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

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Message-ID: <20200826204547.GU4965@sirena.org.uk>
Date:   Wed, 26 Aug 2020 21:45:47 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        kuldip dwivedi <kuldip.dwivedi@...esoftware.com>,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Qiang Zhao <qiang.zhao@....com>,
        Pankaj Bansal <pankaj.bansal@....com>,
        Varun Sethi <V.Sethi@....com>,
        tanveer <tanveer.alam@...esoftware.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH] spi: spi-fsl-dspi: Add ACPI support

On Wed, Aug 26, 2020 at 11:41:08PM +0300, Vladimir Oltean wrote:
> On Wed, Aug 26, 2020 at 10:34:04PM +0300, Andy Shevchenko wrote:

> > Theoretically you may declare your HID in the same / similar way as
> > PRP0001 and use same compatible strings and all other DT properties
> > (when they make sense and not duplicate ACPI functionality).
> > But better if ACPI people can tell you (I Cc'ed Rafael and ACPI
> > mailing list) if it is gonna work.

> Something doesn't look right about PRP0001, what's the catch?

Microsoft decided not to implement support for it in Windows, it's
essentially there for embedded style x86 platforms running Linux so they
don't need to reimplement so many wheels and can just reuse existing DT
bindings but it causes problems if you want to run Windows (and possibly
some of the enterprise Linux distros, I can't remember if any of them
had concerns about it) on the platform.

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