Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756102Ab2HUJy3 (ORCPT ); Tue, 21 Aug 2012 05:54:29 -0400 Received: from na3sys009aog103.obsmtp.com ([74.125.149.71]:37878 "EHLO na3sys009aog103.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754245Ab2HUJy0 (ORCPT ); Tue, 21 Aug 2012 05:54:26 -0400 Message-ID: <1345542860.4085.40.camel@deskari> Subject: Re: [PATCH v4 1/3] Runtime Interpreted Power Sequences From: Tomi Valkeinen To: Thierry Reding Cc: Alex Courbot , Stephen Warren , Simon Glass , Grant Likely , Rob Herring , Mark Brown , Anton Vorontsov , David Woodhouse , Arnd Bergmann , Leela Krishna Amudala , "linux-tegra@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-fbdev@vger.kernel.org" , "devicetree-discuss@lists.ozlabs.org" , "linux-doc@vger.kernel.org" Date: Tue, 21 Aug 2012 12:54:20 +0300 In-Reply-To: <20120821091306.GA4819@avionic-0098.mockup.avionic-design.de> References: <1345097337-24170-1-git-send-email-acourbot@nvidia.com> <1345097337-24170-2-git-send-email-acourbot@nvidia.com> <1345535069.4085.7.camel@deskari> <1562509.b0FYTUZ1D8@percival> <20120821083329.GA28992@avionic-0098.adnet.avionic-design.de> <1345539465.4085.22.camel@deskari> <20120821091306.GA4819@avionic-0098.mockup.avionic-design.de> Content-Type: multipart/signed; micalg="pgp-sha1"; protocol="application/pgp-signature"; boundary="=-7E61pVNOK8ptK17BGKHa" X-Mailer: Evolution 3.2.3-0ubuntu6 Mime-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3825 Lines: 91 --=-7E61pVNOK8ptK17BGKHa Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2012-08-21 at 11:13 +0200, Thierry Reding wrote: > On Tue, Aug 21, 2012 at 11:57:45AM +0300, Tomi Valkeinen wrote: > > This doesn't mean that we'd have a separate driver for each device. For > > example, we have a generic panel driver in OMAP, which contains a kind > > of small panel database. The panel database contains the name of the > > panel as a key, and panel specific configuration as a value. This > > configuration could also contain some kind of generic power sequence. >=20 > I see. I do like the idea of it, because it is more straightforward than > representing the whole sequence in DT. Matching could be done using the > standard compatible property. Right. > However this also means we'll essentially just be moving the board code. What do you mean "just"? Wasn't the point of the whole "arm board file mess" to get rid of the code from the board files? If the code in the board file is device specific code, not board specific, then the driver of the device is a logical place to place it. And as I said, I don't have any problems with some kind of generic power sequences. So the code in the board file could be moved and converted to use the power sequences, if that is better than just plain c code. > Being in a central location it would be easier to refactor commonalities > though. >=20 > > I'd like to require the board developer to only fill in to the DT data > > what panel he is using, and how it's connected on his board. Not panel'= s > > internal functionality. >=20 > The amount of work required by the board developer would largely depend > on whether support for the panel is already present or not. For new > panels this would mean that a new driver needs to be written, while > representing the power sequence in DT might be easier to do, and readily > available from some datasheet. That's true. However, if we already have a generic driver for that type of panel, (which we would need anyway for the DT based approach), the developer only needs to add the name of the panel and the data for the power sequence to the panel driver's database, which is about the same amount of work as with DT. So it's really just a question of where to put the data in question, DT or driver. Both contain the same data, and the data structure may also be the same. In DT's case it just needs to be parsed first, whereas in database case you'll enter the data in structs. Tomi --=-7E61pVNOK8ptK17BGKHa Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIcBAABAgAGBQJQM1rMAAoJEPo9qoy8lh71Dz4QAIt9FeQ0fcNavme5qLDfvdxb AK/z9/DPBICHd9srOzUZ94EkVClmGDwQ18V18UgVnxBYbengCcaUCgWYH32u1IBf h9p3mIeK7wNFimR3fygJCkuzveBvpMu6dFmYpUwOBdLNvS69l9C9TUKSgTmgvgR/ wWyBSMTWgR+1zM9FWv5muVfIK5K3r0TCL1Ypy0CKsgKQl9hG9akRRxW9Zc8ZtHsz GO0xWoSHbSyKcspVIXOcZm3+ZDrvyPrrn3WSgOUQ6Q0ss/crdyTUzgVthr86bU4k HE/iuvCv/LnxyZBNzJpFlj35hiATFFvE+R+dP/ZHB9c2OwkhtJ121ZA5PIuK1n6C SatzFXHxdeAwnKKWmhZoRqip5jOd3b94sPn+Njbgrp0sWlVu+MB0ULUcMZu+Zg5e 9SPIsscsG54eY92cASxWAgkR+yTfoyS67oTHvbjgsy/8TxbqF4e+rP2ed9WJj/LY ww0PW0E1lL/LQ79QndJ+PNnA6Mcm4Z8gLoNh3jq+URzctRt1QI87BgjC0rA8ZHo/ nn/0ruLuiFIFHaHQT56JRhub4phy5fpGCKeq1ygkRXBZFAOunPA6NUoZVo4b7ORv AiKa9PtnRqF+6q7Aqo8ip6/21PoEHFI6eCem9DjzmHxFOJE3XKCn0HPVJBpbJQje YDJ2tGzgU3fI6+pfnPeA =NTnp -----END PGP SIGNATURE----- --=-7E61pVNOK8ptK17BGKHa-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/