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Date: Wed, 8 May 2024 21:17:59 +0200
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Subject: Re: [PATCH 2/2] eeprom: 93xx46: drop unneeded MODULE_ALIAS
To: Arnd Bergmann <arnd@arndb.de>,
 Andy Shevchenko <andriy.shevchenko@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 Miquel Raynal <miquel.raynal@bootlin.com>,
 Richard Weinberger <richard@nod.at>, Vignesh Raghavendra <vigneshr@ti.com>,
 linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org
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From: Krzysztof Kozlowski <krzk@kernel.org>
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On 08/05/2024 21:11, Arnd Bergmann wrote:
> On Wed, May 8, 2024, at 20:44, Krzysztof Kozlowski wrote:
>> On 08/05/2024 20:28, Andy Shevchenko wrote:
>>> On Wed, May 08, 2024 at 08:15:00PM +0200, Krzysztof Kozlowski wrote:
>>>> On 08/05/2024 19:53, Andy Shevchenko wrote:
>>>>> On Sun, Apr 14, 2024 at 05:49:57PM +0200, Krzysztof Kozlowski wrote:
>>>>>> The ID table already has respective entry and MODULE_DEVICE_TABLE and
>>>>>> creates proper alias for SPI driver.  Having another MODULE_ALIAS causes
>>>>>> the alias to be duplicated.
>>>
>>> ...
>>>
>>>>>>  MODULE_ALIAS("spi:93xx46");
>>>>>
>>>>> I was stumbled over this (leftover?).
>>>>> Commit message doesn't elaborate this bit.
>>>>> Any comments?
>>>>
>>>> It is not present in ID table and commit msg removes only duplicated
>>>> aliases. That alias has meaning - someone might be actually relying on it.
>>>
>>> It seems no users for it. The only user of platform data of this EEPROM uses
>>> board files which AFAIU bypasses modalias matching.
>>
>> I don't think that's correct. The modalias of SPI board is there on
>> purpose. 
> 
> Right, but I think a better workaround would have been to change
> the board_info to pick a modalias that is part of the ID table:
> 
> --- a/drivers/misc/eeprom/digsy_mtc_eeprom.c
> +++ b/drivers/misc/eeprom/digsy_mtc_eeprom.c
> @@ -76,7 +76,7 @@ static struct gpiod_lookup_table eeprom_spi_gpiod_table = {
>  
>  static struct spi_board_info digsy_mtc_eeprom_info[] __initdata = {
>         {
> -               .modalias               = "93xx46",
> +               .modalias               = "eeprom-93xx46",
>                 .max_speed_hz           = 1000000,
>                 .bus_num                = EE_SPI_BUS_NUM,
>                 .chip_select            = 0,
> 

That's kind of independent change. This commit *only* removed duplicated
aliases, thus should have not functional impact except dropping
redundant code. What you propose is to change spi board matching, which
is reasonable, just a different thing.

Best regards,
Krzysztof