linux-kernel - Re: [PATCH v1] spi: fix client driver breakages when using GPIO descriptors

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Message-ID: <20201118114049.GA4827@sirena.org.uk>
Date:   Wed, 18 Nov 2020 11:40:49 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Grant Likely <grant.likely@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Sven Van Asbroeck <thesven73@...il.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Simon Han <z.han@...bus.com>, Lukas Wunner <lukas@...ner.de>,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] spi: fix client driver breakages when using GPIO
 descriptors

On Wed, Nov 18, 2020 at 02:03:41AM +0100, Linus Walleij wrote:
> On Mon, Nov 16, 2020 at 10:06 PM Mark Brown <broonie@...nel.org> wrote:

> > I think the main push in the other direction has always been people who
> > want to not have to write a driver at all and put absolutely everything
> > into DT which has scaling issues :/

> What I can't understand is what gave them that idea.

> This thing looks like a dream to these people for example:
> https://gist.github.com/Minecrell/56c2b20118ba00a9723f0785301bc5ec#file-dsi_panel_s6e88a0_ams452ef01_qhd_octa_video-dtsi
> And it looks like a nightmare to me.

> (There is even a tool to convert this description into a proper display
> driver now.)

> It just seems to be one of those golden hammer things: everything
> start to look like nails.

What people think they were sold was the idea that they shouldn't have
to write driver code or upstream things, something with more AML like
capabilities (not realising that AML works partly because ACPI hugely
constrains system design).

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