From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tomi Valkeinen Subject: Re: [PATCH/RFC v3 08/19] video: display: Add MIPI DBI bus support Date: Mon, 26 Aug 2013 14:10:50 +0300 Message-ID: <521B37BA.50706@ti.com> References: <1376068510-30363-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> <1376068510-30363-9-git-send-email-laurent.pinchart+renesas@ideasonboard.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2031017713==" Return-path: Received: from arroyo.ext.ti.com (arroyo.ext.ti.com [192.94.94.40]) by gabe.freedesktop.org (Postfix) with ESMTP id C6E91E70B2 for ; Mon, 26 Aug 2013 04:20:46 -0700 (PDT) In-Reply-To: <1376068510-30363-9-git-send-email-laurent.pinchart+renesas@ideasonboard.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: Laurent Pinchart Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, Jesse Barnes , Benjamin Gaignard , Tom Gall , Kyungmin Park , linux-media@vger.kernel.org, Stephen Warren , Mark Zhang , =?ISO-8859-1?Q?St=E9phane_Marchesin?= , Alexandre Courbot , Ragesh Radhakrishnan , Thomas Petazzoni , Sunil Joshi , Maxime Ripard , Vikas Sajjan , Marcus Lorentzon List-Id: dri-devel@lists.freedesktop.org --===============2031017713== Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="GOjMlv17DbtGnovto0KwiawoAq7mitcXg" --GOjMlv17DbtGnovto0KwiawoAq7mitcXg Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi, On 09/08/13 20:14, Laurent Pinchart wrote: > MIPI DBI is a configurable-width parallel display bus that transmits > commands and data. >=20 > Add a new DBI Linux bus type that implements the usual bus > infrastructure (including devices and drivers (un)registration and > matching, and bus configuration and access functions). This has been discussed before, but I don't remember that the issue would have been cleared, so I'm bringing it up again. What benefit does a real Linux DBI (or DSI) bus give us, compared to representing the DBI the same way as DPI? DBI & DSI are in practice point-to-point buses, and they do not support probing. Is it just that because DBI and DSI can be used to control a device, they have to be Linux buses? How do you see handling the devices where DBI or DSI is used for video only, and the control is handled via, say, i2c? The module has to register two drivers, and try to keep those in sync? I feel that could get rather hacky. A real Linux bus would be necessary if we had devices that used DBI or DSI only for control, and some other video bus for video data. But that sounds so silly that I think we can just forget about the case. Thus DBI and DSI are used either for video only, or video and control. Tomi --GOjMlv17DbtGnovto0KwiawoAq7mitcXg Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJSGze6AAoJEPo9qoy8lh71RSAP/jmIujwDTl/A03hzA25GuR8N Pp+DHl8wowvKeDMy2xNQLCLzPEoAaorgfa28oLl2dKTBieUv/ZdhH624fmr3dcMR IGvfWRS3AB9Deyfbj2joce7cy2beXrez3igUUC87b2eV2jBGnRfZT9fNGH5CG708 sS5wNIQkojAfemTEQ8TjegM/tt/mGATqm5pbCiOSaybluhTrGZmpt71wXwQQKiLx 5Yz5e4BQHRd7FPw1D9wfLFn2IxM/yM2CoslZaYaL+5tlbp+aYfisXnl15KoDvvOv eiLE6QateuFmxNTruE4IpR+jhYR4UeFnyYyj/t+rtU2k6i+cGZMzrrm4XR5SmLJo /Jpe3fWwWfSIrvZ1hmw08ZhubRXPlznHM/LjKhvKz8QcV/xktXoGIl57jIxVQndP I4pw/Cw/Nsc55LSce9GMyxrsSP6W3mulDn79CTnrDw0QHVwmfpXVSBYG4QTsPnRH OS+Y7ibnA5FMiMcO6HQZoExngZ59RGC9vwdaIH70jsKcoLYGotd+Ap9Sybj3r/Sf SCwxiKTIPBFb+Or1SnC3vGbI/po9FAN9mMmZzX53wn3qdXqHPQ/wVEUG5DbfqwRd 1S61pYm2AdrnWjR9FWnyO/5ygPR2tClguCI5SM2YdGyDaDPPfcsgZdacCxkL7PV2 ixHITOYIrL8nfNWpN9z/ =7ZMH -----END PGP SIGNATURE----- --GOjMlv17DbtGnovto0KwiawoAq7mitcXg-- --===============2031017713== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/dri-devel --===============2031017713==--