gpio: add GPIO support for F71882FG and F71889F
This patch adds support for the GPIOs found on the Fintek super-I/O
chips F71882FG and F71889F.
A super-I/O is a legacy I/O controller embedded on x86 motherboards. It
is used to connect the low-bandwidth devices. Among others functions the
F71882FG/F71889F provides: a parallel port, two serial ports, a keyboard
controller, an hardware monitoring controller and some GPIO pins.
Note that this super-I/Os are embedded on some Atom-based LaCie NASes.
The GPIOs are used to control the LEDs and the hard drive power.
Changes since v3:
- Use request_muxed_region to protect the I/O ports against concurrent
accesses.
Changes since v2:
- Remove useless NULL setters for driver data.
Changes since v1:
- Enhance the commit message by describing what is a Super-I/O.
- Use self-explanatory names for the GPIO register macros.
- Add a comment to explain the platform device and driver registration.
- Fix gpio_get when GPIO is configured in input mode. I only had
the hardware to check this mode recently...
Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 4b7ba53..349b161 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -146,6 +146,16 @@
(EBU) found on Lantiq SoCs. The gpios are output only as they are
created by attaching a 16bit latch to the bus.
+config GPIO_F7188X
+ tristate "F71882FG and F71889F GPIO support"
+ depends on X86
+ help
+ This option enables support for GPIOs found on Fintek Super-I/O
+ chips F71882FG and F71889F.
+
+ To compile this driver as a module, choose M here: the module will
+ be called f7188x-gpio.
+
config GPIO_MPC5200
def_bool y
depends on PPC_MPC52xx