From: Marco Felsch <m.felsch@pengutronix.de>
To: Jacopo Mondi <jacopo@jmondi.org>
Cc: mark.rutland@arm.com, devicetree@vger.kernel.org,
Ian Arkver <ian.arkver.dev@gmail.com>,
robh+dt@kernel.org, hans.verkuil@cisco.com,
Sakari Ailus <sakari.ailus@linux.intel.com>,
mchehab@kernel.org, graphics@pengutronix.de,
linux-media@vger.kernel.org
Subject: Re: [PATCH 1/3] media: dt-bindings: add bindings for Toshiba TC358746
Date: Tue, 16 Apr 2019 12:45:50 +0200 [thread overview]
Message-ID: <20190416104550.htexnpzgypuuubo4@pengutronix.de> (raw)
In-Reply-To: <20190305181419.kqdaqnjte3v7663f@pengutronix.de>
Hi Rob,
gentle ping.
Regards,
Marco
On 19-03-05 19:14, Marco Felsch wrote:
> Hi Rob,
>
> I think you didn't followed the discussion in detail so I will ask you
> personal. In short the tc358746 can act as parallel-in -> csi-out or as
> csi->in -> parallel-out device. The phyiscal pins are always the same
> only the internal timings are different. So we have two ports with two
> endpoints.
>
> Now the question is how we determine the mode. We have two approaches:
> 1)
> port@0 -> input port
> port@1 -> output port
>
> pro:
> + no extra vendor specific binding is needed to determine the mode
>
> con:
> - input/output endpoint can be parallel or mipi-csi2.
>
> 2)
> port@0 -> parallel port
> port@1 -> mipi-csi2 port
>
> pro:
> + input/output endpoint are fixed to parallel or mipi
>
> con:
> - vendor specific binding is needed to determine the mode
>
> Thanks for your comments :)
>
> Regards,
> Marco
>
> On 19-03-05 09:49, Jacopo Mondi wrote:
> > Hi Sakari, Marco,
> >
> > On Mon, Mar 04, 2019 at 08:17:48PM +0200, Sakari Ailus wrote:
> > > Hi Marco,
> > >
> > > On Mon, Mar 04, 2019 at 05:55:28PM +0100, Marco Felsch wrote:
> > > > > > (more device specific)
> > > > > > tc358746,default-mode = <CSI-Tx> /* Parallel-in -> CSI-out */
> > > > > > tc358746,default-mode = <CSI-Rx> /* CSI-in -> Parallel-out */
> > > > > >
> > > > > > or
> > > > > >
> > > > > > (more generic)
> > > > > > tc358746,default-dir = <PARALLEL_TO_CSI2>
> > > > > > tc358746,default-dir = <CSI2_TO_PARALLEL>
> > > > >
> > > > > The prefix for Toshiba is "toshiba". What would you think of
> > > > > "toshiba,csi2-direction" with values of either "rx" or "tx"? Or
> > > > > "toshiba,csi2-mode" with either "master" or "slave", which would be a
> > > > > little bit more generic, but could be slightly more probable to get wrong
> > > > > as well.
> > > >
> > > > You're right mixed the prefix with the device.. If we need to introduce
> > > > a property I would prefer the "toshiba,csi2-direction" one. I said if
> > > > because as Jacopo mentioned we can avoid the property by define port@0
> > > > as input and port@1 as output. I tink that's the best solution, since we
> > > > can avoid device specific bindings and it's common to use the last port
> > > > as output (e.g. video-mux).
> > >
> > > The ports represent hardware and I think I would avoid reordering them. I
> > > wonder what would the DT folks prefer.
> > >
> >
> > I might have missed why you mention re-ordering? :)
> >
> > > The device specific property is to the point at least: it describes an
> > > orthogonal part of the device configuration. That's why I'd pick that if I
> > > were to choose. But I'll let Rob to comment on this.
> >
> > That's true indeed. Let's wait for inputs from DT people, I'm fine
> > with both approaches.
> >
> > Thanks
> > j
> >
> > >
> > > --
> > > Regards,
> > >
> > > Sakari Ailus
> > > sakari.ailus@linux.intel.com
>
>
>
> --
> Pengutronix e.K. | |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
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>
>
--
Pengutronix e.K. | |
Industrial Linux Solutions | http://www.pengutronix.de/ |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
next prev parent reply other threads:[~2019-04-16 10:46 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-18 14:12 [PATCH 0/3] media: add Toshiba TC358746 Bridge support Marco Felsch
2018-12-18 14:12 ` [PATCH 1/3] media: dt-bindings: add bindings for Toshiba TC358746 Marco Felsch
2018-12-28 23:10 ` Rob Herring
2019-02-13 17:57 ` Jacopo Mondi
2019-03-01 10:26 ` Marco Felsch
2019-03-04 9:38 ` Jacopo Mondi
2019-03-04 16:43 ` Marco Felsch
2019-02-18 10:03 ` Sakari Ailus
2019-03-01 10:52 ` Marco Felsch
2019-03-01 11:07 ` Ian Arkver
2019-03-01 13:01 ` Marco Felsch
2019-03-04 9:41 ` Jacopo Mondi
2019-03-04 12:36 ` Sakari Ailus
2019-03-04 16:55 ` Marco Felsch
2019-03-04 18:17 ` Sakari Ailus
2019-03-05 8:49 ` Jacopo Mondi
2019-03-05 18:14 ` Marco Felsch
2019-04-16 10:45 ` Marco Felsch [this message]
2019-04-29 16:44 ` Marco Felsch
2019-03-04 12:10 ` Sakari Ailus
2018-12-18 14:12 ` [PATCH 2/3] media: tc358746: add Toshiba TC358746 Parallel to CSI-2 bridge driver Marco Felsch
2018-12-19 1:24 ` kbuild test robot
2018-12-20 19:37 ` kbuild test robot
2019-02-18 11:25 ` Sakari Ailus
2018-12-18 14:12 ` [PATCH 3/3] media: tc358746: update MAINTAINERS file Marco Felsch
2019-02-18 11:46 ` Sakari Ailus
2019-03-04 17:31 ` Marco Felsch
2019-03-04 18:18 ` Sakari Ailus
2019-01-23 12:54 ` [PATCH 0/3] media: add Toshiba TC358746 Bridge support Marco Felsch
2019-02-12 16:10 ` Marco Felsch
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