linux-kernel - Re: [PATCH v3] arm64: dts: freescale: imx93-phycore-som: Delay the phy reset by a gpio

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Message-ID: <b2ea6b7f-3623-4486-82a0-cab97053a53e@gmx.net>
Date: Mon, 26 May 2025 08:44:36 +0200
From: Stefan Wahren <wahrenst@....net>
To: Andrew Lunn <andrew@...n.ch>, Christoph Stoidner <c.stoidner@...tec.de>
Cc: 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>, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, upstream@...ts.phytec.de
Subject: Re: [PATCH v3] arm64: dts: freescale: imx93-phycore-som: Delay the
 phy reset by a gpio

Hi Andrew,
hi Christoph

Am 24.05.25 um 19:44 schrieb Andrew Lunn:
>> diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
>> index 88c2657b50e6..b481097f08a4 100644
>> --- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
>> +++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
>> @@ -68,6 +68,8 @@ mdio: mdio {
>>   		ethphy1: ethernet-phy@1 {
>>   			compatible = "ethernet-phy-ieee802.3-c22";
>>   			reg = <1>;
>> +			reset-gpios = <&gpio4 23 GPIO_ACTIVE_HIGH>;
>> +			reset-assert-us = <30>;
> Is there anything in the datasheet about needing a delay after the
> reset? There is a DT property for this:
>
>    reset-deassert-us:
>      description:
>        Delay after the reset was deasserted in microseconds. If
>        this property is missing the delay will be skipped.
is it the time until the PHY finished its post reset stabilization 
(datasheet to call it T2 "reset to SMI ready")?
>
> Anyway:
>
> Reviewed-by: Andrew Lunn <andrew@...n.ch>
>
>      Andrew
>