Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756267Ab2K0QqO (ORCPT ); Tue, 27 Nov 2012 11:46:14 -0500 Received: from opensource.wolfsonmicro.com ([80.75.67.52]:42033 "EHLO opensource.wolfsonmicro.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755804Ab2K0QqM (ORCPT ); Tue, 27 Nov 2012 11:46:12 -0500 Date: Tue, 27 Nov 2012 16:46:07 +0000 From: Mark Brown To: Laurent Pinchart Cc: Tomi Valkeinen , Thierry Reding , Tomi Valkeinen , Alex Courbot , Grant Likely , Anton Vorontsov , Stephen Warren , Mark Zhang , Rob Herring , David Woodhouse , Arnd Bergmann , "linux-tegra@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-fbdev@vger.kernel.org" , "devicetree-discuss@lists.ozlabs.org" , "linux-pm@vger.kernel.org" , Alexandre Courbot Subject: Re: [PATCHv9 1/3] Runtime Interpreted Power Sequences Message-ID: <20121127164607.GG4468@opensource.wolfsonmicro.com> References: <1353149747-31871-1-git-send-email-acourbot@nvidia.com> <6982060.HfOokt4dIn@avalon> <50B4D9E9.8070607@ti.com> <3136860.Z3VvKjeKpU@avalon> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="8/pVXlBMPtxfSuJG" Content-Disposition: inline In-Reply-To: <3136860.Z3VvKjeKpU@avalon> X-Cookie: You are always busy. User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2184 Lines: 55 --8/pVXlBMPtxfSuJG Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Nov 27, 2012 at 04:37:32PM +0100, Laurent Pinchart wrote: > One possibly crazy idea I had was to replace backlight devices as we know= them=20 > with LED devices (a LED driver IC shouldn't be supported by different API= s=20 > depending on whether the LEDs it drives are used as a backlight or not), = and=20 > have the panel hook up with the associated LED device to expose backlight= =20 > operations through the CDF. Panels with a backlight controller tied to th= e=20 > panel controller (control through DSI for instance) would implement the= =20 > backlight operations directly without instantiating a LED device. This st= ill=20 > leaves the question of the userspace backlight brightness API open. I remember looking at that before but never actually got round to it, it seems like a sensible idea to me. --8/pVXlBMPtxfSuJG Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQIcBAEBAgAGBQJQtO5HAAoJELSic+t+oim9h/cP/i717a9Sz8TheSTibWIOtSwa A45+ZL/V55CNWf1jnydvAIilGimVeumAk95Xcqh7OkLC7VoeCFP8pHoicC83ilHj KNAhd54iK3IgMskORskeZ2XAb6Nk+DRq3I28mX4hzisI69HqmeDmqiCXLJeO0D/+ YoYzyIj4ES3O7u2Asv+CS1b95biq22m3SwDqbKFTeS8hPpOnw/IzzCqp49R/sn/E LhJse7m1JoPi9o4W1+RfX0LTXSAYxsd4BMXb9qyqvUNE9FSL+l/mFOnsjEcFL/zQ U4mC/76QWBCFWdmLyHV71vV/JTXl0wr4S6ptpqeM9S6b/YO2reT919F5flqK74kf FTI5BS2ENSMXXaeVmpw7JMzvKIaKF3It0/Iy7FgIdBya0WYU/NXcFhlww6VNoFJr SC76XmGuAaOhdUYkL3LEISS5IXfoaD+OJq/x695ITfP+D5iBA6V4joPbC1kEKoNB COVPaBOTecjnKoqkPZDCw6TNLrTxCqVwo1BaO+didPejOSxxkahq8x5DrcrHb4PY YQDBRXr+ayV8uwHumaVogb+Zm4PCBFNw1XRlKs4EXkLDoAITmj1a+jqfx9TS203s lzXeCcm9i5B93sH4DzVQnEBWPeaF6uRQAkb18/tsDms9ImKr8mI69AgxBzNIAI6L pmhNMm9aDmAd3OpsIvhK =Ni3b -----END PGP SIGNATURE----- --8/pVXlBMPtxfSuJG-- -- 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/