linux-kernel - Re: [PATCH net-next v4 11/12] microchip: lan865x: add driver support for Microchip's LAN865X MAC-PHY

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Date: Sat, 27 Apr 2024 21:22:23 +0100
From: Conor Dooley <conor@...nel.org>
To: Ramón Nordin Rodriguez <ramon.nordin.rodriguez@...roamp.se>
Cc: Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>,
	davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, horms@...nel.org, saeedm@...dia.com,
	anthony.l.nguyen@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, andrew@...n.ch, corbet@....net,
	linux-doc@...r.kernel.org, robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
	devicetree@...r.kernel.org, horatiu.vultur@...rochip.com,
	ruanjinjie@...wei.com, steen.hegelund@...rochip.com,
	vladimir.oltean@....com, UNGLinuxDriver@...rochip.com,
	Thorsten.Kummermehr@...rochip.com, Pier.Beruto@...emi.com,
	Selvamani.Rajagopal@...emi.com, Nicolas.Ferre@...rochip.com,
	benjamin.bigler@...nformulastudent.ch
Subject: Re: [PATCH net-next v4 11/12] microchip: lan865x: add driver support
 for Microchip's LAN865X MAC-PHY

On Sat, Apr 27, 2024 at 10:13:33PM +0200, Ramón Nordin Rodriguez wrote:
> On Sat, Apr 27, 2024 at 08:57:43PM +0100, Conor Dooley wrote:
> > >  static const struct of_device_id lan865x_dt_ids[] = {
> > > -       { .compatible = "microchip,lan8651", "microchip,lan8650" },
> > 
> > Huh, that's very strange. I don't see a single instance in the tree of a
> > of_device_id struct like this with two compatibles like this (at least
> > with a search of `rg "\.compatible.*\", \"" drivers/`.
> > 
> > Given the fallbacks in the binding, only "microchip,lan8650" actually
> > needs to be here.
> > 
> > > +       { .compatible = "microchip,lan865x", "microchip,lan8650" },
> > >         { /* Sentinel */ }
> > >  };
> > >  MODULE_DEVICE_TABLE(of, lan865x_dt_ids);
> > > 
> > > Along with compatible = "microchip,lan865x" in the dts
> > 
> > Just to be clear, the compatible w/ an x is unacceptable due to the
> > wildcard and the binding should stay as-is. Whatever probing bugs
> > the code has need to be resolved instead :)
> > 
> 
> All right, so when I change to
> 
> @@ -364,7 +364,7 @@ static void lan865x_remove(struct spi_device *spi)
>  }
> 
>  static const struct of_device_id lan865x_dt_ids[] = {
> -       { .compatible = "microchip,lan8651", "microchip,lan8650" },
> +       { .compatible = "microchip,lan8650" },
>         { /* Sentinel */ }
>  };
>  MODULE_DEVICE_TABLE(of, lan865x_dt_ids);
> 
> I still get the output
> [    0.124266] SPI driver lan865x has no spi_device_id for microchip,lan8650
> But the driver does probe and I get a network interface.
> 
> If no one beats me to it I'll single step the probe tomorrow.

I think the error pretty much is what it says it is, the driver doesn't
appear to have a spi_device_id table containing lan8650. The name of
the driver is lan685x which is used in the fallback clause in
__spi_register_driver(), so it complains as it does not find lan8650 in
either. If my understanding is correct, either a spi_device_id table is
required or the driver needs a rename with s/x/0/.

Cheers,
Conor.

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