Messages in this thread Patch in this message | | | From | Christoph Muellner <> | Subject | [PATCH v3 2/4] dt-bindings: phy: Add a new property drive-impedance-ohm for RK's emmc PHY | Date | Fri, 22 Mar 2019 12:34:51 +0100 |
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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> --- Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt index e3ea55763b0a..e728786f21e0 100644 --- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt +++ b/Documentation/devicetree/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>; }; }; -- 2.11.0
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