From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753024AbcD1Oiw (ORCPT ); Thu, 28 Apr 2016 10:38:52 -0400 Received: from mezzanine.sirena.org.uk ([106.187.55.193]:54920 "EHLO mezzanine.sirena.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751865AbcD1Oit (ORCPT ); Thu, 28 Apr 2016 10:38:49 -0400 Date: Thu, 28 Apr 2016 15:38:01 +0100 From: Mark Brown To: Arnd Bergmann Cc: Sagar Dharia , gregkh@linuxfoundation.org, bp@suse.de, poeschel@lemonage.de, treding@nvidia.com, gong.chen@linux.intel.com, andreas.noever@gmail.com, alan@linux.intel.com, mathieu.poirier@linaro.org, daniel@ffwll.ch, jkosina@suse.cz, sharon.dvir1@mail.huji.ac.il, joe@perches.com, davem@davemloft.net, james.hogan@imgtec.com, michael.opdenacker@free-electrons.com, daniel.thompson@linaro.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kheitke@audience.com, mlocke@codeaurora.org, agross@codeaurora.org, sheetal.tigadoli@gmail.com, linux-arm-msm@vger.kernel.org Message-ID: <20160428143801.GO3217@sirena.org.uk> References: <1461801489-16254-1-git-send-email-sdharia@codeaurora.org> <2692115.H6acsZmTjn@wuerfel> <20160428115337.GN3217@sirena.org.uk> <7478716.z4vdp0mVTA@wuerfel> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="CIaS999JRh1EGVx5" Content-Disposition: inline In-Reply-To: <7478716.z4vdp0mVTA@wuerfel> X-Cookie: Tomorrow, you can be anywhere. User-Agent: Mutt/1.5.24 (2015-08-30) X-SA-Exim-Connect-IP: 2a01:348:6:8808:fab::3 X-SA-Exim-Mail-From: broonie@sirena.org.uk Subject: Re: [PATCH V5 1/6] SLIMbus: Device management on SLIMbus X-SA-Exim-Version: 4.2.1 (built Mon, 26 Dec 2011 16:24:06 +0000) X-SA-Exim-Scanned: Yes (on mezzanine.sirena.org.uk) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --CIaS999JRh1EGVx5 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Thu, Apr 28, 2016 at 02:33:41PM +0200, Arnd Bergmann wrote: > On Thursday 28 April 2016 12:53:37 Mark Brown wrote: > > On Thu, Apr 28, 2016 at 12:00:26PM +0200, Arnd Bergmann wrote: > > > This looks like an artifact of ancient pre-DT times. I'd say kill it off before > > > someone starts using it. > > Not every architecture uses DT, and even on architectures with DT > > support it isn't always the only firmware. In this specific case it's > > questionable how many people are going to implement Slimbus at this > > point but in general insisting that we go DT only doesn't seem great. > Nothing wrong with adding support for manual board files later if > we have a good reason for it, but at the moment, this seems completely > ARM/ARM64 specific. It's not in theory, but in practice nobody other that Qualcomm is ever likely to release a controller. > I don't foresee mobile phones with ACPI using this subsystem, but even > if we got them, it would be a horrible idea to use hardcoded board > specific tables in a platform file, and we should insist that whatever > firmware is present has a way to describe the slimbus devices. Right, in this particular case I don't think it makes a huge difference but what you were talking about was "ancient pre-DT times" rather than something specific to this particular case. That's definitely a thing that people keep thinking and it's good to push back on it since we do have non-DT cases to worry about (some architectures, other firmwares, things like PCI cards with other components on them and so on). --CIaS999JRh1EGVx5 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAEBCAAGBQJXIiBIAAoJECTWi3JdVIfQeJoH/3zXqbIT+UR/hgabRS5CoAH1 hqewVtNkBcDbY9EE/6OEcbiXQbj2hU7HYqgjG/1HIH0U17DC4gURqhslB/5PNl9r Ejq1Z7eGI/7tYKy0VxtVrojzGDQ6u8CknvxsBHDuXwCtCGV2W17I+wAEBdw00J6A i89eBpChQmgIlqNUKVhMBNNHZj7zIBvq1ywGWSjr5xmAlA2OXqe6hHdTfgsHhmuv 1ngQ7CXwCq1j3EnrdPQ1oML5uUsBbNaB9L7A/v2qDoza0PC0wyrDbx8ej0HJVyYP CcYvMo3nylPSsf4cguKO1IvGqjOuft4T8OPMfH/1Dnh+G0vpwd3eMTAQoVzBAn4= =oejk -----END PGP SIGNATURE----- --CIaS999JRh1EGVx5--