netdev - Re: [PATCH v2 3/3] ARM: dts: imx6qdl-sr-som: update phy configuration for som revision 1.9

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Date:   Thu, 21 Apr 2022 15:20:26 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Josua Mayer <josua@...id-run.com>, netdev@...r.kernel.org,
        alvaro.karsz@...id-run.com, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+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>,
        NXP Linux Team <linux-imx@....com>
Subject: Re: [PATCH v2 3/3] ARM: dts: imx6qdl-sr-som: update phy
 configuration for som revision 1.9

On Thu, Apr 21, 2022 at 03:30:38PM +0200, Andrew Lunn wrote:
> > The only other ways around this that I can see would be to have some
> > way to flag in DT that the PHYs are "optional" - if they're not found
> > while probing the hardware, then don't whinge about them. Or have
> > u-boot discover which address the PHY is located, and update the DT
> > blob passed to the kernel to disable the PHY addresses that aren't
> > present. Or edit the DT to update the node name and reg property. Or
> > something along those lines.
> 
> uboot sounds like the best option. I don't know if we currently
> support the status property for PHYs. Maybe the .dtsi file should have
> them all status = "disabled"; and uboot can flip the populated ones to
> "okay". Or maybe the other way around to handle older bootloaders.

... which would immediately regress the networking on all SolidRun iMX6
platforms when booting "new" DT with existing u-boot, so clearly that
isn't a possible solution.

-- 
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