From 69c3d58dc187061a041ae76190ad604dc27c13a3 Mon Sep 17 00:00:00 2001 From: Tinghan Shen Date: Wed, 16 Feb 2022 19:31:30 +0800 Subject: [PATCH] dt-bindings: pinctrl: mt8195: Add mediatek,drive-strength-adv property Extend driving support for I2C pins on SoC mt8195. This property is already documented in mediatek,mt8183-pinctrl.yaml. Signed-off-by: Tinghan Shen Reviewed-by: Rob Herring Reviewed-by: AngeloGioacchino Del Regno Link: https://lore.kernel.org/r/20220216113131.13145-3-tinghan.shen@mediatek.com Signed-off-by: Linus Walleij --- .../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 8299662..c5b7555 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 = , + ; + bias-disable; + mediatek,drive-strength-adv = <7>; + }; + }; }; -- 2.7.4