[PATCH v2 1/4] doc: dt-binding: ci-hdrc-usb2: add property for imx picophy
Rob Herring
robh at kernel.org
Thu Jul 23 13:35:25 EDT 2020
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 at nxp.com>
> Signed-off-by: Peter Chen <peter.chen at 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
>
More information about the linux-arm-kernel
mailing list