[PATCH 1/2] dt-bindings: phy-mtk-tphy: add properties for phy tuning

[Chunfeng Yun]

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 at mediatek.com>
---
 doc/device-tree-bindings/phy/phy-mtk-tphy.txt | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/doc/device-tree-bindings/phy/phy-mtk-tphy.txt b/doc/device-tree-bindings/phy/phy-mtk-tphy.txt
index 3042c39d09..300e236b5b 100644
--- a/doc/device-tree-bindings/phy/phy-mtk-tphy.txt
+++ b/doc/device-tree-bindings/phy/phy-mtk-tphy.txt
@@ -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:
 
-- 
2.25.1