linux-kernel - Re: [PATCH V2 1/2] arm64: dts: imx8mm-evk: add phy-reset-gpios for fec1

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Message-ID: <VI1PR04MB70239911C3C71E0503808F85EE630@VI1PR04MB7023.eurprd04.prod.outlook.com>
Date:   Thu, 31 Oct 2019 18:59:51 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     Peng Fan <peng.fan@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        Anson Huang <anson.huang@....com>,
        Daniel Baluta <daniel.baluta@....com>,
        Jacky Bai <ping.bai@....com>, Jun Li <jun.li@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andy Duan <fugang.duan@....com>
Subject: Re: [PATCH V2 1/2] arm64: dts: imx8mm-evk: add phy-reset-gpios for
 fec1

On 21.10.2019 13:19, Peng Fan wrote:
> From: Peng Fan <peng.fan@....com>
> 
> We should not rely on bootloader to configure the phy reset.
> So introduce phy-reset-gpios property to let Linux handle phy reset
> itself.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> Reviewed-by: Marco Felsch <m.felsch@...gutronix.de>

This broke NFS boot for me in next-20191031: board now hangs on DHCP.

It can be fixed by reverting this DT patch or by setting 
CONFIG_AT803X_PHY to y instead of m.

Needing a phy module is not a bug but everybody will need to either 
adjust .config or build modules into an initramfs somehow.

> ---
> 
> V2:
>   U-Boot->bootloader
>   Add R-b tag
> 
>   arch/arm64/boot/dts/freescale/imx8mm-evk.dts | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> index faefb7182af1..e4d66f7db09d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dts
> @@ -80,6 +80,7 @@
>   	pinctrl-0 = <&pinctrl_fec1>;
>   	phy-mode = "rgmii-id";
>   	phy-handle = <&ethphy0>;
> +	phy-reset-gpios = <&gpio4 22 GPIO_ACTIVE_LOW>;
>   	fsl,magic-packet;
>   	status = "okay";