linux-kernel - Re: [PATCH 1/2] dt-bindings: mfd: Add ChromeOS fingerprint binding

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Date:   Tue, 15 Mar 2022 15:48:08 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Benson Leung <bleung@...omium.org>,
        linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Guenter Roeck <groeck@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Craig Hesling <hesling@...omium.org>,
        Tom Hughes <tomhughes@...omium.org>,
        Alexandru M Stan <amstan@...omium.org>
Subject: Re: [PATCH 1/2] dt-bindings: mfd: Add ChromeOS fingerprint binding

On Tue, 15 Mar 2022, Stephen Boyd wrote:

> Quoting Lee Jones (2022-03-15 04:30:49)
> > On Tue, 15 Mar 2022, Krzysztof Kozlowski wrote:
> >
> > > On 15/03/2022 12:10, Lee Jones wrote:
> > > > On Tue, 15 Mar 2022, Krzysztof Kozlowski wrote:
> > > >
> > > >> On 15/03/2022 00:22, Stephen Boyd wrote:
> > > >>> Add a binding to describe the fingerprint processor found on Chromeboks
> > > >>> with a fingerprint sensor.
> > > >>>
> > > >>> Cc: Rob Herring <robh+dt@...nel.org>
> > > >>> Cc: <devicetree@...r.kernel.org>
> > > >>> Cc: Guenter Roeck <groeck@...omium.org>
> > > >>> Cc: Douglas Anderson <dianders@...omium.org>
> > > >>> Cc: Craig Hesling <hesling@...omium.org>
> > > >>> Cc: Tom Hughes <tomhughes@...omium.org>
> > > >>> Cc: Alexandru M Stan <amstan@...omium.org>
> > > >>> Signed-off-by: Stephen Boyd <swboyd@...omium.org>
> > > >>> ---
> > > >>>  .../bindings/mfd/google,cros-ec-fp.yaml       | 89 +++++++++++++++++++
> > > >>>  1 file changed, 89 insertions(+)
> > > >>>  create mode 100644 Documentation/devicetree/bindings/mfd/google,cros-ec-fp.yaml
> > > >>>
> > > >>> diff --git a/Documentation/devicetree/bindings/mfd/google,cros-ec-fp.yaml b/Documentation/devicetree/bindings/mfd/google,cros-ec-fp.yaml
> > > >>> new file mode 100644
> > > >>> index 000000000000..05d2b2b9b713
> > > >>> --- /dev/null
> > > >>> +++ b/Documentation/devicetree/bindings/mfd/google,cros-ec-fp.yaml
> > > >>> @@ -0,0 +1,89 @@
> > > >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > >>> +%YAML 1.2
> > > >>> +---
> > > >>> +$id: http://devicetree.org/schemas/mfd/google,cros-ec-fp.yaml#
> > > >>
> > > >> Why is this in the MFD directory? Is it really a Multi Function Device?
> > > >> Description is rather opposite. You also did not CC MFD maintainer.
> > > >
> > > > A lot of the ChromeOS Embedded Controller support used to be located
> > > > in MFD.  There are still remnants, but most was moved to
> > > > drivers/platform IIRC.
> > > >
> > > > Please see: drivers/mfd/cros_ec_dev.c
> > >
> > > Yes, I know, that part is a MFD. But why the fingerprint controller part
> > > is MFD? To me it is closer to input device.
> >
> > It's tough to say from what I was sent above.
> >
> > But yes, sounds like it.
> >
> > We do not want any device 'functionality' in MFD ideally.
> >
> 
> I put it next to the existing cros-ec binding. The existing binding is
> there because of historical reasons as far as I know. Otherwise it
> didn't seem MFD related so I didn't Cc mfd maintainer/list. New file
> additions don't usually conflict with anything and this is in the
> bindings directory so the driver side maintainer would be picking up the
> binding.

That's not how it works unfortunately.

This file is located in the MFD bindings directory, so I would be
picking it up (if it ends up staying here).

Best to rely on `get_maintainer.pl` for this:

$ ./scripts/get_maintainer.pl -f Documentation/devicetree/bindings/mfd/
Lee Jones <lee.jones@...aro.org> (supporter:MULTIFUNCTION DEVICES (MFD))
Rob Herring <robh+dt@...nel.org> (maintainer:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS)
devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS)
linux-kernel@...r.kernel.org (open list)

-- 
Lee Jones [李琼斯]
Principal Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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