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authorMichael Buesch <mb@bu3sch.de>2008-07-25 12:46:11 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 21:53:30 +0400
commit7444a72effa632fcd8edc566f880d96fe213c73b (patch)
tree89d3e70c22751a6b00091df2b4dce7202eb3b1f5 /drivers
parentff1d5c2f0268f4e32103536e2e65480b5b7b6530 (diff)
downloadlinux-7444a72effa632fcd8edc566f880d96fe213c73b.tar.xz
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/Makefile2
-rw-r--r--drivers/gpio/Kconfig33
-rw-r--r--drivers/gpio/Makefile2
-rw-r--r--drivers/i2c/chips/Kconfig2
-rw-r--r--drivers/mfd/Kconfig4
-rw-r--r--drivers/of/Kconfig2
6 files changed, 35 insertions, 10 deletions
diff --git a/drivers/Makefile b/drivers/Makefile
index 808e0ae66aa8..54ec5e718c0e 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -5,7 +5,7 @@
# Rewritten to use lists instead of if-statements.
#
-obj-$(CONFIG_HAVE_GPIO_LIB) += gpio/
+obj-y += gpio/
obj-$(CONFIG_PCI) += pci/
obj-$(CONFIG_PARISC) += parisc/
obj-$(CONFIG_RAPIDIO) += rapidio/
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index de202dbe5300..5a355f829167 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -2,15 +2,40 @@
# GPIO infrastructure and expanders
#
-config HAVE_GPIO_LIB
+config ARCH_WANT_OPTIONAL_GPIOLIB
bool
help
+ Select this config option from the architecture Kconfig, if
+ it is possible to use gpiolib on the architecture, but let the
+ user decide whether to actually build it or not.
+ Select this instead of ARCH_REQUIRE_GPIOLIB, if your architecture does
+ not depend on GPIOs being available, but rather let the user
+ decide whether he needs it or not.
+
+config ARCH_REQUIRE_GPIOLIB
+ bool
+ select GPIOLIB
+ help
Platforms select gpiolib if they use this infrastructure
for all their GPIOs, usually starting with ones integrated
into SOC processors.
+ Selecting this from the architecture code will cause the gpiolib
+ code to always get built in.
+
+
+
+menuconfig GPIOLIB
+ bool "GPIO Support"
+ depends on ARCH_WANT_OPTIONAL_GPIOLIB || ARCH_REQUIRE_GPIOLIB
+ select GENERIC_GPIO
+ help
+ This enables GPIO support through the generic GPIO library.
+ You only need to enable this, if you also want to enable
+ one or more of the GPIO expansion card drivers below.
+
+ If unsure, say N.
-menu "GPIO Support"
- depends on HAVE_GPIO_LIB
+if GPIOLIB
config DEBUG_GPIO
bool "Debug GPIO calls"
@@ -116,4 +141,4 @@ config GPIO_MCP23S08
SPI driver for Microchip MCP23S08 I/O expander. This provides
a GPIO interface supporting inputs and outputs.
-endmenu
+endif
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index eeb2f2b20282..8c45948d1fe7 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -2,7 +2,7 @@
ccflags-$(CONFIG_DEBUG_GPIO) += -DDEBUG
-obj-$(CONFIG_HAVE_GPIO_LIB) += gpiolib.o
+obj-$(CONFIG_GPIOLIB) += gpiolib.o
obj-$(CONFIG_GPIO_MAX7301) += max7301.o
obj-$(CONFIG_GPIO_MCP23S08) += mcp23s08.o
diff --git a/drivers/i2c/chips/Kconfig b/drivers/i2c/chips/Kconfig
index 50e0a4653741..a95cb9465d65 100644
--- a/drivers/i2c/chips/Kconfig
+++ b/drivers/i2c/chips/Kconfig
@@ -126,7 +126,7 @@ config ISP1301_OMAP
config TPS65010
tristate "TPS6501x Power Management chips"
- depends on HAVE_GPIO_LIB
+ depends on GPIOLIB
default y if MACH_OMAP_H2 || MACH_OMAP_H3 || MACH_OMAP_OSK
help
If you say yes here you get support for the TPS6501x series of
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index bac9e973ece0..1f57a99fd968 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -36,7 +36,7 @@ config MFD_ASIC3
config HTC_EGPIO
bool "HTC EGPIO support"
- depends on GENERIC_HARDIRQS && HAVE_GPIO_LIB && ARM
+ depends on GENERIC_HARDIRQS && GPIOLIB && ARM
help
This driver supports the CPLD egpio chip present on
several HTC phones. It provides basic support for input
@@ -52,7 +52,7 @@ config HTC_PASIC3
config MFD_TC6393XB
bool "Support Toshiba TC6393XB"
- depends on HAVE_GPIO_LIB
+ depends on GPIOLIB
select MFD_CORE
help
Support for Toshiba Mobile IO Controller TC6393XB
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 3a7a11a75fb4..1d7ec3129349 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -4,7 +4,7 @@ config OF_DEVICE
config OF_GPIO
def_bool y
- depends on OF && PPC_OF && HAVE_GPIO_LIB
+ depends on OF && PPC_OF && GPIOLIB
help
OpenFirmware GPIO accessors