linux-kernel - Re: [PATCH 1/3] Documentation: dtb: xgene: Add hwmon dts binding documentation

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Date:	Wed, 25 May 2016 12:09:12 -0500
From:	Rob Herring <robh@...nel.org>
To:	Hoan Tran <hotran@....com>
Cc:	Jean Delvare <jdelvare@...e.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jonathan Corbet <corbet@....net>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Duc Dang <dhdang@....com>, Loc Ho <lho@....com>,
	linux-hwmon@...r.kernel.org, linux-doc@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] Documentation: dtb: xgene: Add hwmon dts binding
 documentation

On Mon, May 23, 2016 at 06:01:14PM -0700, Hoan Tran wrote:
> Hi Rob,
> 
> Thanks for your review !
> 
> On Mon, May 23, 2016 at 1:30 PM, Rob Herring <robh@...nel.org> wrote:
> >
> > On Mon, May 16, 2016 at 09:17:25AM -0700, Hoan Tran wrote:
> > > This patch adds the APM X-Gene hwmon device tree node documentation.
> > >
> > > Signed-off-by: Hoan Tran <hotran@....com>
> > > ---
> > >  .../devicetree/bindings/hwmon/apm-xgene-hwmon.txt          | 14 ++++++++++++++
> > >  1 file changed, 14 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/hwmon/apm-xgene-hwmon.txt
> > >
> > > diff --git a/Documentation/devicetree/bindings/hwmon/apm-xgene-hwmon.txt b/Documentation/devicetree/bindings/hwmon/apm-xgene-hwmon.txt
> > > new file mode 100644
> > > index 0000000..49a482e
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/hwmon/apm-xgene-hwmon.txt
> > > @@ -0,0 +1,14 @@
> > > +APM X-Gene hwmon driver
> > > +
> > > +Hwmon driver accesses sensors over the "SLIMpro" mailbox.
> >
> > DT bindings describe h/w, not driver data.
> How about this description: "APM X-Gene SOC sensors are accessed over
> the "SLIMpro" mailbox" ?
> > I'm not sure this belongs in
> > DT and perhaps the devices for the mailbox should be created by the
> > mailbox driver.
> I don't think the current mailbox supports it.

Then add it. The mailbox binding is really only needed when other h/w 
blocks use a mailbox. As this is purely a firmware interface then the 
mailbox driver can create any devices it needs. The devices don't have 
to be in DT to be created.

Rob