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

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Date:   Thu, 27 Apr 2023 18:18:26 -0400
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Fabio Estevam <festevam@...il.com>, devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        linux-kernel@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] imx8mn-var-som: dts: fix PHY detection bug by adding
 deassert delay

On Thu, 27 Apr 2023 22:16:45 +0200
Ahmad Fatoum <a.fatoum@...gutronix.de> wrote:

> On 27.04.23 22:12, Hugo Villeneuve wrote:
> > On Thu, 27 Apr 2023 17:07:59 -0300
> > Fabio Estevam <festevam@...il.com> wrote:
> > 
> >> On Thu, Apr 27, 2023 at 5:06 PM Hugo Villeneuve <hugo@...ovil.com> wrote:
> >>
> >>> Hi Fabio,
> >>> it uses a ADIN1300 PHY.
> >>>
> >>> The datasheet indicate that the "Management interface active (t4)" state is reached at most 5ms after the reset signal is deasserted.
> >>
> >> Please add this information to the commit log and please add a Fixes: tag.
> > 
> > Good idea, will do.
> 
> Please also add the PHY name into the DT, e.g.:
> 
>   ethphy: ethernet-phy@4 { /* ADIN1300 */
> 
> I find this very useful when bringing up a new board and looking
> for similar DTs.
> 
> Thanks,
> Ahmad

Hi Ahmad,
altough I agree it is a good idea, I prefer to not add this information for now, because there is probably some (old) versions of this SOM which use other PHY devices (maybe AR8033), but I am not 100% sure as this is not clear from the SOM manufacturer infos/website.

Hugo.