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

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Message-Id: <5b29d981-aa8a-413e-8250-5fb33802f32d@app.fastmail.com>
Date: Wed, 08 May 2024 21:11:39 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Krzysztof Kozlowski" <krzk@...nel.org>,
 "Andy Shevchenko" <andriy.shevchenko@...el.com>
Cc: "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 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,


    Arnd