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authorSteven King <sfking@fdwdc.com>2012-05-21 13:10:19 -0700
committerGreg Ungerer <gerg@uclinux.org>2012-07-16 09:59:21 +1000
commiteac57949947fa24f47a2e993a1dbbfdb573b4301 (patch)
tree7ef7fadfbbb7153c788dbc036445ed1f74012f28 /arch/m68k/Kconfig.cpu
parent14be4252eae2ce40abec5872bf6011891d753433 (diff)
m68knommu: refactor Coldfire GPIO not to require GPIOLIB, eliminate mcf_gpio_chips.
If we're not connecting external GPIO extenders via i2c or spi or whatever, we probably don't need GPIOLIB. If we provide an alternate implementation of the GPIOLIB functions to use when only on-chip GPIO is needed, we can change ARCH_REQUIRE_GPIOLIB to ARCH_WANTS_OPTIONAL_GPIOLIB so that GPIOLIB becomes optional. The downside is that in the GPIOLIB=n case, we lose all error checking done by gpiolib, ie multiply allocating the gpio, free'ing gpio etc., so that the only checking that can be done is if we reference a gpio on an external part. Targets that need the extra error checking can still select GPIOLIB=y. For the case where GPIOLIB=y, we can simplify the table of gpio chips to use a single chip, eliminating the tables of chips in the 5xxx.c files. The original motivation for the definition of multiple chips was to match the way many of the Coldfire variants defined their gpio as a spare array in memory. However, all this really gains us is some error checking when we request a gpio, gpiolib can check that it doesn't fall in one of the holes. If thats important, I think we can still come up with a better way of accomplishing that. Also in this patch is some general cleanup and reorganizing of the gpio header files (I'm sure I must have had a reason why I sometimes used a prefix of mcf_gpio and other times mcfgpio but for the life of me I can't think of it now). Signed-off-by: Steven King <sfking@fdwdc.com> Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Diffstat (limited to 'arch/m68k/Kconfig.cpu')
-rw-r--r--arch/m68k/Kconfig.cpu2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
index 2b53254ad994..ff2314d5d934 100644
--- a/arch/m68k/Kconfig.cpu
+++ b/arch/m68k/Kconfig.cpu
@@ -23,7 +23,7 @@ config M68KCLASSIC
config COLDFIRE
bool "Coldfire CPU family support"
select GENERIC_GPIO
- select ARCH_REQUIRE_GPIOLIB
+ select ARCH_WANT_OPTIONAL_GPIOLIB
select ARCH_HAVE_CUSTOM_GPIO_H
select CPU_HAS_NO_BITFIELDS
select CPU_HAS_NO_MULDIV64