linux-kernel - Re: [PATCH 1/3] arm64: dts: imx95-19x19-evk: fix the overshoot issue of NETC

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Message-ID: <aDcmuyWySD3QNUaz@lizhi-Precision-Tower-5810>
Date: Wed, 28 May 2025 11:07:39 -0400
From: Frank Li <Frank.li@....com>
To: Wei Fang <wei.fang@....com>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
	festevam@...il.com, devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] arm64: dts: imx95-19x19-evk: fix the overshoot issue
 of NETC

On Wed, May 28, 2025 at 04:34:31PM +0800, Wei Fang wrote:
> The overshoot of MDIO, MDC and ENET1_TDx is too high, so reduce the drive
> strength these pins.
>
> Fixes: 025cf78938c2 ("arm64: dts: imx95-19x19-evk: add ENETC 0 support")
> Signed-off-by: Wei Fang <wei.fang@....com>

Reviewed-by: Frank Li <Frank.Li@....com>

> ---
>  arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts b/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
> index 6886ea766655..d7d845231312 100644
> --- a/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx95-19x19-evk.dts
> @@ -566,17 +566,17 @@ &wdog3 {
>  &scmi_iomuxc {
>  	pinctrl_emdio: emdiogrp{
>  		fsl,pins = <
> -			IMX95_PAD_ENET1_MDC__NETCMIX_TOP_NETC_MDC		0x57e
> -			IMX95_PAD_ENET1_MDIO__NETCMIX_TOP_NETC_MDIO		0x97e
> +			IMX95_PAD_ENET1_MDC__NETCMIX_TOP_NETC_MDC		0x50e
> +			IMX95_PAD_ENET1_MDIO__NETCMIX_TOP_NETC_MDIO		0x90e
>  		>;
>  	};
>
>  	pinctrl_enetc0: enetc0grp {
>  		fsl,pins = <
> -			IMX95_PAD_ENET1_TD3__NETCMIX_TOP_ETH0_RGMII_TD3		0x57e
> -			IMX95_PAD_ENET1_TD2__NETCMIX_TOP_ETH0_RGMII_TD2		0x57e
> -			IMX95_PAD_ENET1_TD1__NETCMIX_TOP_ETH0_RGMII_TD1		0x57e
> -			IMX95_PAD_ENET1_TD0__NETCMIX_TOP_ETH0_RGMII_TD0		0x57e
> +			IMX95_PAD_ENET1_TD3__NETCMIX_TOP_ETH0_RGMII_TD3		0x50e
> +			IMX95_PAD_ENET1_TD2__NETCMIX_TOP_ETH0_RGMII_TD2		0x50e
> +			IMX95_PAD_ENET1_TD1__NETCMIX_TOP_ETH0_RGMII_TD1		0x50e
> +			IMX95_PAD_ENET1_TD0__NETCMIX_TOP_ETH0_RGMII_TD0		0x50e
>  			IMX95_PAD_ENET1_TX_CTL__NETCMIX_TOP_ETH0_RGMII_TX_CTL	0x57e
>  			IMX95_PAD_ENET1_TXC__NETCMIX_TOP_ETH0_RGMII_TX_CLK	0x58e
>  			IMX95_PAD_ENET1_RX_CTL__NETCMIX_TOP_ETH0_RGMII_RX_CTL	0x57e
> --
> 2.34.1
>