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Message-Id: <1483608682-226716-1-git-send-email-shawn.lin@rock-chips.com>
Date: Thu, 5 Jan 2017 17:31:21 +0800
From: Shawn Lin <shawn.lin@...k-chips.com>
To: Kishon Vijay Abraham I <kishon@...com>
Cc: Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
linux-rockchip@...ts.infradead.org,
Heiko Stuebner <heiko@...ech.de>,
Douglas Anderson <dianders@...omium.org>,
linux-kernel@...r.kernel.org, Shawn Lin <shawn.lin@...k-chips.com>
Subject: [PATCH 1/2] Documentation: phy: introduce new optional property to specify drive impedance
We need to modify the drive impedance according to the
different hardware condition. So let's expose this to
the DT.
Signed-off-by: Shawn Lin <shawn.lin@...k-chips.com>
---
Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
index e3ea557..731aeb9 100644
--- a/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
+++ b/Documentation/devicetree/bindings/phy/rockchip-emmc-phy.txt
@@ -14,6 +14,11 @@ specified by name:
access to it), it is strongly suggested.
- clocks: Should have a phandle to the card clock exported by the SDHCI driver.
+Optional Properties:
+- drive_impedance: Must be one of 33, 40, 50, 66, 100. This property allows
+ different boards to specify their own drive impedance depending on the
+ hardware condition.
+
Example:
--
1.9.1
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