From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Subject: Re: [PATCH V7 11/12] Documentation: bridge: Add documentation for ps8622 DT properties Date: Tue, 23 Sep 2014 12:40:24 +0300 Message-ID: <54214008.4040105@ti.com> References: <1409150399-12534-1-git-send-email-ajaykumar.rs@samsung.com> <5419760A.7020908@ti.com> <5419B52D.4060107@ti.com> <20140922080629.GC1470@ulmo> <542030DD.3060906@ti.com> <20140923060452.GD30514@ulmo> <5421201C.6000509@samsung.com> <20140923083514.GM30514@ulmo> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="jgPCRJOE9GamS4RJAFkDs7x7i3DQ7dEj4" Return-path: In-Reply-To: <20140923083514.GM30514@ulmo> Sender: linux-samsung-soc-owner@vger.kernel.org To: Thierry Reding , Andrzej Hajda Cc: "devicetree@vger.kernel.org" , "linux-samsung-soc@vger.kernel.org" , Sean Paul , Daniel Vetter , sunil joshi , "dri-devel@lists.freedesktop.org" , Laurent Pinchart , Ajay kumar , Prashanth G , Ajay Kumar List-Id: devicetree@vger.kernel.org --jgPCRJOE9GamS4RJAFkDs7x7i3DQ7dEj4 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable On 23/09/14 11:35, Thierry Reding wrote: > Well, a display controller is never going to attach to a panel directly= =2E With parallel RGB, that (almost) happens. There's voltage level shifting probably in the middle, but I don't see anything else there. > But I agree that it would be nice to unify bridges and encoders more. I= t > should be possible to make encoder always a bridge (or perhaps even > replace encoders with bridges altogether). Then once you're out of the > DRM device everything would be a bridge until you get to a panel. What exactly is a bridge and what is an encoder? Those are DRM constructs, aren't they? As I see it, a video pipeline consist of a video source (display controller usually), a chain of encoders (all of which may not be strictly "encoders", they could be level shifters, muxes, ESD protection devices or such), and either a display device like a panel or a connector to outside world. Am I right that in DRM world the encoder is the first device in the display chain after the display controller, and the next is a bridge? That sounds totally artificial, and I hope we don't reflect that in the DT side in any way. Tomi --jgPCRJOE9GamS4RJAFkDs7x7i3DQ7dEj4 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUIUAIAAoJEPo9qoy8lh71bQkQALID0gvQwN2K5pzBAC/4w2Kk 8XxJyySfCoAy72MKHSAWXTZ41QzMQ5FFErHeR589EtzJkzxxQ2zSz7+r0dYq2is2 E9p06RR0p2EuYNmx2PZme1iGeLYJcITbvRwwdTQBy7I1a5cbzHQGZdI2s8gB7c3N EgaVYT9FL0mBDU8foTJVCNdtP8yohElgScE2EuIwigykrK26SGmXmFXHd33dUo9s KWrN6wNSxtdNHDcYe2BvwUefuiU0O+1O5kYbgOs02aIg73A3ksv1a2RDPW2KoR9k TfGVr27Cvbf2diw1fiv6yKYGuCkBOGIK89Rt5bc8gRmUpXYvbc37QVwE1QFSyBb0 jJWquHhhLqtPdmFn5fpOA7f86GN4ncxaz49DkbA3oCp+fLXS+pp4oIFVrYkALEA/ g4GpOvMEevyrIgrmyoUEk3KXcZu7eo714YS65/jM3hK8e8rr90rYMbddvLcKUGwr L2ffaZeYbdgvqQFvhjv85/XhAE0xuy5RJBMhfhbko4jRuYg6A5eq8Ga8DbOgea4P S+m0jF5XheJU8deCE/c2VX4KBB0ophj5IFELZ8W8FG0f32NzrASSCAMXZprs1WvI 3BGqM2OwNUUdb9yF/WLEn4FdEyXmvcUxODMDslWRLP7KQqUVqHPcwBq6ThgvWbGb Ze+VdOPpTZAmVGirAshW =ZVuj -----END PGP SIGNATURE----- --jgPCRJOE9GamS4RJAFkDs7x7i3DQ7dEj4--