If want to do training outside DP Firmware, need phy voltage swing
and pre_emphasis value.

Signed-off-by: Lin Huang <h...@rock-chips.com>
---
 Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt 
b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
index 960da7f..eda26dd 100644
--- a/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
+++ b/Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
@@ -17,7 +17,9 @@ Required properties:
 
 Optional properties:
  - extcon : extcon specifier for the Power Delivery
-
+ - rockchip,phy_config : That's phy voltage swing and pre_emphasis
+                        setting, if want to do dp training outside
+                        dp firmware, need to add these value.
 Required nodes : a sub-node is required for each port the phy provides.
                 The sub-node name is used to identify dp or usb3 port,
                 and shall be the following entries:
-- 
2.7.4

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