From: arnd@arndb.de (Arnd Bergmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] mfd: max8925: request resource region
Date: Mon, 7 May 2012 10:14:03 +0000 [thread overview]
Message-ID: <201205071014.03632.arnd@arndb.de> (raw)
In-Reply-To: <20120507094718.GD4415@opensource.wolfsonmicro.com>
On Monday 07 May 2012, Mark Brown wrote:
> > What if you have two devices both claiming IO regions at 0? Hint: it
> > fails.
>
> Don't think I've got any examples with regions beginning at 0 but other
> regions seem to not run into any problems with overlap. Note that all
> these drivers do with the regions is use them to look up the base
> register.
ISA devices start at 0. Using a definition for IORESOURCE_IO of "PCI
port number for relatively large values, but either ISA or PCMCIA or
an arbitrary MFD for relatively small values" is absolutely crazy.
FWIW, there are resources you define in include/linux/mfd/wm831x/core.h
that have values between 0x4000 and 0x8000, which is exactly the
range occupied by PCI devices on my thinkpad. It's only a matter of
time until someone puts conflicting devices into one machine.
Arnd
next prev parent reply other threads:[~2012-05-07 10:14 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-07 3:10 [PATCH 1/2] mfd: max8925: request resource region Haojian Zhuang
2012-05-07 3:10 ` [PATCH 2/2] ARM: mmp: add io head file Haojian Zhuang
2012-05-07 9:23 ` Arnd Bergmann
2012-05-07 7:58 ` [PATCH 1/2] mfd: max8925: request resource region Russell King - ARM Linux
2012-05-07 8:18 ` Haojian Zhuang
2012-05-07 8:59 ` Russell King - ARM Linux
2012-05-07 9:01 ` Mark Brown
2012-05-07 9:08 ` Russell King - ARM Linux
2012-05-07 9:47 ` Mark Brown
2012-05-07 10:14 ` Arnd Bergmann [this message]
2012-05-07 10:23 ` Haojian Zhuang
2012-05-07 11:21 ` Arnd Bergmann
2012-05-07 11:29 ` Mark Brown
[not found] ` <201205071319.48768.arnd@arndb.de>
2012-05-07 14:02 ` Samuel Ortiz
2012-05-07 14:15 ` Mark Brown
2012-05-07 15:15 ` Arnd Bergmann
2012-05-07 15:28 ` Mark Brown
2012-05-07 10:37 ` Mark Brown
[not found] ` <201205071314.51886.arnd@arndb.de>
2012-05-07 14:06 ` Mark Brown
2012-05-07 15:09 ` Arnd Bergmann
2012-05-07 15:17 ` Mark Brown
2012-05-07 19:26 ` Arnd Bergmann
2012-05-07 19:58 ` Mark Brown
2012-05-08 8:17 ` Mark Brown
2012-05-08 14:44 ` Arnd Bergmann
2012-05-08 15:31 ` Mark Brown
2012-05-09 12:43 ` Arnd Bergmann
2012-05-09 14:13 ` Mark Brown
2012-05-09 14:19 ` Arnd Bergmann
2012-05-09 14:42 ` Mark Brown
2012-05-09 15:03 ` Arnd Bergmann
2012-05-09 15:28 ` Mark Brown
2012-05-09 16:27 ` Arnd Bergmann
2012-05-09 16:18 ` Russell King - ARM Linux
2012-05-09 16:30 ` Mark Brown
2012-05-09 16:07 ` Russell King - ARM Linux
2012-05-09 16:26 ` Arnd Bergmann
2012-05-09 16:27 ` Russell King - ARM Linux
2012-05-07 18:57 ` Russell King - ARM Linux
2012-05-07 19:27 ` Mark Brown
2012-05-07 8:12 ` Samuel Ortiz
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