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dt-bindings: phy-mtk-tphy: add properties for phy tuning

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Add properties to improve eye diagram which sometimes need adjust
some parameters of u2phy;
Add a property to tune disconnect threshold;

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
This commit is contained in:
Chunfeng Yun 2023-12-13 14:41:33 +08:00 • committed by Tom Rini
parent 2ee7a8ec6f
commit 69600f4156
1 changed files with 9 additions and 0 deletions
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9
doc/device-tree-bindings/phy/phy-mtk-tphy.txt
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@ -52,6 +52,15 @@ Optional properties (port (child) node):
"da_ref": the reference clock of analog phy, used if the clocks
of analog and digital phys are separated, otherwise uses
"ref" clock only if needed.
- mediatek,eye-vrt : The selection of VRT reference voltage (U2 phy),
the value is [1, 7]
- mediatek,eye-term : The selection of HS_TX TERM reference voltage (U2 phy),
the value is [1, 7]
- mediatek,discth : The selection of disconnect threshold (U2 phy),
the value is [1, 15]
- mediatek,pre-emphasis : The level of pre-emphasis which used to widen
the eye opening and boost eye swing,
the value is [1, 3]
Example: