linux-kernel - Re: [RFC 1/5] media: dt-bindings: Document 'location' property

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Message-ID: <20190902081125.GD15850@amd>
Date:   Mon, 2 Sep 2019 10:11:25 +0200
From:   Pavel Machek <pavel@....cz>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:MEDIA INPUT INFRASTRUCTURE (V4L/DVB)" 
        <linux-media@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        devicetree@...r.kernel.org
Subject: Re: [RFC 1/5] media: dt-bindings: Document 'location' property

On Mon 2019-09-02 11:02:11, Laurent Pinchart wrote:
> Hi Pavel,
> 
> On Sun, Sep 01, 2019 at 07:24:15PM +0200, Pavel Machek wrote:
> > > > +++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
> > > > @@ -89,6 +89,10 @@ Optional properties
> > > >    but a number of degrees counter clockwise. Typical values are 0 and 180
> > > >    (upside down).
> > > > 
> > > > +- location: The camera device mounting position, relative to the device
> > > > +  usage orientation. Possible values are:
> > > > +  0 - Front camera. The image sensor is mounted on the front side of the device.
> > > > +  1 - Back camera. The image sensor is mounted on the back side of the device.
> > > 
> > > Would it make sense to make this a little more generic? Such as s/image
> > > sensor/ device/, for instance?
> > > 
> > > Is this also relevant for flash or lens devices?
> > > 
> > > Flash (torch) devices could be present, at least principle, without a
> > > camera. There once was even such a Nokia phone, 1100 unless I'm mistaken.
> > > :-)
> > 
> > Well, I'd call them LEDs, not camera flashes ... if there's no camera. And IIRC 
> > these devices had LEDs on top of the phone... so neither front nor back side.
> 
> I would go for the name "torch" in that case. It really depends on the
> device, but in any case, the torch LEDs would have a location (and we
> would possibly need to expand this property to
> include the top, bottom, left and right sides).

Yes, but please let the torch devices be handled by LED subsystem
(/sys/class/leds). media/ subsystem is a bit too big and complex for
toggling LEDs on and off...

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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