[PATCH] arm64: dts: imx95: add some USB3 PHY tuning properties

[Shawn Guo]

On Fri, Jun 27, 2025 at 11:13:48AM +0800, Xu Yang wrote:
> Add some USB3 PHY tuning properties to imx95-15x15-evk and
> imx95-19x19-evk boards to improve USB signal quality.
> 
> Reviewed-by: Jun Li <jun.li at nxp.com>
> Signed-off-by: Xu Yang <xu.yang_2 at nxp.com>
> ---
>  arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts | 6 +++++-
>  arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts | 4 ++++
>  2 files changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts b/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts
> index 6c47f4b47356..b26e9db7832a 100644
> --- a/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx95-15x15-evk.dts
> @@ -1069,8 +1069,12 @@ usb3_data_hs: endpoint {
>  };
>  
>  &usb3_phy {
> -	orientation-switch;
> +	fsl,phy-pcs-tx-deemph-3p5db-attenuation-db = <17>;
> +	fsl,phy-pcs-tx-swing-full-percent = <100>;
>  	fsl,phy-tx-preemp-amp-tune-microamp = <600>;
> +	fsl,phy-tx-vboost-level-microvolt = <1156>;
> +	fsl,phy-tx-vref-tune-percent = <100>;
> +	orientation-switch;
>  	status = "okay";

It conflicts with what I applied from Frank [1].

Shawn

[1] https://lkml.org/lkml/2025/6/6/920

>  
>  	port {
> diff --git a/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts b/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
> index 6886ea766655..e212f12f869a 100644
> --- a/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
> @@ -514,7 +514,11 @@ usb3_data_hs: endpoint {
>  };
>  
>  &usb3_phy {
> +	fsl,phy-pcs-tx-deemph-3p5db-attenuation-db = <17>;
> +	fsl,phy-pcs-tx-swing-full-percent = <100>;
>  	fsl,phy-tx-preemp-amp-tune-microamp = <600>;
> +	fsl,phy-tx-vboost-level-microvolt = <1156>;
> +	fsl,phy-tx-vref-tune-percent = <100>;
>  	orientation-switch;
>  	status = "okay";
>  
> -- 
> 2.34.1
>