linux-kernel - Re: [PATCH 1/2] firmware: include drivers/firmware/Kconfig unconditionally

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Date:   Tue, 28 Sep 2021 10:51:36 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        "James E.J. Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-ia64@...r.kernel.org,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH 1/2] firmware: include drivers/firmware/Kconfig unconditionally

On Tue, Sep 28, 2021 at 10:37 AM Charles Keepax
<ckeepax@...nsource.cirrus.com> wrote:
>
> Thanks for looking at this for us. I don't think we are greatly
> attached to drivers/firmware as a location. Essentially, what we
> have is some firmware parsing code that needs to be shared across
> several devices, previously this was just in the sound subsystem as
> all our parts were audio. We are going to shortly be upstreaming
> some non-audio parts that use the same firmware infrastructure
> and it didn't seem very sensible to have them including bits of
> the audio subsystem.
>
> I guess the question might be where else would said code go?
> drivers/firmware seemed most obvious, all the other locations
> I can think of don't really make sense. Can't really put it a bus
> like spi/i2c etc. because we have parts on many buses. Can't
> really put it in a functional subsystem (audio/input etc.) since
> the whole idea was to try and get some independence from that so
> we don't have parts including subsystems they don't use. Could
> maybe put it in MFD, but no hard guarantee every part using it
> will be an MFD device and I am fairly confident Lee will feel it
> isn't MFD code as it doesn't relate to managing multiple devices.
> Only other option I can think of would be to make some sort of
> drivers/dsp or maybe drivers/cs_dsp, but not clear to me that is
> obviously better than using drivers/firmware.

Other DSPs use the drivers/remoteproc/ subsystem, but that
is more for general-purpose DSPs that can load application
specific firmware rather than loading a single firmware blob
as you'd normally do with the request_firmware() style interface.

Not sure if that fits what you do. Can you point to a high-level
description of what this DSP does besides audio, and how
flexible it is? That might help find the right place for this.

       Arnd