From: William Breathitt Gray <vilhelm.gray-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: gregkh-hQyY1W1yCW8ekmWlsbkhG0B+6BGkLq7r@public.gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org
Cc: x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
linux-next-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-gpio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-iio-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-watchdog-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
sfr-3FnU+UHB4dNDw9hX6IcOSA@public.gmane.org,
William Breathitt Gray
<vilhelm.gray-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Subject: [PATCH v3 0/4] Allow ISA-style drivers on modern systems
Date: Mon, 23 May 2016 19:13:19 -0400 [thread overview]
Message-ID: <cover.1464044853.git.vilhelm.gray@gmail.com> (raw)
Changes in v3:
- Remove redundant X86 dependency from the X86 ISA_BUS Kconfig option
Changes in v2:
- Adjusted preprocessor compilation conditional in include/linux/isa.h
to use CONFIG_ISA_BUS_API in order to link the correct ISA bus
driver function definitions when available
- Move ISA_BUS_API Kconfig option to arch/Kconfig, thus making it
available to all architectures instead of just X86
- X86 ISA_BUS Kconfig option should be disabled by default; ISA
devices typically do not have a way to be probed, so users should
be required to explicitly enable ISA bus driver support, lest a
selected driver be loaded with the misguided expectation of a safe
hardware probe
Several modern devices, such as PC/104 cards, are expected to run on
modern systems via an ISA bus interface. Since ISA is a legacy interface
for most modern architectures, ISA support should remain disabled in
general. Support for ISA-style drivers should be enabled on a per driver
basis.
To allow ISA-style drivers on modern systems, this patchset introduces
the ISA_BUS_API and ISA_BUS Kconfig options. The ISA bus driver will now
build conditionally on the ISA_BUS_API Kconfig option, which defaults to
the legacy ISA Kconfig option. The ISA_BUS Kconfig option allows the
ISA_BUS_API Kconfig option to be selected on architectures which do not
enable ISA (e.g. X86_64).
The ISA_BUS Kconfig option is currently only implemented for X86
architectures. Other architectures may have their own ISA_BUS Kconfig
option added as required.
An earlier attempt to allow the ISA bus driver to build for X86_64 took
an inappropriate approach resulting in legacy ISA drivers becoming
enabled unconditionally on untested and unsupported architectures.
Commit 51e68d055cba ("x86 isa: add back X86_32 dependency on
CONFIG_ISA"), added to restrict the ISA bus driver to only X86_32,
causes several drivers intended for X86_64 to be restricted to X86_32 as
well.
This patchset replaces the ISA Kconfig option dependency of several
drivers to ISA_BUS_API, so that they may build for X86_64 as intended.
The respective drivers are as follows:
* ACCES 104-IDIO-16 GPIO driver
* ACCES 104-IDI-48 GPIO driver
* ACCES 104-DIO-48E GPIO driver
* Apex Embedded Systems STX104 DAC driver
* WinSystems EBC-C384 watchdog timer driver
* WinSystems WS16C48 GPIO driver
William Breathitt Gray (4):
isa: Allow ISA-style drivers on modern systems
gpio: Allow PC/104 devices on X86_64
iio: stx104: Allow build for X86_64
watchdog: ebc-c384_wdt: Allow build for X86_64
arch/Kconfig | 3 +++
arch/x86/Kconfig | 10 ++++++++++
drivers/base/Makefile | 2 +-
drivers/gpio/Kconfig | 8 ++++----
drivers/iio/dac/Kconfig | 2 +-
drivers/watchdog/Kconfig | 2 +-
include/linux/isa.h | 2 +-
7 files changed, 21 insertions(+), 8 deletions(-)
--
2.7.3
next reply other threads:[~2016-05-23 23:13 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-23 23:13 William Breathitt Gray [this message]
2016-05-23 23:13 ` [PATCH v3 1/4] isa: Allow ISA-style drivers on modern systems William Breathitt Gray
2016-05-23 23:54 ` Guenter Roeck
2016-05-23 23:13 ` [PATCH v3 2/4] gpio: Allow PC/104 devices on X86_64 William Breathitt Gray
2016-05-23 23:14 ` [PATCH v3 3/4] iio: stx104: Allow build for X86_64 William Breathitt Gray
2016-05-23 23:14 ` [PATCH v3 4/4] watchdog: ebc-c384_wdt: " William Breathitt Gray
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