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Date: Wed, 14 Sep 2022 14:07:41 +0800 From: Chunfeng Yun <chunfeng.yun@...iatek.com> To: Vinod Koul <vkoul@...nel.org> CC: Chunfeng Yun <chunfeng.yun@...iatek.com>, Kishon Vijay Abraham I <kishon@...com>, Rob Herring <robh+dt@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Matthias Brugger <matthias.bgg@...il.com>, <linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>, <linux-phy@...ts.infradead.org>, <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, Eddie Hung <eddie.hung@...iatek.com>, AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> Subject: [PATCH v3 2/7] dt-bindings: phy: mediatek,tphy: add property to set pre-emphasis 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@...aro.org> Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com> --- v3: add acked-by Krzysztof v2: Add more description suggested by Krzysztof --- .../devicetree/bindings/phy/mediatek,tphy.yaml | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml index 848edfb1f677..e0754fb44451 100644 --- a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml +++ b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml @@ -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 -- 2.18.0
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