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-rw-r--r--dts/Bindings/phy/rockchip-emmc-phy.txt8
1 files changed, 6 insertions, 2 deletions
diff --git a/dts/Bindings/phy/rockchip-emmc-phy.txt b/dts/Bindings/phy/rockchip-emmc-phy.txt
index e3ea557..e728786 100644
--- a/dts/Bindings/phy/rockchip-emmc-phy.txt
+++ b/dts/Bindings/phy/rockchip-emmc-phy.txt
@@ -7,12 +7,15 @@ Required properties:
- reg: PHY register address offset and length in "general
register files"
-Optional clocks using the clock bindings (see ../clock/clock-bindings.txt),
-specified by name:
+Optional properties:
- clock-names: Should contain "emmcclk". Although this is listed as optional
(because most boards can get basic functionality without having
access to it), it is strongly suggested.
+ See ../clock/clock-bindings.txt for details.
- 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.
Example:
@@ -29,6 +32,7 @@ grf: syscon@ff770000 {
reg = <0xf780 0x20>;
clocks = <&sdhci>;
clock-names = "emmcclk";
+ drive-impedance-ohm = <50>;
#phy-cells = <0>;
};
};