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| -rw-r--r-- | Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt index 73eda5620190..ea456c489834 100644 --- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt +++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt @@ -16,6 +16,9 @@ Optional Properties: If not assigned any freq, default use 200000000Hz. - dr-sel: select the drive strength of phy IO. - opdelay: select the output delay count number for clk IO and data IO + - drive-impedance-ohm: Specifies the drive impedance in Ohm. + Possible values are 33, 40, 50, 66 and 100. + If not set, the default value of 50 will be applied. Example: |