linux-kernel - Re: [PATCH] ARM: dts: imx6ul-tx6ul: Switch away from deprecated `phy-reset-gpios`

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Message-ID: <fa7e2cef-5242-4f3b-84ea-d77b959f6bdb@pengutronix.de>
Date: Wed, 3 Sep 2025 09:28:42 +0200
From: Ahmad Fatoum <a.fatoum@...gutronix.de>
To: Bence Csókás <csokas.bence@...lan.hu>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>
Cc: devicetree@...r.kernel.org, imx@...ts.linux.dev,
 Csaba Buday <buday.csaba@...lan.hu>, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM: dts: imx6ul-tx6ul: Switch away from deprecated
 `phy-reset-gpios`

Hello,

On 15.08.25 17:17, Bence Csókás wrote:
> The Ethernet PHY's reset GPIO should be specified in the node of the PHY
> itself, instead of the MAC (`fec`). The latter is deprecated, and was an
> i.MX-specific extension, incompatible with the new reset controller
> subsystem.

One reason to do it this way is that the PHY is in reset when the OS starts
and the external phy-reset-gpios allows MAC probe to get the PHY out of
reset, so it can be probed after reading its vendor/device IDs.

Does switching to this new binding address this scenario? If so, it should
be noted in the commit message.

> 
> Co-developed-by: Csaba Buday <buday.csaba@...lan.hu>
> Signed-off-by: Csaba Buday <buday.csaba@...lan.hu>
> Signed-off-by: Bence Csókás <csokas.bence@...lan.hu>
> ---
>  arch/arm/boot/dts/nxp/imx/imx6ul-tx6ul.dtsi | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/nxp/imx/imx6ul-tx6ul.dtsi b/arch/arm/boot/dts/nxp/imx/imx6ul-tx6ul.dtsi
> index f053358bc9317f8447d65013a18670cb470106b2..0a5e90704ea481b0716d6ff6bc6d2110914d4f31 100644
> --- a/arch/arm/boot/dts/nxp/imx/imx6ul-tx6ul.dtsi
> +++ b/arch/arm/boot/dts/nxp/imx/imx6ul-tx6ul.dtsi
> @@ -246,7 +246,6 @@ &fec1 {
>  	pinctrl-names = "default";
>  	pinctrl-0 = <&pinctrl_enet1 &pinctrl_enet1_mdio &pinctrl_etnphy0_rst>;
>  	phy-mode = "rmii";
> -	phy-reset-gpios = <&gpio5 6 GPIO_ACTIVE_LOW>;
>  	phy-supply = <&reg_3v3_etn>;
>  	phy-handle = <&etnphy0>;
>  	status = "okay";
> @@ -262,6 +261,13 @@ etnphy0: ethernet-phy@0 {
>  			pinctrl-0 = <&pinctrl_etnphy0_int>;
>  			interrupt-parent = <&gpio5>;
>  			interrupts = <5 IRQ_TYPE_EDGE_FALLING>;
> +			/* Reset SHOULD be a PHY property */

Comment belongs into commit message.

> +			reset-names = "phy";
> +			reset-gpios = <&gpio5 6 GPIO_ACTIVE_LOW>;
> +			reset-assert-us = <100>;
> +			reset-deassert-us = <25000>;
> +			/* Energy detect sometimes causes link failures */
> +			smsc,disable-energy-detect;

Unrelated change not described in the commit message.

Cheers,
Ahmad

>  			status = "okay";
>  		};
>  
> 
> ---
> base-commit: 0cc53520e68bea7fb80fdc6bdf8d226d1b6a98d9
> change-id: 20250815-b4-tx6ul-dt-phy-rst-7afc190a6907
> 
> Best regards,


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