[PATCH 1/4] doc: dt-binding: ci-hdrc-usb2: add property for imx picophy
Shawn Guo
shawnguo at kernel.org
Mon Jul 13 04:31:30 EDT 2020
On Thu, Jul 09, 2020 at 06:58:59PM +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>
> ---
> 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
'picophy' should be documented in vendor-prefixes.yaml?
Shawn
> + 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:
>
> --
> 2.17.1
>
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