We need to modify the drive impedance according to the different hardware condition. So let's expose this to the DT. Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com> --- Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt index e3ea557..731aeb9 100644 --- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt +++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt @@ -14,6 +14,11 @@ specified by name: access to it), it is strongly suggested. - clocks: Should have a phandle to the card clock exported by the SDHCI driver. +Optional Properties: +- drive_impedance: Must be one of 33, 40, 50, 66, 100. This property allows + different boards to specify their own drive impedance depending on the + hardware condition. + Example: -- 1.9.1
