linux-kernel - Re: [PATCH] imx8mn-var-som: dts: fix PHY detection bug by adding deassert delay

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Message-ID: <CAOMZO5CQeeme6uhb8NCzR2QADjkBM-mRC9-GUnmhLWSGo5MMoQ@mail.gmail.com>
Date:   Thu, 27 Apr 2023 17:00:41 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] imx8mn-var-som: dts: fix PHY detection bug by adding
 deassert delay

Hi Hugo,

On Thu, Apr 27, 2023 at 4:56 PM Hugo Villeneuve <hugo@...ovil.com> wrote:
>
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
>
> While testing the ethernet interface on a symphony carrier
> board using an imx8mn SOM with an onboard PHY (EC hardware
> configuration), the ethernet PHY is not detected.
>
> The device tree in Variscite custom linux git repository uses the
> following property:
>
>     phy-reset-post-delay = <20>;
>
> Add a new property 'reset-deassert-us' of 20ms to have the same delay
> inside the ethphy handle.

Which Ethernet PHY does this board use?

What does its datasheet recommend?