From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: [PATCH 2/2] Convert smsc911x to use ACPI as well as DT Date: Thu, 24 Sep 2015 12:52:38 +0100 Message-ID: <1443095558.74600.84.camel@infradead.org> References: <1439417187-21411-1-git-send-email-jeremy.linton@arm.com> <1439417187-21411-3-git-send-email-jeremy.linton@arm.com> <1443033714.74600.18.camel@infradead.org> <560310EA.2070805@intel.com> <1443042212.74600.30.camel@infradead.org> <56033C10.2040708@linaro.org> <1443082579.74600.48.camel@infradead.org> <20150924103152.GG13823@e104818-lin.cambridge.arm.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-8S+Cmb59kzTQm2/Ygae6" Cc: Hanjun Guo , "Rafael J. Wysocki" , Jeremy Linton , linux-arm-kernel@lists.infradead.org, steve.glendinning@shawell.net, netdev@vger.kernel.org, grant.likely@linaro.org, Suravee.Suthikulpanit@amd.com To: Catalin Marinas Return-path: Received: from bombadil.infradead.org ([198.137.202.9]:57427 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754293AbbIXLwo (ORCPT ); Thu, 24 Sep 2015 07:52:44 -0400 In-Reply-To: <20150924103152.GG13823@e104818-lin.cambridge.arm.com> Sender: netdev-owner@vger.kernel.org List-ID: --=-8S+Cmb59kzTQm2/Ygae6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi Catalin, I understand your concerns, but I'm still not convinced of your conclusion. On Thu, 2015-09-24 at 11:31 +0100, Catalin Marinas wrote: > PRP0001 opens the door to any DT-like properties in ACPI and, knowing > how the ARM ecosystem works, I'm pretty sure we'll soon lose control (if > we haven't already; not all the developments are done in the open). No. That door is wide open already =E2=80=94 people can already do whatever they like in _DSD properties. If they're going to screw up DT properties, they'll screw up ACPI-only _DSD properties just the same. You speak of maintaining "tight control of the _DSD properties that are going to be used in ACPI tables"... but if you're going to confiscate their crackpipe and stand over them while they work, you can do that just as well whether they're using "PRP0001" or "FOO1234" as their HID value. In that sense, the HID is entirely orthogonal. And think about it... we *really* don't want a given peripheral device to have *different* bindings depending on whether it's discovered with a specific ACPI HID, vs. when it's discovered via DT or the PRP0001 HID. That way lies complete insanity. In some ways, your proposal would be actively *counterproductive*. You say you want to train people *not* to keep patching the kernel. But where they *could* have just used PRP0001 and used a pre-existing kernel, you then tell them "oh, but now you need to patch the kernel because we want you to make up a new HID and not be compatible with what already exists." If you go down this road, I predict we'll start seeing *separate* drivers for identical components, because the bindings for DT vs. ACPI properties are different. We really don't want that. > The pro ARM ACPI camp has been very vocal against DT in the server > space. I'd like to seem them as vocal about PRP0001, unless they find it > acceptable (and should apologise for bashing DT ;)). Fundamentally, that DT vs. ACPI distinction has gone away with the introduction of _DSD. We *need* the flexibility that we gain from being able to provide device properties rather than inventing a new HID for every permutation, and with that flexibility comes a certain amount of responsibility to do things sensibly. People have not always designed their bindings sensibly. But that isn't going to be magically solved in the ACPI world, unless you *do* actually stand over them with their crackpipe in your hand, as I joked above. And eschewing PRP0001 really doesn't help you with that. 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