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dt-bindings: pinctrl: mt8192: Add mediatek,drive-strength-adv property 

Add the mediatek,drive-strength-adv property to the pinctrl-mt8192
dt-binding to allow further drive current adjustments for I2C nodes on
MT8192. It is the same as in mt8183-pinctrl.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220315211936.442708-3-nfraprado@collabora.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Nícolas F. R. A. Prado 2022-03-15 17:19:34 -04:00 committed by Linus Walleij
parent 1c5fdf0f79
commit 4ac68333ff
1 changed files with 26 additions and 0 deletions
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26
Documentation/devicetree/bindings/pinctrl/pinctrl-mt8192.yaml
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@ -78,6 +78,32 @@ patternProperties:
dt-bindings/pinctrl/mt65xx.h. It can only support 2/4/6/8/10/12/14/16mA in mt8192.
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: true
bias-pull-up: true