora.com>

Thanks,
Nícolas

[1] https://lore.kernel.org/all/20220531221954.160036-2-nfraprado@collabora.com/

> ---
>  .../bindings/pinctrl/pinctrl-mt8195.yaml      | 27 ++-----------------
>  1 file changed, 2 insertions(+), 25 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> index b0fea44403e7..85e96a5e1708 100644
> --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> @@ -100,31 +100,8 @@ patternProperties:
>            drive-strength:
>              enum: [2, 4, 6, 8, 10, 12, 14, 16]
>  
> -          mediatek,drive-strength-adv:
> -            description: |
> -              Describe the specific driving setup property.
> -              For I2C pins, the existing generic driving setup can only support
> -              2/4/6/8/10/12/14/16mA driving. But in specific driving setup, they
> -              can support 0.125/0.25/0.5/1mA adjustment. If we enable specific
> -              driving setup, the existing generic setup will be disabled.
> -              The specific driving setup is controlled by E1E0EN.
> -              When E1=0/E0=0, the strength is 0.125mA.
> -              When E1=0/E0=1, the strength is 0.25mA.
> -              When E1=1/E0=0, the strength is 0.5mA.
> -              When E1=1/E0=1, the strength is 1mA.
> -              EN is used to enable or disable the specific driving setup.
> -              Valid arguments are described as below:
> -              0: (E1, E0, EN) = (0, 0, 0)
> -              1: (E1, E0, EN) = (0, 0, 1)
> -              2: (E1, E0, EN) = (0, 1, 0)
> -              3: (E1, E0, EN) = (0, 1, 1)
> -              4: (E1, E0, EN) = (1, 0, 0)
> -              5: (E1, E0, EN) = (1, 0, 1)
> -              6: (E1, E0, EN) = (1, 1, 0)
> -              7: (E1, E0, EN) = (1, 1, 1)
> -              So the valid arguments are from 0 to 7.
> -            $ref: /schemas/types.yaml#/definitions/uint32
> -            enum: [0, 1, 2, 3, 4, 5, 6, 7]
> +          drive-strength-microamp:
> +            enum: [125, 250, 500, 1000]
>  
>            bias-pull-down:
>              oneOf:
> -- 
> 2.35.1
>