On Mon, Mar 21, 2016 at 12:32:27PM -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 > Freescale-provided document: > https://community.freescale.com/message/566147#comment-566912 > > Signed-off-by: Jaret Cantu <jaret.cantu@xxxxxxxxxxx> > --- > 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 ++++ > drivers/usb/phy/phy-mxs-usb.c | 58 ++++++++++++++++++++ > 2 files changed, 68 insertions(+) Acked-by: Rob Herring <robh@xxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
