On Fri, Jul 17, 2020 at 12:22:23PM +0800, Peter Chen wrote: > Add two parameters which are used to tune USB signal for imx picophy, > picophy is used at imx7d, imx8mm, and imx8mn. > > Reviewed-by: Jun Li <jun.li@xxxxxxx> > Signed-off-by: Peter Chen <peter.chen@xxxxxxx> > --- > No changes for v2. > > Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > index 51376cbe5f3d..e9858dafb08f 100644 > --- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > @@ -100,6 +100,13 @@ i.mx specific properties > It's recommended to specify the over current polarity. > - power-active-high: power signal polarity is active high > - external-vbus-divider: enables off-chip resistor divider for Vbus > +- picophy,pre-emp-curr-control: HS Transmitter Pre-Emphasis Current Form is <vendor>,<prop-name> and picophy is not a vendor. > + Control. This signal controls the amount of current sourced to the > + USB_OTG*_DP and USB_OTG*_DN pins after a J-to-K or K-to-J transition. > + Details can refer to TXPREEMPAMPTUNE0 bits of USBNC_n_PHY_CFG1. What's the range of values? What's the default if not specified? > +- picophy,dc-vol-level-adjust: HS DC Voltage Level Adjustment. > + Adjust the high-speed transmitter DC level voltage, details can refer > + to TXVREFTUNE0 bits of USBNC_n_PHY_CFG1. Same comments here. > > Example: > > -- > 2.17.1 >
