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From: Jonathan Cameron <jic23@kernel.org>
To: Rob Herring <robh+dt@kernel.org>
Cc: Stephen Boyd <swboyd@chromium.org>,
	Daniel Campello <campello@chromium.org>,
	LKML <devicetree@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Hartmut Knaack <knaack.h@gmx.de>,
	Lars-Peter Clausen <lars@metafoo.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Douglas Anderson <dianders@chromium.org>,
	"open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@vger.kernel.org>
Subject: Re: [PATCH v3 01/15] dt-bindings: iio: Add bindings for sx9310 sensor
Date: Thu, 6 Aug 2020 19:14:51 +0100
Message-ID: <20200806191451.3ce5ec57@archlinux> (raw)
In-Reply-To: <CAL_JsqLs99Q7o32mqZROQSLuaf-_6vVg_wSVbpMr0u3eD9LVEw@mail.gmail.com>

On Mon, 3 Aug 2020 20:01:06 -0600
Rob Herring <robh+dt@kernel.org> wrote:

> On Mon, Aug 3, 2020 at 1:00 PM Stephen Boyd <swboyd@chromium.org> wrote:
> >
> > Quoting Jonathan Cameron (2020-08-01 08:06:39)  
> > > On Fri, 31 Jul 2020 10:48:38 -0600
> > > Daniel Campello <campello@chromium.org> wrote:  
> > > > diff --git a/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml b/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml
> > > > new file mode 100644
> > > > index 00000000000000..5739074d3592fe
> > > > --- /dev/null
> > > > +++ b/Documentation/devicetree/bindings/iio/proximity/semtech,sx9310.yaml
> > > > @@ -0,0 +1,65 @@  
> > [...]  
> > > > +
> > > > +  "#io-channel-cells":
> > > > +    const: 1
> > > > +
> > > > +required:
> > > > +  - compatible
> > > > +  - reg
> > > > +  - "#io-channel-cells"  
> > >
> > > Missed this in earlier review (only noticed when I saw whilst santity
> > > checking earlier versions.
> > >
> > > Fairly sure we should only need #io-channel-cells if we have
> > > a consumer of a channel somewhere else in DT.  So it's not
> > > required as far as I can see.
> > >  
> >
> > This is mostly a decision for Rob to make, but I would make it required
> > because the device is always an io channel provider. It may be that it
> > isn't providing anything in the DT to something else in the DT but it is
> > providing this information somewhere so always having to spell that out
> > is simple and doesn't hurt.  
> 
> I agree. If the user is split in a board file or overlay, we don't
> want to have to be adding it to the provider at that time.

That is perhaps a reasonable view point for devices with channels that
are likely to be used by consumer drivers, but in this particular case we
are talking about a proximity sensor.  So far I don't think we
have any consumer drivers for this type of sensor (I might have forgotten
one of course!)

I'm not that fussed though, so will leave it in.

The argument is a lot stronger for ADCs and such like, so we can
start encouraging it for those.

Jonathan


> 
> Rob


  reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-31 16:48 [PATCH v3 00/15] sx9310 iio driver updates Daniel Campello
2020-07-31 16:48 ` [PATCH v3 01/15] dt-bindings: iio: Add bindings for sx9310 sensor Daniel Campello
2020-07-31 22:47   ` Rob Herring
2020-08-01 15:06   ` Jonathan Cameron
2020-08-03 19:00     ` Stephen Boyd
2020-08-04  2:01       ` Rob Herring
2020-08-06 18:14         ` Jonathan Cameron [this message]
2020-08-06 22:12           ` Rob Herring
2020-08-06 23:03             ` Stephen Boyd
2020-07-31 16:48 ` [PATCH v3 02/15] iio: sx9310: Update macros declarations Daniel Campello
2020-08-01 14:47   ` Jonathan Cameron
2020-07-31 16:48 ` [PATCH v3 03/15] iio: sx9310: Fix irq handling Daniel Campello
2020-07-31 18:03   ` Stephen Boyd
2020-07-31 18:35   ` Andy Shevchenko
2020-07-31 16:48 ` [PATCH v3 04/15] iio: sx9310: Remove acpi and of table macros Daniel Campello
2020-07-31 16:48 ` [PATCH v3 05/15] iio: sx9310: Change from .probe to .probe_new Daniel Campello
2020-07-31 16:48 ` [PATCH v3 06/15] iio: sx9310: Fixes various memory handling Daniel Campello
2020-07-31 19:24   ` Andy Shevchenko
2020-08-01 14:52     ` Jonathan Cameron
2020-07-31 16:48 ` [PATCH v3 07/15] iio: sx9310: Use long instead of int for channel bitmaps Daniel Campello
2020-07-31 18:38   ` Stephen Boyd
2020-07-31 16:48 ` [PATCH v3 08/15] iio: sx9310: Use regmap_read_poll_timeout() for compensation Daniel Campello
2020-07-31 18:39   ` Stephen Boyd
2020-07-31 16:48 ` [PATCH v3 09/15] iio: sx9310: Update copyright Daniel Campello
2020-07-31 16:48 ` [PATCH v3 10/15] iio: sx9310: Simplify error return handling Daniel Campello
2020-07-31 16:48 ` [PATCH v3 11/15] iio: sx9310: Use variable to hold &client->dev Daniel Campello
2020-07-31 16:48 ` [PATCH v3 12/15] iio: sx9310: Miscellaneous format fixes Daniel Campello
2020-07-31 16:48 ` [PATCH v3 13/15] iio: sx9310: Drop channel_users[] Daniel Campello
2020-07-31 16:48 ` [PATCH v3 14/15] iio: sx9310: Enable vdd and svdd regulators at probe Daniel Campello
2020-07-31 16:48 ` [PATCH v3 15/15] iio: sx9310: Use irq trigger flags from firmware Daniel Campello
2020-07-31 19:46   ` Andy Shevchenko
2020-08-01 15:01     ` Jonathan Cameron

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