summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorChristoph Muellner <christoph.muellner@theobroma-systems.com>2019-03-01 17:15:31 +0100
committerChristoph Muellner <christoph.muellner@theobroma-systems.com>2019-05-21 18:23:42 +0200
commit1560f21c4ffe10824f3a7eab69e6a557f69ec83f (patch)
treecf3b7cd5ac33af598985eccad9ec0fc950857709
parent34035db3450d08a7650cd201abef973e18e3bc74 (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: