From: Arnd Bergmann <arnd@arndb.de>
To: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Dave Jones <davej@redhat.com>,
Mark Brown <broonie@opensource.wolfsonmicro.com>,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
Tony Lindgren <tony@atomide.com>,
Linus Walleij <linus.walleij@linaro.org>,
cpufreq@vger.kernel.org, "Rafael J. Wysocki" <rjw@sisk.pl>,
linux-arm-kernel@lists.infradead.org
Subject: Re: Status of arch/arm in linux-next
Date: Tue, 26 Apr 2011 16:05:26 +0200 [thread overview]
Message-ID: <201104261605.26791.arnd@arndb.de> (raw)
In-Reply-To: <alpine.LFD.2.00.1104211629300.24613@xanadu.home>
On Thursday 21 April 2011, Nicolas Pitre wrote:
> > if there's commonality between some of the ARM arch drivers, why can't
> > there be a arch/arm/cpufreq/ dir for the shared code, and do everything there ?
>
> Because usually there isn't. "ARM" is just a CPU architecture, not a
> system architecture. Everything around the core is different from one
> vendor to the next. And when commonality exists it is much easier to
> deal with if it is close together.
Exactly. To make matters worse, we are starting to see a number of vendors
that use multiple CPU architectures with the same I/O devices (e.g. Renesas,
Freescale, Xilinx, TI, ...). Not sure if any of these use the same cpufreq
register on more than one architecture, but it's quite likely to happen
at some point.
Arnd
WARNING: multiple messages have this Message-ID (diff)
From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: Status of arch/arm in linux-next
Date: Tue, 26 Apr 2011 16:05:26 +0200 [thread overview]
Message-ID: <201104261605.26791.arnd@arndb.de> (raw)
In-Reply-To: <alpine.LFD.2.00.1104211629300.24613@xanadu.home>
On Thursday 21 April 2011, Nicolas Pitre wrote:
> > if there's commonality between some of the ARM arch drivers, why can't
> > there be a arch/arm/cpufreq/ dir for the shared code, and do everything there ?
>
> Because usually there isn't. "ARM" is just a CPU architecture, not a
> system architecture. Everything around the core is different from one
> vendor to the next. And when commonality exists it is much easier to
> deal with if it is close together.
Exactly. To make matters worse, we are starting to see a number of vendors
that use multiple CPU architectures with the same I/O devices (e.g. Renesas,
Freescale, Xilinx, TI, ...). Not sure if any of these use the same cpufreq
register on more than one architecture, but it's quite likely to happen
at some point.
Arnd
next prev parent reply other threads:[~2011-04-26 14:05 UTC|newest]
Thread overview: 85+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-14 9:44 Status of arch/arm in linux-next Russell King - ARM Linux
2011-04-14 11:08 ` Tony Lindgren
2011-04-14 12:02 ` Russell King - ARM Linux
2011-04-14 12:31 ` Tony Lindgren
2011-04-14 14:20 ` Mark Brown
2011-04-14 14:26 ` Tony Lindgren
2011-04-14 14:31 ` Russell King - ARM Linux
2011-04-14 18:32 ` Mark Brown
2011-04-15 15:12 ` Grant Likely
2011-04-15 15:56 ` Russell King - ARM Linux
2011-04-15 16:10 ` Grant Likely
2011-04-16 8:28 ` Russell King - ARM Linux
2011-04-16 16:57 ` Mark Brown
2011-04-18 8:10 ` Tony Lindgren
2011-04-18 13:57 ` Mark Brown
2011-04-18 14:41 ` Tony Lindgren
2011-04-18 14:41 ` Tony Lindgren
2011-04-18 15:58 ` Mark Brown
2011-04-18 15:58 ` Mark Brown
2011-04-18 17:18 ` Russell King - ARM Linux
2011-04-18 20:23 ` Mark Brown
2011-04-18 21:40 ` Thomas Gleixner
2011-04-18 23:55 ` Mark Brown
2011-04-14 14:07 ` Mark Brown
2011-04-15 2:59 ` Nico Erfurth
2011-04-15 8:21 ` Nicolas Ferre
2011-04-15 13:13 ` Nico Erfurth
2011-04-15 1:16 ` Linus Walleij
2011-04-15 6:26 ` Tony Lindgren
2011-04-19 14:16 ` Arnd Bergmann
2011-04-19 14:50 ` Mark Brown
2011-04-19 14:55 ` Arnd Bergmann
2011-04-19 15:04 ` Mark Brown
2011-04-19 15:14 ` Linus Walleij
2011-04-19 16:01 ` Arnd Bergmann
2011-04-19 16:01 ` Arnd Bergmann
2011-04-19 16:05 ` Mark Brown
2011-04-19 16:05 ` Mark Brown
2011-04-21 20:14 ` Dave Jones
2011-04-21 20:14 ` Dave Jones
2011-04-21 21:02 ` Nicolas Pitre
2011-04-21 21:02 ` Nicolas Pitre
2011-04-22 7:17 ` Tony Lindgren
2011-04-22 7:17 ` Tony Lindgren
2011-04-26 14:05 ` Arnd Bergmann [this message]
2011-04-26 14:05 ` Arnd Bergmann
2011-04-26 17:04 ` Rafael J. Wysocki
2011-04-26 17:04 ` Rafael J. Wysocki
2011-04-26 18:15 ` Dave Jones
2011-04-26 18:15 ` Dave Jones
2011-04-29 20:15 ` Dave Jones
2011-04-29 20:15 ` Dave Jones
2011-04-30 0:05 ` Nicolas Pitre
2011-04-30 0:05 ` Nicolas Pitre
2011-08-13 15:46 ` [BUG?] Moving drivers to drivers/cpufreq/ causes all to be loaded Jonathan Nieder
2011-08-13 19:02 ` Jonathan Nieder
2011-08-13 21:11 ` Dave Jones
2011-08-14 0:18 ` Mattia Dongili
2011-08-14 0:18 ` Mattia Dongili
2011-08-14 17:01 ` Jonathan Nieder
2011-08-14 17:17 ` Kay Sievers
2011-08-14 17:17 ` Kay Sievers
2011-05-01 23:02 ` Status of arch/arm in linux-next Jamie Lokier
2011-05-01 23:02 ` Jamie Lokier
2011-04-19 16:27 ` Dave Jones
2011-04-19 16:27 ` Dave Jones
2011-04-19 17:12 ` Arnd Bergmann
2011-04-19 17:12 ` Arnd Bergmann
2011-04-20 6:36 ` Linus Walleij
2011-04-20 6:36 ` Linus Walleij
2011-04-21 7:32 ` Linus Walleij
2011-04-21 8:25 ` Arnd Bergmann
2011-04-22 7:56 ` Linus Walleij
2011-04-22 11:46 ` Linus Walleij
2011-05-02 13:49 ` Samuel Ortiz
2011-05-02 19:21 ` Linus Walleij
2011-04-20 7:33 ` Tony Lindgren
2011-04-20 7:43 ` Arnd Bergmann
2011-04-15 14:30 ` Martin Guy
2011-04-15 15:50 ` Russell King - ARM Linux
2011-04-18 15:17 ` Alexey Zaytsev
2011-04-18 16:23 ` Linus Torvalds
2011-04-18 21:54 ` Alexey Zaytsev
2011-04-19 15:02 ` Linus Torvalds
2011-04-19 15:20 ` Jean-Christophe PLAGNIOL-VILLARD
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