From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rob Herring Subject: Re: [PATCH] usb: phy: mxs: Add DT bindings to configure TX settings Date: Thu, 18 Aug 2016 14:27:14 -0500 Message-ID: <20160818192714.GA32621@rob-hp-laptop> References: <0160614020657.GA25052@shlinux2> <1471386708-26350-1-git-send-email-jaret.cantu@timesys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <1471386708-26350-1-git-send-email-jaret.cantu-jEh4hwF5bVhBDgjK7y7TUQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Jaret Cantu Cc: linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, balbi-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, hzpeterchen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org List-Id: devicetree@vger.kernel.org On Tue, Aug 16, 2016 at 06:31:48PM -0400, Jaret Cantu wrote: > The TX settings can be calibrated for particular hardware. The > phy is reset by Linux, so this cannot be handled by the bootloader. > > The TRM mentions that the maximum resistance should be used for the > DN/DP calibration in order to pass USB certification. > > The values for the TX registers are poorly described in the TRM. > The meanings of the register values were taken from another > NXP-provided document: > https://community.nxp.com/message/566147#comment-566912 > > Signed-off-by: Jaret Cantu > --- > v4. Corrected tx-d-cal register value by rounding up. > Changed Freescale web site reference to NXP. > > v3. Added unit suffix (-ohms) to tx-cal-45-d* > > v2. Copying devicetree list > Removed prettifying extra whitespace > Removed unnecessary register rewrite on resume > Use min and max constants for clarity > > .../devicetree/bindings/phy/mxs-usb-phy.txt | 10 ++++ Acked-by: Rob Herring > drivers/usb/phy/phy-mxs-usb.c | 61 ++++++++++++++++++++ > 2 files changed, 71 insertions(+) -- 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