linux-kernel - Re: [PATCH v9 2/3] dt-bindings: pinctrl: mt8195: Add mediatek,drive-strength-adv property

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Date:   Thu, 13 Jan 2022 17:31:57 +0100
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Tinghan Shen <tinghan.shen@...iatek.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        David Matlack <dmatlack@...gle.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sean Wang <sean.wang@...iatek.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        ryder.lee@...nel.org, wenst@...omium.org, chunfeng.yun@...iatek.com
Subject: Re: [PATCH v9 2/3] dt-bindings: pinctrl: mt8195: Add
 mediatek,drive-strength-adv property

[dopping Maciej, Paolo and Sean Christopherson]

On 12/01/2022 12:47, Tinghan Shen wrote:
> Extend driving support for I2C pins on SoC mt8195.
> This property is already documented in mediatek,mt8183-pinctrl.yaml.
> 
> Signed-off-by: Tinghan Shen <tinghan.shen@...iatek.com>
> Reviewed-by: Rob Herring <robh@...nel.org>

Looks good to me. Linus please let me know when you are queuing this patch and 
I'll take the rest of the series. Another option is, that you provide an 
Acked-by and I can take the whole set through my branch.

Regards,
Matthias

> ---
>   .../bindings/pinctrl/pinctrl-mt8195.yaml      | 35 +++++++++++++++++++
>   1 file changed, 35 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> index 328ea59c5466..4db4899af6b1 100644
> --- a/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> +++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-mt8195.yaml
> @@ -98,6 +98,32 @@ 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]
> +
>             bias-pull-down:
>               description: |
>                 For pull down type is normal, it don't need add RSEL & R1R0 define
> @@ -268,4 +294,13 @@ examples:
>             bias-pull-down;
>           };
>         };
> +
> +      i2c0-pins {
> +        pins {
> +          pinmux = <PINMUX_GPIO8__FUNC_SDA0>,
> +                   <PINMUX_GPIO9__FUNC_SCL0>;
> +          bias-disable;
> +          mediatek,drive-strength-adv = <7>;
> +        };
> +      };
>       };
>