lirc: added support for RaspberryPi GPIO

lirc_rpi: Use read_current_timer to determine transmitter delay. Thanks to jjmz and others
See: raspberrypi/linux#525

lirc: Remove restriction on gpio pins that can be used with lirc

Compute Module, for example could use different pins

lirc_rpi: Add parameter to specify input pin pull

Depending on the connected IR circuitry it might be desirable to change the
gpios internal pull from it pull-down default behaviour. Add a module
parameter to allow the user to set it explicitly.

Signed-off-by: Julian Scheel <julian@jusst.de>

lirc-rpi: Use the higher-level irq control functions

This module used to access the irq_chip methods of the
gpio controller directly, rather than going through the
standard enable_irq/irq_set_irq_type functions. This
caused problems on pinctrl-bcm2835 which only implements
the irq_enable/disable methods and not irq_unmask/mask.

lirc-rpi: Correct the interrupt usage

1) Correct the use of enable_irq (i.e. don't call it so often)
2) Correct the shutdown sequence.
3) Avoid a bcm2708_gpio driver quirk by setting the irq flags earlier

lirc-rpi: use getnstimeofday instead of read_current_timer

read_current_timer isn't guaranteed to return values in
microseconds, and indeed it doesn't on a Pi2.

Issue: linux#827

lirc-rpi: Add device tree support, and a suitable overlay

The overlay supports DT parameters that match the old module
parameters, except that gpio_in_pull should be set using the
strings "up", "down" or "off".

lirc-rpi: Also support pinctrl-bcm2835 in non-DT mode

drivers/staging/media/lirc/Kconfig

@@ -32,6 +32,12 @@ config LIRC_PARALLEL
 	help
 	  Driver for Homebrew Parallel Port Receivers
 
+config LIRC_RPI
+	tristate "Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi"
+	depends on LIRC
+	help
+	  Driver for Homebrew GPIO Port Receiver/Transmitter for the RaspberryPi
+
 config LIRC_SASEM
 	tristate "Sasem USB IR Remote"
 	depends on LIRC && USB

drivers/staging/media/lirc/Makefile

@@ -6,6 +6,7 @@
 obj-$(CONFIG_LIRC_BT829)	+= lirc_bt829.o
 obj-$(CONFIG_LIRC_IMON)		+= lirc_imon.o
 obj-$(CONFIG_LIRC_PARALLEL)	+= lirc_parallel.o
+obj-$(CONFIG_LIRC_RPI)		+= lirc_rpi.o
 obj-$(CONFIG_LIRC_SASEM)	+= lirc_sasem.o
 obj-$(CONFIG_LIRC_SERIAL)	+= lirc_serial.o
 obj-$(CONFIG_LIRC_SIR)		+= lirc_sir.o