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: Mon, 29 Apr 2024 09:47:34 +0000
From: <Parthiban.Veerasooran@...rochip.com>
To: <conor@...nel.org>, <ramon.nordin.rodriguez@...roamp.se>, <andrew@...n.ch>
CC: <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

Hi All,

On 28/04/24 1:27 am, Conor Dooley wrote:
> On Sat, Apr 27, 2024 at 09:19:34PM +0200, Ramón Nordin Rodriguez wrote:
>> Hi,
>>
>> For me the mac driver fails to probe with the following log
>> [    0.123325] SPI driver lan865x has no spi_device_id for microchip,lan8651
>>
>> With this change the driver probes
>>
>> diff --git a/drivers/net/ethernet/microchip/lan865x/lan865x.c b/drivers/net/ethernet/microchip/lan865x/lan865x.c
>> index 9abefa8b9d9f..72a663f14f50 100644
>> --- a/drivers/net/ethernet/microchip/lan865x/lan865x.c
>> +++ b/drivers/net/ethernet/microchip/lan865x/lan865x.c
>> @@ -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" },
> 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 🙂
> 
Looks like, the below changes needed to work correctly,

lan865x.c:
- compatible string to be changed like below as it is a fallback for all 
variants,
	.compatible = "microchip,lan8650"
- DRV_NAME to be changed like below,
	#define DRV_NAME                        "lan8650"

microchip,lan865x.example.dts for lan8650:
- compatible string to be changed like below,
	.compatible = "microchip,lan8650";
	OR
microchip,lan865x.example.dts for lan8651:
- compatible string to be changed like below,
	compatible = "microchip,lan8651", "microchip,lan8650";

I tested with the above changes and there was no issues observed. Any 
comments on this? Otherwise we can stick with these changes for the next 
version.

Best regards,
Parthiban V

> Thanks,
> Conor.