On Thu, Jan 05, 2017 at 05:31:21PM +0800, Shawn Lin wrote: > 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....@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 > --- 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.
Needs a vendor prefix. Don't use '_'. And needs unit suffix (-ohms). > + > Example: > > > -- > 1.9.1 > >
