linux-kernel - Re: [RFC] [media] imx: assume MEDIA_ENT_F_ATV

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Date:   Wed, 05 Apr 2017 11:43:47 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Steve Longerbeam <slongerbeam@...il.com>
Cc:     mark.rutland@....com, andrew-ct.chen@...iatek.com,
        minghsiu.tsai@...iatek.com, nick@...anahar.org,
        songjun.wu@...rochip.com, hverkuil@...all.nl,
        Steve Longerbeam <steve_longerbeam@...tor.com>, pavel@....cz,
        robert.jarzmik@...e.fr, devel@...verdev.osuosl.org,
        markus.heiser@...marIT.de,
        laurent.pinchart+renesas@...asonboard.com, shuah@...nel.org,
        linux@...linux.org.uk, geert@...ux-m68k.org,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        sakari.ailus@...ux.intel.com, arnd@...db.de, mchehab@...nel.org,
        bparrot@...com, robh+dt@...nel.org, horms+renesas@...ge.net.au,
        tiffany.lin@...iatek.com, linux-arm-kernel@...ts.infradead.org,
        niklas.soderlund+renesas@...natech.se, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, jean-christophe.trotin@...com,
        kernel@...gutronix.de, fabio.estevam@....com, shawnguo@...nel.org,
        sudipm.mukherjee@...il.com
Subject: Re: [RFC] [media] imx: assume MEDIA_ENT_F_ATV_DECODER entities
 output video on pad 1

On Tue, 2017-04-04 at 15:11 -0700, Steve Longerbeam wrote:
> 
> On 03/30/2017 10:25 AM, Philipp Zabel wrote:
> > The TVP5150 DT bindings specify a single output port (port 0) that
> > corresponds to the video output pad (pad 1, DEMOD_PAD_VID_OUT).
> >
> > Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
> > ---
> > I'm trying to get this to work with a TVP5150 analog TV decoder, and the
> > first problem is that this device doesn't have pad 0 as its single
> > output pad. Instead, as a MEDIA_ENT_F_ATV_DECODER entity, it has for
> > pads (input, video out, vbi out, audio out), and video out is pad 1,
> > whereas the device tree only defines a single port (0).
> 
> Shouldn't the DT bindings define ports for these other pads?

In this case, probably yes for the input pad, certainly no for the
VBI/audio pads. See the other mail.

> I haven't seen this documented anywhere, but shouldn't there
> be a 1:1 correspondence between DT ports and media pads?

Not in general. But imagine a dual HDMI->CSI2 converter, for example. We
don't support this yet, but that might reasonably be described in the
device tree as a single device with two output ports. But the internal
representation would be two completely separate v4l2 subdevices.

regards
Philipp