From: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org> To: Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org>, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org> Cc: "devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, "linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" <linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>, Rob Herring <robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org> Subject: Re: ACPI vs DT at runtime Date: Thu, 21 Nov 2013 16:37:43 +0000 [thread overview] Message-ID: <20131121163743.E45BFC406A3@trevor.secretlab.ca> (raw) In-Reply-To: <20131119181959.GA20967-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> On Tue, 19 Nov 2013 10:19:59 -0800, Olof Johansson <olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org> wrote: > I think we're getting bogged down by the hypothetical AML-in-DT case. We won't > know if we want/need it until we see what kind of stuff vendors think they will > need to do in AML. On x86 it's mostly used to abstract out per-board > differences, not whole SoC behavior. It also depends on how much of their > hardware differences the silicon vendors decide to punt to software to manage > -- that's going to work a lot less well in this type of environment than it > does on 32-bit today. I'm going to go out on a limb here and say flat out "no" to AML in DT. AML in DT makes no sense to me. I've resisted any attempts to add a bytecode to FDT. The whole model we've been working on with DT is describe the hardware as competently as possible and expect device drivers to bind on the platform to handle the fiddly bits. ACPI takes the opposite approach and I don't want to go down the path of pushing functionality out to the platform when using the DT infrastructure. ... That said, I'm not opposed to the ACPI and DT subsystems making use of shared infrastructure wherever possible. > > If a vendor does this, with a DTB that correctly describes their > > hardware then I am not against it (and would prefer this case to mapping > > from ACPI to DT). For that case we will also require a nailed-down boot > > protocol that allows for either DTB or ACPI (only one at a time). > > UEFI already allows this, as far as I know? Even if both are passed, we can > easily make DT take precedence over ACPI, just like DT overrides ATAGs today. Yes, there is no problem with a platform passing both DT and ACPI. g. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html
WARNING: multiple messages have this Message-ID (diff)
From: grant.likely@secretlab.ca (Grant Likely) To: linux-arm-kernel@lists.infradead.org Subject: ACPI vs DT at runtime Date: Thu, 21 Nov 2013 16:37:43 +0000 [thread overview] Message-ID: <20131121163743.E45BFC406A3@trevor.secretlab.ca> (raw) In-Reply-To: <20131119181959.GA20967@quad.lixom.net> On Tue, 19 Nov 2013 10:19:59 -0800, Olof Johansson <olof@lixom.net> wrote: > I think we're getting bogged down by the hypothetical AML-in-DT case. We won't > know if we want/need it until we see what kind of stuff vendors think they will > need to do in AML. On x86 it's mostly used to abstract out per-board > differences, not whole SoC behavior. It also depends on how much of their > hardware differences the silicon vendors decide to punt to software to manage > -- that's going to work a lot less well in this type of environment than it > does on 32-bit today. I'm going to go out on a limb here and say flat out "no" to AML in DT. AML in DT makes no sense to me. I've resisted any attempts to add a bytecode to FDT. The whole model we've been working on with DT is describe the hardware as competently as possible and expect device drivers to bind on the platform to handle the fiddly bits. ACPI takes the opposite approach and I don't want to go down the path of pushing functionality out to the platform when using the DT infrastructure. ... That said, I'm not opposed to the ACPI and DT subsystems making use of shared infrastructure wherever possible. > > If a vendor does this, with a DTB that correctly describes their > > hardware then I am not against it (and would prefer this case to mapping > > from ACPI to DT). For that case we will also require a nailed-down boot > > protocol that allows for either DTB or ACPI (only one at a time). > > UEFI already allows this, as far as I know? Even if both are passed, we can > easily make DT take precedence over ACPI, just like DT overrides ATAGs today. Yes, there is no problem with a platform passing both DT and ACPI. g.
next prev parent reply other threads:[~2013-11-21 16:37 UTC|newest] Thread overview: 186+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-11-15 1:44 ACPI vs DT at runtime Olof Johansson 2013-11-15 1:44 ` Olof Johansson 2013-11-15 9:57 ` Mark Rutland 2013-11-15 9:57 ` Mark Rutland [not found] ` <20131115175241. GB27174@quad.lixom.net> [not found] ` <20131115095717.GC1709-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-15 17:52 ` Olof Johansson 2013-11-15 17:52 ` Olof Johansson 2013-11-15 18:13 ` David Goodenough 2013-11-21 16:15 ` Grant Likely 2013-11-18 17:47 ` Jon Masters 2013-11-18 17:47 ` Jon Masters [not found] ` <20131115175241.GB27174-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-15 18:08 ` Russell King - ARM Linux 2013-11-15 18:08 ` Russell King - ARM Linux [not found] ` <20131115180832.GR16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-15 18:42 ` Olof Johansson 2013-11-15 18:42 ` Olof Johansson 2013-11-15 19:56 ` Arnd Bergmann 2013-11-15 19:56 ` Arnd Bergmann [not found] ` <201311152056.47846.arnd-r2nGTMty4D4@public.gmane.org> 2013-11-15 23:21 ` Russell King - ARM Linux 2013-11-15 23:21 ` Russell King - ARM Linux [not found] ` <20131115232109.GT16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-18 15:05 ` Arnd Bergmann 2013-11-18 15:05 ` Arnd Bergmann [not found] ` <201311181605.37300.arnd-r2nGTMty4D4@public.gmane.org> 2013-11-18 15:19 ` Russell King - ARM Linux 2013-11-18 15:19 ` Russell King - ARM Linux 2013-11-18 15:46 ` Arnd Bergmann 2013-11-18 15:46 ` Arnd Bergmann 2013-11-21 16:10 ` Grant Likely 2013-11-21 16:10 ` Grant Likely [not found] ` <20131121161037.C528CC406A3-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2013-11-21 18:26 ` Arnd Bergmann 2013-11-21 18:26 ` Arnd Bergmann 2013-11-21 19:40 ` Mark Brown 2013-11-21 19:40 ` Mark Brown [not found] ` <20131118151900.GF16735@ n2100.arm.linux.org.uk> [not found] ` <20131118151900.GF16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-21 16:11 ` Grant Likely 2013-11-21 16:11 ` Grant Likely 2013-11-21 16:00 ` Grant Likely 2013-11-21 16:00 ` Grant Likely 2013-11-19 11:30 ` Mark Rutland 2013-11-19 11:30 ` Mark Rutland 2013-11-19 11:35 ` Mark Rutland 2013-11-19 11:35 ` Mark Rutland [not found] ` <20131119113557.GI5914-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-19 11:51 ` Leif Lindholm 2013-11-19 11:51 ` Leif Lindholm [not found] ` <20131119113015.GH5914-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-19 11:57 ` Russell King - ARM Linux 2013-11-19 11:57 ` Russell King - ARM Linux 2013-11-19 13:56 ` Stefano Stabellini 2013-11-19 13:56 ` Stefano Stabellini 2013-11-19 14:38 ` Mark Rutland 2013-11-19 14:38 ` Mark Rutland [not found] ` <20131119143840.GN5914-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-19 14:59 ` Leif Lindholm 2013-11-19 14:59 ` Leif Lindholm 2013-11-19 18:23 ` Olof Johansson 2013-11-19 18:23 ` Olof Johansson 2013-11-19 14:05 ` Arnd Bergmann 2013-11-19 14:05 ` Arnd Bergmann 2013-11-19 15:21 ` Mark Rutland 2013-11-19 15:21 ` Mark Rutland [not found] ` <20131119152157.GO5914-NuALmloUBlrZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org> 2013-11-19 16:19 ` Arnd Bergmann 2013-11-19 16:19 ` Arnd Bergmann 2013-11-19 18:34 ` Olof Johansson 2013-11-19 18:34 ` Olof Johansson 2013-11-19 19:06 ` Tom Rini 2013-11-19 19:06 ` Tom Rini 2013-11-19 18:19 ` Olof Johansson 2013-11-19 18:19 ` Olof Johansson [not found] ` <20131119181959.GA20967-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-21 16:37 ` Grant Likely [this message] 2013-11-21 16:37 ` Grant Likely 2013-11-21 16:29 ` Grant Likely 2013-11-21 16:29 ` Grant Likely [not found] ` <20131121170122. GB22960@srcf.ucam.org> [not found] ` <20131121170122.GB22960-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org> 2013-11-21 18:38 ` Grant Likely 2013-11-21 18:38 ` Grant Likely [not found] ` <20131121162944.F087FC406A3-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2013-11-21 17:01 ` Matthew Garrett 2013-11-21 17:01 ` Matthew Garrett 2013-11-21 17:58 ` Olof Johansson 2013-11-21 17:58 ` Olof Johansson [not found] ` <20131121175822.GA9590-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-21 18:19 ` Matthew Garrett 2013-11-21 18:19 ` Matthew Garrett 2013-11-21 18:33 ` Arnd Bergmann 2013-11-21 18:33 ` Arnd Bergmann 2013-11-21 18:54 ` Russell King - ARM Linux 2013-11-21 18:54 ` Russell King - ARM Linux [not found] ` <20131121185408.GX16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-21 18:59 ` Olof Johansson 2013-11-21 18:59 ` Olof Johansson [not found] ` <CAOesGMgzUSMDy99XojipfRd5OM88UhfbCYO0aoc5m-Q8Fwnddg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-21 19:01 ` Russell King - ARM Linux 2013-11-21 19:01 ` Russell King - ARM Linux [not found] ` <20131121190126.GZ16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-21 19:31 ` Olof Johansson 2013-11-21 19:31 ` Olof Johansson [not found] ` < CAOesGMgzUSMDy99XojipfRd5OM88UhfbCYO0aoc5m-Q8Fwnddg@mail.gmail.com> [not found] ` < 20131121190126.GZ16735@n2100.arm.linux.org.uk> [not found] ` < CAOesGMgxGq1Zmo+Dq-Rmy2F02-=12yUzB0AKn35yK2j3CacNRQ@mail.gmail.com> [not found] ` <CAOesGMgxGq1Zmo+Dq-Rmy2F02-=12yUzB0AKn35yK2j3CacNRQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-21 20:44 ` Grant Likely 2013-11-21 20:44 ` Grant Likely 2013-11-21 18:53 ` Mark Brown 2013-11-21 18:53 ` Mark Brown 2013-11-15 18:28 ` Jason Gunthorpe 2013-11-15 18:28 ` Jason Gunthorpe [not found] ` <20131115182826.GB14920-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org> 2013-11-15 18:57 ` Arnd Bergmann 2013-11-15 18:57 ` Arnd Bergmann 2013-11-20 13:49 ` Grant Likely 2013-11-20 13:49 ` Grant Likely [not found] ` <20131120134942.95DBFC4079D-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2013-11-20 17:43 ` Stefano Stabellini 2013-11-20 17:43 ` Stefano Stabellini [not found] ` <alpine.DEB.2.02.1311201737410.3198-7Z66fg9igcxYtxbxJUhB2Dgeux46jI+i@public.gmane.org> 2013-11-20 17:47 ` Olof Johansson 2013-11-20 17:47 ` Olof Johansson 2013-11-18 5:19 ` Jon Masters 2013-11-18 5:26 ` Jon Masters [not found] ` <5289A4F3.5040203-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 19:25 ` Olof Johansson 2013-11-18 19:25 ` Olof Johansson [not found] ` <20131118192552.GD5886-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-18 20:43 ` Jon Masters 2013-11-18 20:43 ` Jon Masters [not found] ` <528A7BFD.4020303-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 21:25 ` Olof Johansson 2013-11-18 21:25 ` Olof Johansson 2013-11-18 7:22 ` Richard Cochran 2013-11-18 13:55 ` Stefano Stabellini 2013-11-18 15:00 ` Mark Brown [not found] ` <20131118150052.GC24408-GFdadSzt00ze9xe1eoZjHA@public.gmane.org> 2013-11-18 19:13 ` Olof Johansson 2013-11-18 19:13 ` Olof Johansson [not found] ` <20131118191336.GB5886-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-19 9:12 ` Richard Cochran 2013-11-19 9:12 ` Richard Cochran 2013-11-19 18:48 ` Olof Johansson 2013-11-19 18:48 ` Olof Johansson [not found] ` <20131119184827.GD20967-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-20 6:40 ` Richard Cochran 2013-11-20 6:40 ` Richard Cochran 2013-11-21 18:16 ` Grant Likely 2013-11-21 18:16 ` Grant Likely 2013-11-21 19:21 ` Russell King - ARM Linux 2013-11-21 19:21 ` Russell King - ARM Linux [not found] ` < 20131121192136.GA16735@n2100.arm.linux.org.uk> [not found] ` <20131121192136.GA16735-l+eeeJia6m9vn6HldHNs0ANdhmdF6hFW@public.gmane.org> 2013-11-21 20:47 ` Grant Likely 2013-11-21 20:47 ` Grant Likely [not found] ` <20131121204704.E4487C40753-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2013-11-22 11:43 ` Catalin Marinas 2013-11-22 11:43 ` Catalin Marinas [not found] ` <CAHkRjk5MstjD9JFk+co8k89i8geJBmSF6uObhGdmWSe0GJHo8g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-22 12:00 ` Pantelis Antoniou 2013-11-22 12:00 ` Pantelis Antoniou [not found] ` <97692EF2-013E-4E4B-BC16-E0915D67EFEC-wVdstyuyKrO8r51toPun2/C9HSW9iNxf@public.gmane.org> 