| Message ID | 20200724060532.3878-1-peter.chen@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v3,1/4] doc: dt-binding: ci-hdrc-usb2: add property for samsung picophy | expand |
On Fri, 24 Jul 2020 14:05:29 +0800, Peter Chen wrote: > Add two parameters which are used to tune USB signal for samsung picophy, > which is used at imx7d, imx8mm, and imx8mn. > > Reviewed-by: Jun Li <jun.li@nxp.com> > Signed-off-by: Peter Chen <peter.chen@nxp.com> > --- > Changes for v3: > - Changing propery name to indicate it is a samsung phy > - Add property range and default value. > > Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 9 +++++++++ > 1 file changed, 9 insertions(+) > Reviewed-by: Rob Herring <robh@kernel.org>
diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt index 51376cbe5f3d..a5c5db6a0b2d 100644 --- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt @@ -100,6 +100,15 @@ 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 +- samsung,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. + The range is from 0x0 to 0x3, the default value is 0x1. + Details can refer to TXPREEMPAMPTUNE0 bits of USBNC_n_PHY_CFG1. +- samsung,picophy-dc-vol-level-adjust: HS DC Voltage Level Adjustment. + Adjust the high-speed transmitter DC level voltage. + The range is from 0x0 to 0xf, the default value is 0x3. + Details can refer to TXVREFTUNE0 bits of USBNC_n_PHY_CFG1. Example: