linux-kernel - Re: [PATCH v5 1/2] dt-bindings: regulator: add support for MT6392

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Message-ID: <20201026203608.GJ7402@sirena.org.uk>
Date:   Mon, 26 Oct 2020 20:36:08 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Fabien Parent <fparent@...libre.com>
Cc:     "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>, lgirdwood@...il.com,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH v5 1/2] dt-bindings: regulator: add support for MT6392

On Mon, Oct 26, 2020 at 07:38:14PM +0100, Fabien Parent wrote:
> On Mon, Oct 26, 2020 at 6:24 PM Mark Brown <broonie@...nel.org> wrote:

> > >         .name = "mt6392-regulator",
> > >         .of_compatible = "mediatek,mt6392-regulator"

> > This is still unneeded, it's just a reflection of Linux implementation
> > details and should be removed.   The MFD can just register the child
> > without supplying a compatible and things will continue to work just as
> > well.

> I'm not exactly sure how it is supposed to work. mfd_add_devices seems
> to register devices based on of_compatible or acpi_match from the
> mfd_cell. This platform does not have ACPI so I don't understand how

It should also support unconditionally registering devices, if it no
longer does so that's a regression in the framework which should be
fixed.  Looking at mfd_add_devices() I can't see an issue though, both
ACPI and DT information is optional - the entire DT section in
mfd_add_device() will be skipped if no of_compatible is specified in the
cell.  Are you *sure* that the regulator driver isn't running?

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