linux-kernel - Re: [PATCH v1 3/6] spi: pxa2xx: Remove no more needed PCI ID table

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Message-ID: <Y1F/aVEYn3GIVEN2@smile.fi.intel.com>
Date:   Thu, 20 Oct 2022 20:03:37 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>
Subject: Re: [PATCH v1 3/6] spi: pxa2xx: Remove no more needed PCI ID table

On Thu, Oct 20, 2022 at 05:58:39PM +0100, Mark Brown wrote:
> On Thu, Oct 20, 2022 at 07:42:09PM +0300, Andy Shevchenko wrote:
> > On Thu, Oct 20, 2022 at 05:25:15PM +0100, Mark Brown wrote:
> 
> > > That's true currently since you're matching based on ACPI ID and then
> > > have the lookup done with the ID information in the acpi_device_id table
> > > but IIRC the patch was replacing that with some device property stuff.
> 
> > But that one also based on the IDs, it's not assigned without real IDs of
> > the devices on the certain platforms. I don't see how it's different in
> > this sense.
> 
> The driver won't even match and therefore load if it doesn't have a
> lookup for the device with the current code, the type code comes from
> the match.  If it has to go querying a device property then the driver
> can load but end up with a device property it hasn't ever heard of and
> end up misbehaving as a result.

That's how all MFD devices work nowadays, right? What's so special about
this driver? It's being used as a child by MFD. If what you are telling
is a real concern, we have to have a way to assure that all drivers that
are children of the MFDs should provide a match. IIRC there is no such
mechanism exists in the kernel these days.

-- 
With Best Regards,
Andy Shevchenko