From: "M. Warner Losh" <imp-uzTCJ5RojNnQT0dZR+AlfA@public.gmane.org>
To: grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org
Cc: linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org,
nico-vtqb6HGKxmzR7s880joybQ@public.gmane.org,
Catalin.Marinas-5wv7dgnIgG8@public.gmane.org,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
Philippe.Robin-5wv7dgnIgG8@public.gmane.org,
jeremy.kerr-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org
Subject: Re: [RFC PATCH 13/14] ARM: vexpress: Definition of vexpress dts specification
Date: Fri, 20 Aug 2010 15:03:36 -0600 (MDT) [thread overview]
Message-ID: <20100820.150336.619446192412742106.imp@bsdimp.com> (raw)
In-Reply-To: <AANLkTi=WiHd06=e4d_WdCe+HMfFhj-Q=xRS_4f-TzGUs-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
In message: <AANLkTi=WiHd06=e4d_WdCe+HMfFhj-Q=xRS_4f-TzGUs-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org> writes:
: Regardless though, the linux mapping doesn't actually have any bearing
: on the device tree because the mapping from HW to linux irq number is
: all internal to the kernel. The kernel could choose to start the
: mapping at 42 or somewhere else and it would all still work.
Some (all?) PowerPC platforms start their interrupt numbering at 16,
since interrupts 0-15 are reserved for old-school ISA interrupts from
the Super I/O chip that may (or may not) be present on these systems.
It's all handled inside the kernel, so is invisible to the
device-tree, as Grant is saying. Also, more OSes than Linux use
device trees, so hard-coding Linux IRQ numbers would be displeasing
from that point of view.
Just to give one concrete example.
Warner
next prev parent reply other threads:[~2010-08-20 21:03 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-18 18:59 [RFC PATCH 00/14] Versatile Express device tree port Lorenzo Pieralisi
[not found] ` <1282158000-23081-1-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 01/14] ARM: amba device memory allocation fix Lorenzo Pieralisi
[not found] ` <1282158000-23081-2-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 02/14] ARM: vexpress: fix clocks definition to comply with new framework Lorenzo Pieralisi
[not found] ` <1282158000-23081-3-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 03/14] ARM: fix add instruction to set the flags Lorenzo Pieralisi
[not found] ` <1282158000-23081-4-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 04/14] ARM: r1 DT mach id init Lorenzo Pieralisi
[not found] ` <1282158000-23081-5-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 05/14] ARM: vexpress: fix typo in addruart Lorenzo Pieralisi
[not found] ` <1282158000-23081-6-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 06/14] platform: add function to initialize OF match table Lorenzo Pieralisi
[not found] ` <1282158000-23081-7-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 07/14] drivers/smsc911x: add DT support Lorenzo Pieralisi
[not found] ` <1282158000-23081-8-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 08/14] ARM: versatile-i2c driver DT port Lorenzo Pieralisi
[not found] ` <1282158000-23081-9-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 09/14] ARM: ARM flash " Lorenzo Pieralisi
[not found] ` <1282158000-23081-10-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 10/14] drivers/USB: isp1760 DT platform parsing and binding Lorenzo Pieralisi
[not found] ` <1282158000-23081-11-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 11/14] ARM: PMU: add device tree probing Lorenzo Pieralisi
[not found] ` <1282158000-23081-12-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 12/14] ARM: vexpress: add board support for DT probing Lorenzo Pieralisi
[not found] ` <1282158000-23081-13-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 18:59 ` [RFC PATCH 13/14] ARM: vexpress: Definition of vexpress dts specification Lorenzo Pieralisi
[not found] ` <1282158000-23081-14-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 19:00 ` [RFC PATCH 14/14] ARM: vexpress: add device tree build system and dtbuImage Lorenzo Pieralisi
[not found] ` <1282158000-23081-15-git-send-email-lorenzo.pieralisi-5wv7dgnIgG8@public.gmane.org>
2010-08-18 22:03 ` Grant Likely
2010-08-18 21:55 ` [RFC PATCH 13/14] ARM: vexpress: Definition of vexpress dts specification Grant Likely
[not found] ` <AANLkTimb1vgf1v3TQKsBFBPGrxr9iPpKY3Z6fzfAEPgZ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-20 17:51 ` Lorenzo Pieralisi
[not found] ` <977313260285850582@unknownmsgid>
2010-08-20 20:32 ` Grant Likely
[not found] ` <AANLkTi=WiHd06=e4d_WdCe+HMfFhj-Q=xRS_4f-TzGUs-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-20 21:03 ` M. Warner Losh [this message]
[not found] ` <20100820.150336.619446192412742106.imp-uzTCJ5RojNnQT0dZR+AlfA@public.gmane.org>
2010-08-20 21:37 ` Grant Likely
2010-08-23 15:47 ` Lorenzo Pieralisi
[not found] ` <1086814508538526416@unknownmsgid>
2010-08-25 8:24 ` Grant Likely
2010-08-18 22:30 ` [RFC PATCH 12/14] ARM: vexpress: add board support for DT probing Grant Likely
2010-08-18 23:56 ` Mitch Bradley
[not found] ` <4C6C7310.1070103-D5eQfiDGL7eakBO8gow8eQ@public.gmane.org>
2010-08-19 0:03 ` Grant Likely
2010-08-18 21:36 ` [RFC PATCH 11/14] ARM: PMU: add device tree probing Grant Likely
[not found] ` <AANLkTinz2CWrzPk3BtM6tWxu1udeAS1LFzjACB9spq-y-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-20 10:56 ` Lorenzo Pieralisi
[not found] ` <-4778531030339335058@unknownmsgid>
2010-08-25 7:39 ` Grant Likely
2010-08-18 21:27 ` [RFC PATCH 10/14] drivers/USB: isp1760 DT platform parsing and binding Grant Likely
2010-08-18 21:22 ` [RFC PATCH 09/14] ARM: ARM flash driver DT port Grant Likely
[not found] ` <AANLkTik2gPYrP+xh-jhFLWjVbr8dwCuCMnVXXvYP56e4-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2010-08-20 10:29 ` Catalin Marinas
[not found] ` <1282300189.3888.4.camel-uqmqopRKlSLZROr8t4l/smS4ubULX0JqMm0uRHvK7Nw@public.gmane.org>
2010-08-25 7:40 ` Grant Likely
2010-08-18 21:17 ` [RFC PATCH 08/14] ARM: versatile-i2c " Grant Likely
2010-08-18 21:17 ` [RFC PATCH 07/14] drivers/smsc911x: add DT support Grant Likely
2010-08-19 0:30 ` Grant Likely
2010-08-20 10:24 ` Lorenzo Pieralisi
[not found] ` <-4137939526196482437@unknownmsgid>
2010-08-20 21:14 ` Grant Likely
2010-08-18 20:58 ` [RFC PATCH 05/14] ARM: vexpress: fix typo in addruart Grant Likely
2010-08-18 20:56 ` [RFC PATCH 04/14] ARM: r1 DT mach id init Grant Likely
2010-08-18 19:26 ` [RFC PATCH 03/14] ARM: fix add instruction to set the flags Grant Likely
2010-08-18 19:25 ` [RFC PATCH 02/14] ARM: vexpress: fix clocks definition to comply with new framework Grant Likely
2010-08-18 19:24 ` [RFC PATCH 01/14] ARM: amba device memory allocation fix Grant Likely
2010-08-18 19:14 ` [RFC PATCH 00/14] Versatile Express device tree port Grant Likely
2010-08-19 2:45 ` Jeremy Kerr
2010-08-23 8:49 ` Jeremy Kerr
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