gpiolib: allow user-selection

This patch adds functionality to the gpio-lib subsystem to make it
possible to enable the gpio-lib code even if the architecture code didn't
request to get it built in.

The archtitecture code does still need to implement the gpiolib accessor
functions in its asm/gpio.h file.  This patch adds the implementations for
x86 and PPC.

With these changes it is possible to run generic GPIO expansion cards on
every architecture that implements the trivial wrapper functions.  Support
for more architectures can easily be added.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: David Brownell <david-b@pacbell.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jean Delvare <khali@linux-fr.org>
Cc: Samuel Ortiz <sameo@openedhand.com>
Cc: Kumar Gala <galak@gate.crashing.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

7 files changed, 10 insertions, 8 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 6fb4f03369f2..dabb015aa40b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -268,7 +268,7 @@ config ARCH_EP93XX
         select GENERIC_GPIO
         select HAVE_CLK
         select HAVE_CLK
-        select HAVE_GPIO_LIB
+        select ARCH_REQUIRE_GPIOLIB
         help
           This enables support for the Cirrus EP93xx series of CPUs.
 
@@ -447,7 +447,7 @@ config ARCH_PXA
         select ARCH_MTD_XIP
         select GENERIC_GPIO
         select HAVE_CLK
-        select HAVE_GPIO_LIB
+        select ARCH_REQUIRE_GPIOLIB
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
         select TICK_ONESHOT
@@ -479,7 +479,7 @@ config ARCH_SA1100
         select GENERIC_CLOCKEVENTS
         select HAVE_CLK
         select TICK_ONESHOT
-        select HAVE_GPIO_LIB
+        select ARCH_REQUIRE_GPIOLIB
         help
           Support for StrongARM 11x0 based boards.
 
@@ -522,7 +522,7 @@ config ARCH_OMAP
         bool "TI OMAP"
         select GENERIC_GPIO
         select HAVE_CLK
-        select HAVE_GPIO_LIB
+        select ARCH_REQUIRE_GPIOLIB
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
         help
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index df4adefedb42..7c239a916275 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -88,7 +88,7 @@ config PLATFORM_AT32AP
         select SUBARCH_AVR32B
         select MMU
         select PERFORMANCE_COUNTERS
-        select HAVE_GPIO_LIB
+        select ARCH_REQUIRE_GPIOLIB
         select GENERIC_ALLOCATOR
 
 #
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index b9c754f4070c..b4c4eaa5dd26 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -713,7 +713,7 @@ config CSRC_SB1250
 
 config GPIO_TXX9
         select GENERIC_GPIO
-        select HAVE_GPIO_LIB
+        select ARCH_REQUIRE_GPIOLIB
         bool
 
 config CFE
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index de6b49cd6be8..fe88418167c5 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -110,6 +110,7 @@ config PPC
         default y
         select HAVE_DYNAMIC_FTRACE
         select HAVE_FTRACE
+        select ARCH_WANT_OPTIONAL_GPIOLIB
         select HAVE_IDE
         select HAVE_IOREMAP_PROT
         select HAVE_EFFICIENT_UNALIGNED_ACCESS
diff --git a/arch/powerpc/platforms/52xx/Kconfig b/arch/powerpc/platforms/52xx/Kconfig
index d664b1bce381..ccbd4958412e 100644
--- a/arch/powerpc/platforms/52xx/Kconfig
+++ b/arch/powerpc/platforms/52xx/Kconfig
@@ -48,6 +48,6 @@ config PPC_MPC5200_BUGFIX
 config PPC_MPC5200_GPIO
         bool "MPC5200 GPIO support"
         depends on PPC_MPC52xx
-        select HAVE_GPIO_LIB
+        select ARCH_REQUIRE_GPIOLIB
         help
           Enable gpiolib support for mpc5200 based boards
diff --git a/arch/powerpc/sysdev/qe_lib/Kconfig b/arch/powerpc/sysdev/qe_lib/Kconfig
index 4bb18f57901e..1ce546462be5 100644
--- a/arch/powerpc/sysdev/qe_lib/Kconfig
+++ b/arch/powerpc/sysdev/qe_lib/Kconfig
@@ -29,7 +29,7 @@ config QE_GPIO
         bool "QE GPIO support"
         depends on QUICC_ENGINE
         select GENERIC_GPIO
-        select HAVE_GPIO_LIB
+        select ARCH_REQUIRE_GPIOLIB
         help
           Say Y here if you're going to use hardware that connects to the
           QE GPIOs.
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 66f3ab05b18c..e3cba0b45600 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -23,6 +23,7 @@ config X86
         select HAVE_OPROFILE
         select HAVE_IOREMAP_PROT
         select HAVE_KPROBES
+        select ARCH_WANT_OPTIONAL_GPIOLIB if !X86_RDC321X
         select HAVE_KRETPROBES
         select HAVE_DYNAMIC_FTRACE
         select HAVE_FTRACE