From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: Re: [PATCH 1/2] Documentation: phy: introduce new optional property to specify drive impedance Date: Mon, 9 Jan 2017 12:06:27 -0600 Message-ID: <20170109180627.uhkfnyxunksp3s6q@rob-hp-laptop> References: <1483608682-226716-1-git-send-email-shawn.lin@rock-chips.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1483608682-226716-1-git-send-email-shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Shawn Lin Cc: Kishon Vijay Abraham I , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-rockchip-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Heiko Stuebner , Douglas Anderson , linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: devicetree@vger.kernel.org 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 > --- > > 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 > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html