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dt-bindings: phy: Add a new property drive-impedance-ohm for RK's emmc PHY

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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>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Christoph Muellner 2019-03-22 12:34:51 +01:00 committed by Kishon Vijay Abraham I
parent 043f42edbf
commit 2c1a4b0cbe
1 changed files with 6 additions and 2 deletions
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8
Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
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@ -7,12 +7,15 @@ Required properties:
- reg: PHY register address offset and length in "general - reg: PHY register address offset and length in "general
register files" register files"
Optional clocks using the clock bindings (see ../clock/clock-bindings.txt), Optional properties:
specified by name:
- clock-names: Should contain "emmcclk". Although this is listed as optional - clock-names: Should contain "emmcclk". Although this is listed as optional
(because most boards can get basic functionality without having (because most boards can get basic functionality without having
access to it), it is strongly suggested. 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. - 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: Example:
@ -29,6 +32,7 @@ grf: syscon@ff770000 {
reg = <0xf780 0x20>; reg = <0xf780 0x20>;
clocks = <&sdhci>; clocks = <&sdhci>;
clock-names = "emmcclk"; clock-names = "emmcclk";
drive-impedance-ohm = <50>;
#phy-cells = <0>; #phy-cells = <0>;
}; };
}; };