| Message ID | 20200717042226.18495-1-peter.chen@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/4] doc: dt-binding: ci-hdrc-usb2: add property for imx picophy | expand |
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@nxp.com> > Signed-off-by: Peter Chen <peter.chen@nxp.com> > --- > 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 >
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 + 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. +- 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. Example: