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Date: Fri, 22 Mar 2019 12:34:51 +0100 From: Christoph Muellner <christoph.muellner@...obroma-systems.com> To: robh+dt@...nel.org, mark.rutland@....com, heiko@...ech.de, shawn.lin@...k-chips.com Cc: Christoph Muellner <christoph.muellner@...obroma-systems.com>, Philipp Tomsich <philipp.tomsich@...obroma-systems.com>, Kishon Vijay Abraham I <kishon@...com>, Matthias Brugger <mbrugger@...e.com>, Klaus Goger <klaus.goger@...obroma-systems.com>, Enric Balletbo i Serra <enric.balletbo@...labora.com>, Douglas Anderson <dianders@...omium.org>, Viresh Kumar <viresh.kumar@...aro.org>, Jeffy Chen <jeffy.chen@...k-chips.com>, Randy Li <ayaka@...lik.info>, Tony Xie <tony.xie@...k-chips.com>, Vicente Bergas <vicencb@...il.com>, Ezequiel Garcia <ezequiel@...labora.com>, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org Subject: [PATCH v3 2/4] 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 <christoph.muellner@...obroma-systems.com> Signed-off-by: Philipp Tomsich <philipp.tomsich@...obroma-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@...70000 { reg = <0xf780 0x20>; clocks = <&sdhci>; clock-names = "emmcclk"; + drive-impedance-ohm = <50>; #phy-cells = <0>; }; }; -- 2.11.0
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