linux-kernel - Re: [PATCH] spi: spi-fsl-dspi: Add ACPI support

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Message-ID: <20200826184253.GQ4965@sirena.org.uk>
Date:   Wed, 26 Aug 2020 19:42:53 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Qiang Zhao <qiang.zhao@....com>,
        kuldip dwivedi <kuldip.dwivedi@...esoftware.com>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Pankaj Bansal <pankaj.bansal@....com>,
        Varun Sethi <V.Sethi@....com>,
        Tanveer Alam <tanveer.alam@...esoftware.com>
Subject: Re: [PATCH] spi: spi-fsl-dspi: Add ACPI support

On Wed, Aug 26, 2020 at 09:33:38PM +0300, Vladimir Oltean wrote:
> On Wed, Aug 26, 2020 at 05:55:52PM +0100, Mark Brown wrote:
> > > On Wed, Aug 26, 2020 at 03:23:12PM +0100, Mark Brown wrote:

> > > Showing my ignorance here, but is there something equivalent to
> > > of_machine_is_compatible() for ACPI?

> > The NXP0005 is the ACPI equivalent of a compatible (comprehensibility is
> > not ACPI's forte) and they're tying driver data to it there.

> Where I was trying to get here is that we could have a single _HID for
> the DSPI controller, and corroborate that with the ACPI equivalent of
> of_machine_is_compatible("fsl,ls2085a") at driver probe time before
> assigning the driver data.

Oh, there isn't an ACPI equivalent of that.  DMI information doesn't
capture anything useful about the chipset, only the system as a whole
(assuming it's usefully filled).  See for example

    sound/soc/intel/common/soc-intel-quirks.h

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