linux-kernel - Re: [PATCH] mmc: mmc_spi: add spi:mmc-spi-slot alias

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Date:   Thu, 22 Jul 2021 13:28:43 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Andreas Schwab <schwab@...e.de>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Tobias Schramm <t.schramm@...jaro.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: mmc_spi: add spi:mmc-spi-slot alias

On Thu, Jul 22, 2021 at 1:03 PM Andreas Schwab <schwab@...e.de> wrote:
> On Jul 21 2021, Andy Shevchenko wrote:
>
> > Or problem is somewhere else?
>
> I don't know.  Why does the spi subsystem put "spi:mmc-spi-slot" into
> the modalias file, instead of "of:N(null)T(null)Cmmc-spi-slot" or
> similar?  The same problem exists with the other spi port on the board,
> which has a jedec,spi-nor instance attached, also not auto loading.

You see, there are two unrelated drivers that share the same issue
(the common denominator is that they are SPI devices). I believe the
issue is somewhere in the SPI core rather than here.

Compare the code of
https://elixir.bootlin.com/linux/latest/source/drivers/i2c/i2c-core-base.c#L649
vs.
https://elixir.bootlin.com/linux/latest/source/drivers/spi/spi.c#L56

and

https://elixir.bootlin.com/linux/latest/source/drivers/i2c/i2c-core-base.c#L139
vs.
https://elixir.bootlin.com/linux/latest/source/drivers/spi/spi.c#L361

The culprit is this one:
https://lore.kernel.org/lkml/20190618052644.32446-1-bjorn.andersson@linaro.org/

and in my humble opinion must be reverted.

-- 
With Best Regards,
Andy Shevchenko