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authorChristoph Muellner <christoph.muellner@theobroma-systems.com>2019-03-01 17:15:31 +0100
committerChristoph Muellner <christoph.muellner@theobroma-systems.com>2019-10-02 00:39:29 +0200
commit82be2f2211a0bec01f531665d5316614381c583d (patch)
tree390d661c6fd2911cb810d0aaf1d6428ea75c6e7f
parentcbe27a5ceb90dddbc0eb6a38b66c3a68faacf9b0 (diff)
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 <christoph.muellner@theobroma-systems.com> Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
-rw-r--r--Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt3
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: