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: Tue, 06 Oct 2015 12:08:43 +0100 Message-ID: <1444129723.4674.236.camel@infradead.org> References: <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> <1443095558.74600.84.camel@infradead.org> <20150924151546.GJ13823@e104818-lin.cambridge.arm.com> <1443118238.74600.117.camel@infradead.org> <20150925152848.GQ13823@e104818-lin.cambridge.arm.com> <560C993D.8090308@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-qHrosZRUVyWVLbGw4R/s" Cc: "steve.glendinning@shawell.net" , "netdev@vger.kernel.org" , "Rafael J. Wysocki" , Jeremy Linton , "hanjun.guo@linaro.org" , "suravee.suthikulpanit@amd.com" , "grant.likely@linaro.org" , "linux-arm-kernel@lists.infradead.org" To: Charles Garcia-Tobin , "ahs3@redhat.com" , Catalin Marinas Return-path: Received: from bombadil.infradead.org ([198.137.202.9]:40320 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751573AbbJFLI6 (ORCPT ); Tue, 6 Oct 2015 07:08:58 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: --=-qHrosZRUVyWVLbGw4R/s Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2015-10-05 at 17:20 -0700, Charles Garcia-Tobin wrote: > it in ACPI circles > unless we had wider agreement among OSs to use it. AFAIK PRP00001 has not > actually been approved yet in the specification forum, and that it in > itself is more of a concern for me,as the code has been pushed upstream. Why would that be a concern? In that context it's just one device ID. Individual devices don't *need* to be approved. OK, the 'PRP' vendor prefix is not officially assigned but that's really a trivial piece of bureaucracy. > I guess it=C2=B9s up to Catalin, but disabling for ARM seems like a good = idea > right now, another option is to add tests to FWTS. I understand the motivation to avoid embracing a whole bunch of crappy bindings. But I think that eschewing PRP0001 is the wrong technical approach to achieving that. It has false negatives =E2=80=94 as soon as you have a *single* existing DT binding, perhaps something as simple as the serial port bindings from the CHRP days, you'll be in a situation where you can't use that. I've *got* hardware where I need to advertise a serial port with a clock-frequency property because it *isn't* compatible with PNP0501. And it has false positives =E2=80=94 there's nothing to prevent people from doing ACPI-style bindings with crappy device bindings which also aren't approved. I think it's utterly na=C3=AFve to believe that simply avoiding the use of PRP0001 + compatible for matching is going to have *any* significant beneficial effect whatsoever. It only makes life harder for all concerned. Perhaps a better approach would be to introduce something like CONFIG_UNAPPROVED_BINDINGS (which can't be set on ARM64), and those drivers which use bindings that *aren't* approved by Catalin's crack team of reviewers need to depend on !UNAPPROVED_BINDINGS. To be honest, I still think even *that* is somewhat na=C3=AFve, but it's still a better way of implementing what you're actually trying to achieve, however optimistic you have to be to think it'll ever work in practice. --=20 dwmw2 --=-qHrosZRUVyWVLbGw4R/s Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 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