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

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Message-ID: <Y1GEqa07/b25utui@sirena.org.uk>
Date:   Thu, 20 Oct 2022 18:26:01 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
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 08:03:37PM +0300, Andy Shevchenko wrote:
> On Thu, Oct 20, 2022 at 05:58:39PM +0100, Mark Brown wrote:

> > 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.

Most of the MFDs don't actually have multiple options for a given child
driver, and it's common where there are multiple options to either bind
with a different name representing the different child device or have
something that looks like a switch statement for the IDs which will
error out if it hits an ID that's not one the driver knows about (like
spi-pxa2xx-pci does with lpss_spi_setup()).

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