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authoreric miao <eric.miao@marvell.com>2008-02-04 22:28:26 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 09:44:13 -0800
commit9e60fdcf0c2905d7a8fc4cb2b3711ea5c5acaae1 (patch)
treec90417ab0e2079d0355ffb553985d9a0f2348bab /drivers/gpio/Kconfig
parente58b9e2762a6ef99e20dba47aba21b911658541d (diff)
downloadlinux-9e60fdcf0c2905d7a8fc4cb2b3711ea5c5acaae1.tar.bz2
gpiolib: pca9539 i2c gpio expander support
This adds a new-style I2C driver with basic support for the sixteen bit PCA9539 GPIO expanders. These chips have multiple registers, push-pull output drivers, and (not supported in this patch) pin change interrupts. Board-specific code must provide "pca9539_platform_data" with each chip's "i2c_board_info". That provides the GPIO numbers to be used by that chip, and callbacks for board-specific setup/teardown logic. Derived from drivers/i2c/chips/pca9539.c (which has no current known users). This is faster and simpler; it uses 16-bit register access, and cache the OUTPUT and DIRECTION registers for fast access Signed-off-by: eric miao <eric.miao@marvell.com> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Jean Delvare <khali@linux-fr.org> Cc: Sam Ravnborg <sam@ravnborg.org> Cc: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Philipp Zabel <philipp.zabel@gmail.com> Cc: Russell King <rmk@arm.linux.org.uk> Cc: Ben Gardner <bgardner@wabtec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/gpio/Kconfig')
-rw-r--r--drivers/gpio/Kconfig10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index d924a32c089a..74fac0f5c348 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -27,6 +27,16 @@ config DEBUG_GPIO
comment "I2C GPIO expanders:"
+config GPIO_PCA9539
+ tristate "PCA9539 16-bit I/O port"
+ depends on I2C
+ help
+ Say yes here to support the PCA9539 16-bit I/O port. These
+ parts are made by NXP and TI.
+
+ This driver can also be built as a module. If so, the module
+ will be called pca9539.
+
config GPIO_PCF857X
tristate "PCF857x, PCA857x, and PCA967x I2C GPIO expanders"
depends on I2C