linux-kernel - Re: [PATCH v1 1/6] DT bindings: add bindings for ov965x camera module

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Date:   Mon, 26 Jun 2017 13:56:32 -0500
From:   Rob Herring <robh@...nel.org>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Hugues Fruchet <hugues.fruchet@...com>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>,
        Alexandre Torgue <alexandre.torgue@...com>,
        LKML <linux-kernel@...r.kernel.org>,
        Hans Verkuil <hverkuil@...all.nl>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Yannick Fertre <yannick.fertre@...com>,
        Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Guennadi Liakhovetski <g.liakhovetski@....de>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v1 1/6] DT bindings: add bindings for ov965x camera module

On Fri, Jun 23, 2017 at 12:25:33PM +0200, H. Nikolaus Schaller wrote:
> Hi Hugues,
> 
> > Am 22.06.2017 um 17:05 schrieb Hugues Fruchet <hugues.fruchet@...com>:
> > 
> > From: "H. Nikolaus Schaller" <hns@...delico.com>
> > 
> > This adds documentation of device tree bindings
> > for the OV965X family camera sensor module.
> > 
> > Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
> > Signed-off-by: Hugues Fruchet <hugues.fruchet@...com>
> > ---
> > .../devicetree/bindings/media/i2c/ov965x.txt       | 37 ++++++++++++++++++++++
> > 1 file changed, 37 insertions(+)
> > create mode 100644 Documentation/devicetree/bindings/media/i2c/ov965x.txt

[...]

> > +Optional Properties:
> > +- resetb-gpios: reference to the GPIO connected to the resetb pin, if any.
> > +- pwdn-gpios: reference to the GPIO connected to the pwdn pin, if any.
> 
> Here I wonder why you did split that up into two gpios. Each "*-gpios" can have
> multiple entries and if one is not used, a 0 can be specified to make it being ignored.
> 
> But it is up to DT maintainers what they prefer: separate single gpios or a single gpio array.

I think that is pretty clear if you survey a number of bindings (hint: 
it's the former).

Rob