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From:   Christoph Muellner <christoph.muellner@theobroma-systems.com>
To:     robh+dt@kernel.org, mark.rutland@arm.com, heiko@sntech.de,
        shawn.lin@rock-chips.com
Cc:     Christoph Muellner <christoph.muellner@theobroma-systems.com>,
        Philipp Tomsich <philipp.tomsich@theobroma-systems.com>,
        Kishon Vijay Abraham I <kishon@ti.com>,
        Matthias Brugger <mbrugger@suse.com>,
        Klaus Goger <klaus.goger@theobroma-systems.com>,
        Enric Balletbo i Serra <enric.balletbo@collabora.com>,
        Douglas Anderson <dianders@chromium.org>,
        Viresh Kumar <viresh.kumar@linaro.org>,
        Jeffy Chen <jeffy.chen@rock-chips.com>,
        Randy Li <ayaka@soulik.info>,
        Tony Xie <tony.xie@rock-chips.com>,
        Vicente Bergas <vicencb@gmail.com>,
        Ezequiel Garcia <ezequiel@collabora.com>,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-rockchip@lists.infradead.org
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
Message-Id: <20190322113456.16324-2-christoph.muellner@theobroma-systems.com>
In-Reply-To: <20190322113456.16324-1-christoph.muellner@theobroma-systems.com>
References: <20190322113456.16324-1-christoph.muellner@theobroma-systems.com>
Sender: linux-kernel-owner@vger.kernel.org
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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