2014-05-05 7:06 ` Alexander Holler 2014-05-05 7:06 ` Alexander Holler [not found] ` <53673866.9000105-SXC+2es9fhnfWeYVQQPykw@public.gmane.org> 2014-05-05 14:41 ` Arnd Bergmann 2014-05-05 14:41 ` Arnd Bergmann 2014-05-05 15:29 ` Alexander Holler 2014-05-05 15:29 ` Alexander Holler [not found] ` <5367AE6B.3010105-SXC+2es9fhnfWeYVQQPykw@public.gmane.org> 2014-05-05 17:29 ` Arnd Bergmann 2014-05-05 17:29 ` Arnd Bergmann 2014-05-06 15:37 ` Grant Likely 2014-05-06 15:37 ` Grant Likely 2014-05-06 15:27 ` Grant Likely 2014-05-06 15:27 ` Grant Likely [not found] ` <20140506152725.E5B90C40959-WNowdnHR2B42iJbIjFUEsiwD8/FfD2ys@public.gmane.org> 2014-05-06 16:32 ` Olof Johansson 2014-05-06 16:32 ` Olof Johansson 2013-11-18 15:28 ` Rob Herring [not found] ` <5289A356.4060004-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 19:09 ` Olof Johansson 2013-11-18 19:09 ` Olof Johansson [not found] ` <20131118190929.GA5886-O5ziIzlqnXUVNXGz7ipsyg@public.gmane.org> 2013-11-18 20:54 ` Jon Masters 2013-11-18 20:54 ` Jon Masters [not found] ` <528A7EA0.9050101-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 21:50 ` Olof Johansson 2013-11-18 21:50 ` Olof Johansson 2013-11-18 21:32 ` Grant Likely 2013-11-18 21:32 ` Grant Likely 2013-11-18 22:47 ` David Goodenough 2013-11-19 12:48 ` Arnd Bergmann 2013-11-19 12:48 ` Arnd Bergmann 2013-11-19 13:34 ` David Goodenough 2013-11-19 16:52 ` Arnd Bergmann 2013-11-21 18:23 ` Grant Likely 2013-11-19 14:33 ` Grant Likely [not found] ` <CAOesGMjKeRb=fFJM0MabDihbEiCGM4EqW9D5i_6-RFxTnpB4Qw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-15 20:58 ` Arnd Bergmann 2013-11-15 20:58 ` Arnd Bergmann [not found] ` <201311152158.32644.arnd-r2nGTMty4D4@public.gmane.org> 2013-11-15 21:44 ` Olof Johansson 2013-11-15 21:44 ` Olof Johansson [not found] ` <CAOesGMhkCn2zeJj_ZZAZu_wJya-4evWEqNHpVJEpjxzWHVWY3A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-17 17:18 ` Stefano Stabellini 2013-11-17 17:18 ` Stefano Stabellini [not found] ` <alpine.DEB.2.02.1311171705130.4714-7Z66fg9igcxYtxbxJUhB2Dgeux46jI+i@public.gmane.org> 2013-11-17 18:10 ` Arnd Bergmann 2013-11-17 18:10 ` Arnd Bergmann [not found] ` < CAOesGMiYyOcvr3Aqs-p8zc=XDwJM9NZtNxtxrTZssc6F=siZCw@mail.gmail.com> 2013-11-17 22:20 ` Olof Johansson 2013-11-17 22:20 ` Olof Johansson [not found] ` <CAOesGMiYyOcvr3Aqs-p8zc=XDwJM9NZtNxtxrTZssc6F=siZCw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-18 8:45 ` Arnd Bergmann 2013-11-18 8:45 ` Arnd Bergmann 2013-11-18 17:33 ` Jon Masters 2013-11-18 17:38 ` Russell King - ARM Linux [not found] ` <528A4F5F.7080104-Zp4isUonpHBD60Wz+7aTrA@public.gmane.org> 2013-11-18 19:21 ` Olof Johansson 2013-11-18 19:21 ` Olof Johansson 2013-11-21 18:26 ` Grant Likely 2013-11-18 15:04 ` Mark Brown 2013-11-18 15:04 ` Mark Brown 2013-11-18 15:10 ` Arnd Bergmann 2013-11-18 15:10 ` Arnd Bergmann [not found] ` < 201311181610.33105.arnd@arndb.de> [not found] ` <201311181610.33105.arnd-r2nGTMty4D4@public.gmane.org> 2013-11-18 21:38 ` Grant Likely 2013-11-18 21:38 ` Grant Likely 2013-11-18 23:25 ` Leif Lindholm 2013-11-18 23:25 ` Leif Lindholm [not found] ` <20131118232536.GF1567-GZEopFhza0F985/tl1ce8aaDwS/vmuI7@public.gmane.org> 2013-11-18 23:29 ` Olof Johansson 2013-11-18 23:29 ` Olof Johansson [not found] ` <CAOesGMh373ZsLzoGHJm+xV3uFVjh2CBSA8SXY4PA+VxL3a5W1w-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> 2013-11-18 23:34 ` Leif Lindholm 2013-11-18 23:34 ` Leif Lindholm
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20131121163743.E45BFC406A3@trevor.secretlab.ca \ --to=grant.likely-s3s/wqlpoipyb63q8fvjnq@public.gmane.org \ --cc=arnd-r2nGTMty4D4@public.gmane.org \ --cc=devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org \ --cc=linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org \ --cc=mark.rutland-5wv7dgnIgG8@public.gmane.org \ --cc=olof-nZhT3qVonbNeoWH0uzbU5w@public.gmane.org \ --cc=robherring2-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.