Regression, bisected: meson-dwmac8b never loads, no ethernet

[Neil Armstrong]

Hi Geraldo,

Thanks for the report

On 21/09/2021 07:31, Martin Blumenstingl wrote:
> Hi Geraldo,
> 
> On Tue, Sep 21, 2021 at 4:09 AM Geraldo Nascimento
> <geraldogabriel at gmail.com> wrote:
>>
>> Sorry to add further noise to this, as there's still 6 release candidates to solve this regression, but the correct name of the driver is meson8b-dwmac.
>>
>> You see, git bisecting the kernel had my head spinning so much that I apparently switched the proper driver name.
>>
>> Speaking of which, I swear I ran git bisect every time telling it good when where's good and vice-versa. And was I left with a qcom general device tree commit that also merges qcom 5.14-rc3 into 5.15 because of a regression in USB apparently?
> Which board/SoC are you referring to?
> I can confirm that dwmac-meson8b still works fine on an Odroid-C1
> (Meson8b SoC) with 5.15-rc2
> Newer (arm64) SoCs additionally use an MDIO mux driver:
> - mdio-mux-mmioreg on GXL, GXM
> - mdio-mux-meson-g12a on G12A, G12B, SM1

Indeed it's an issue with mdio muxes, a similar issue had been reported by Marek at https://lore.kernel.org/all/0a2c4106-7f48-2bb5-048e-8c001a7c3fda@samsung.com/
and it concerns commit cf4b94c8530d ("of: property: fw_devlink: Add support for "phy-handle" property")

It may be the same issue here.

Neil

> 
> 
> Best regards,
> Martin
> 
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