linux-kernel - Re: [PATCH v11 1/2] dt-bindings: media: Add Allwinner V3s Camera Sensor Interface (CSI)

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Message-ID: <1568838.d8CnAYTeDB@avalon>
Date:   Wed, 26 Sep 2018 13:38:08 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     maxime.ripard@...tlin.com
Cc:     Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        "\"David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Jacob Chen <jacob-chen@...wrt.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Thierry Reding <treding@...dia.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Todor Tomov <todor.tomov@...aro.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v11 1/2] dt-bindings: media: Add Allwinner V3s Camera Sensor Interface (CSI)

Hi Maxime,

On Wednesday, 26 September 2018 13:35:47 EEST maxime.ripard@...tlin.com wrote:
> On Wed, Sep 26, 2018 at 01:19:34PM +0300, Laurent Pinchart wrote:
> > > +Endpoint node properties for CSI1
> > > +---------------------------------
> > 
> > Should you list the CSI0 properties as well ? As the driver in patch 2/2
> > doesn't support the CSI-2 interface I assume you have left out CSI0 for
> > now, but it should still be listed in the bindings. I'm fine with fixing
> > this as a follow-up patch to avoid missing the v4.20 merge window, but if
> > you end up resubmitting the series, could you please address the problem
> > ?
> 
> That driver is not available, and the documentation isn't either, so
> there's no easy way to tell which properties are going to be needed
> before doing the actual work of reverse engineering it and writing a
> driver for it. Unfortunately...

While DT bindings should be independent from driver implementations, I agree 
it's difficult to develop good bindings without hardware documentation and 
without at least one working driver implementation.

How about just explicitly stating that these bindings don't support CSI0 yet ?

-- 
Regards,

Laurent Pinchart