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dt-bindings: phy: mediatek,tphy: add property to set pre-emphasis

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Add a property to set usb2 phy's pre-emphasis, which used to widen eye
opening and boost eye swing.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20220914060746.10004-2-chunfeng.yun@mediatek.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Chunfeng Yun 2022-09-14 14:07:41 +08:00 committed by Vinod Koul
parent 0d14f49126
commit 54511f207c
1 changed files with 10 additions and 0 deletions
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10
Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
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@ -219,6 +219,16 @@ patternProperties:
minimum: 1
maximum: 15
mediatek,pre-emphasis:
description:
The level of pre-emphasis which used to widen the eye opening and
boost eye swing, the unit step is about 4.16% increment; e.g. the
level 1 means amplitude increases about 4.16%, the level 2 is about
8.3% etc. (U2 phy)
$ref: /schemas/types.yaml#/definitions/uint32
minimum: 1
maximum: 3
mediatek,bc12:
description:
Specify the flag to enable BC1.2 if support it