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hc

2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
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@@ -7,12 +7,15 @@
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  - reg: PHY register address offset and length in "general
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    register files"
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-Optional clocks using the clock bindings (see ../clock/clock-bindings.txt),
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-specified by name:
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+Optional properties:
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  - clock-names: Should contain "emmcclk".  Although this is listed as optional
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 		(because most boards can get basic functionality without having
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 		access to it), it is strongly suggested.
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+		See ../clock/clock-bindings.txt for details.
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  - clocks: Should have a phandle to the card clock exported by the SDHCI driver.
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+ - drive-impedance-ohm: Specifies the drive impedance in Ohm.
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+                        Possible values are 33, 40, 50, 66 and 100.
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+                        If not set, the default value of 50 will be applied.
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 Example:
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@@ -29,6 +32,7 @@
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 		reg = <0xf780 0x20>;
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 		clocks = <&sdhci>;
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 		clock-names = "emmcclk";
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+		drive-impedance-ohm = <50>;
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 		#phy-cells = <0>;
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 	};
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 };