Extend pin driving support for I2C pins on SoC mt8195.
This property is also documented in mediatek,mt8183-pinctrl.yaml.
Signed-off-by: Tinghan Shen <tinghan.shen@xxxxxxxxxxxx>
---
.../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 567f71cab7b4..5e27e01d6588 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
@@ -265,4 +291,13 @@ examples:
bias-pull-down;
};
};
+
+ i2c0-pins {
+ pins {
+ pinmux = <PINMUX_GPIO8__FUNC_SDA0>,
+ <PINMUX_GPIO9__FUNC_SCL0>;
+ bias-disable;
+ mediatek,drive-strength-adv = <7>;
+ };
+ };
};
--
2.18.0
