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Date:   Fri,  1 Mar 2019 17:21:43 +0100
From:   Christoph Muellner <>
Cc:     Christoph Muellner <>,
        Philipp Tomsich <>,
        Kishon Vijay Abraham I <>,,,,
Subject: [PATCH] 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 e3ea55763b0a..5f5d999dacc3 100644
--- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
+++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
@@ -13,6 +13,9 @@ specified by name:
 		(because most boards can get basic functionality without having
 		access to it), it is strongly suggested.
  - clocks: Should have a phandle to the card clock exported by the SDHCI driver.
+ - 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.

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