From d0f8c46c8694791395d3f77e58e051b259aff188 Mon Sep 17 00:00:00 2001 From: Christoph Muellner Date: Fri, 1 Mar 2019 17:15:31 +0100 Subject: dt-bindings: phy: Add a new property drive-impedance-ohm for RK's emmc PHY This patch documents the new proprty drive-impedance-ohm for Rockchip's eMMC PHY node. Signed-off-by: Christoph Muellner Signed-off-by: Philipp Tomsich --- Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 3 +++ 1 file changed, 3 insertions(+) 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: -- cgit v1.2.3