linux-kernel - Re: [PATCH 2/2] eeprom: 93xx46: drop unneeded MODULE

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Date: Fri, 10 May 2024 17:28:24 +0300
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Miquel Raynal <miquel.raynal@...tlin.com>,
	Richard Weinberger <richard@....at>,
	Vignesh Raghavendra <vigneshr@...com>, linux-kernel@...r.kernel.org,
	linux-mtd@...ts.infradead.org
Subject: Re: [PATCH 2/2] eeprom: 93xx46: drop unneeded MODULE_ALIAS

On Wed, May 08, 2024 at 09:17:59PM +0200, Krzysztof Kozlowski wrote:
> 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.

I have done similar change in my patch series, after which I am 100% sure the
modalias can be removed. Can you look at that?

https://lore.kernel.org/r/20240508184905.2102633-1-andriy.shevchenko@linux.intel.com

> 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.

-- 
With Best Regards,
Andy Shevchenko