linux-kernel - Re: [PATCH 1/2] dt-bindings: spi: renesas,sh-msiof: Add r8a7742 support

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Date:   Tue, 16 Jun 2020 12:03:45 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Magnus Damm <magnus.damm@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>
Subject: Re: [PATCH 1/2] dt-bindings: spi: renesas,sh-msiof: Add r8a7742
 support

On Thu, Jun 11, 2020 at 02:09:54PM +0200, Geert Uytterhoeven wrote:
> On Thu, Jun 11, 2020 at 10:50 AM Mark Brown <broonie@...nel.org> wrote:

> > I'm not sure it's a particular concern, especially since you'll be
> > sending this stuff in the same series as a bindings update and an extra
> > patch in a series makes very little difference.

> Until the DT bindings are split off into their own project...
> Listing unneeded compatible values in drivers also increases binary size.
> For RSPI and MSIOF that would be +2.5 KiB each.  Times tens of drivers.

> Considering the RSPI driver itself is only 9 KiB, and some RZ/A1 systems
> are really memory-constrained, I think it's better to avoid that.

That is an issue, though I can't help wondering if space constrained
systems could use some sort of automatic compaction of the ID tables
during install.  We're also bloating their DTs by adding fallbacks of
course!

> > > Nowadays we have "make dtbs_check", so if a DTS doesn't conform to the
> > > binding, it will be flagged.

> > For things that are upstream.

> The DT bindings apply to out-of-tree DTS files, too ;-)
> If they're not compliant, all odds are off.

The point here is to improve robustness and make the interface less
fragile.

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