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SubjectRe: [PATCH v11 2/3] dt-bindings: pinctrl: mt8195: Add mediatek,drive-strength-adv property
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Il 16/02/22 12:31, Tinghan Shen ha scritto:
> 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@mediatek.com>
> Reviewed-by: Rob Herring <robh@kernel.org>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

> ---
> .../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 8299662c2c09..c5b755514c46 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:
> oneOf:
> - type: boolean
> @@ -270,4 +296,13 @@ examples:
> bias-pull-down;
> };
> };
> +
> + i2c0-pins {
> + pins {
> + pinmux = <PINMUX_GPIO8__FUNC_SDA0>,
> + <PINMUX_GPIO9__FUNC_SCL0>;
> + bias-disable;
> + mediatek,drive-strength-adv = <7>;
> + };
> + };
> };

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