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@xxxxxxxxxxxx> Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
--- .../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>; + }; + }; };
