gpio: max732x driver

This adds a driver supporting a family of I2C port expanders from Maxim,
which includes the MAX7319 and MAX7320-7327 chips.

[dbrownell@users.sourceforge.net: minor fixes]
Signed-off-by: Jack Ren <jack.ren@marvell.com>
Signed-off-by: Eric Miao <eric.miao@marvell.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 5a355f829167..dbd42d6c93a7 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -67,6 +67,25 @@ config GPIO_SYSFS
 
 comment "I2C GPIO expanders:"
 
+config GPIO_MAX732X
+        tristate "MAX7319, MAX7320-7327 I2C Port Expanders"
+        depends on I2C
+        help
+          Say yes here to support the MAX7319, MAX7320-7327 series of I2C
+          Port Expanders. Each IO port on these chips has a fixed role of
+          Input (designated by 'I'), Push-Pull Output ('O'), or Open-Drain
+          Input and Output (designed by 'P'). The combinations are listed
+          below:
+
+          8 bits:       max7319 (8I), max7320 (8O), max7321 (8P),
+                        max7322 (4I4O), max7323 (4P4O)
+
+          16 bits:      max7324 (8I8O), max7325 (8P8O),
+                        max7326 (4I12O), max7327 (4P12O)
+
+          Board setup code must specify the model to use, and the start
+          number for these GPIOs.
+
 config GPIO_PCA953X
         tristate "PCA953x, PCA955x, and MAX7310 I/O ports"
         depends on I2C