[PATCH 1/2] Documentation: phy: introduce new optional property to specify drive impedance
shawn.lin at rock-chips.com
Thu Jan 5 01:31:21 PST 2017
We need to modify the drive impedance according to the
different hardware condition. So let's expose this to
Signed-off-by: Shawn Lin <shawn.lin at rock-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
@@ -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.
+- 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.
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