CAN: Add Flexcan CAN controller driver

This core is found on some Freescale SoCs and also some Coldfire
SoCs. Support for Coldfire is missing though at the moment as
they have an older revision of the core which does not have RX FIFO
support.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/Kconfig

@@ -73,6 +73,15 @@ config CAN_JANZ_ICAN3
 	  This driver can also be built as a module. If so, the module will be
 	  called janz-ican3.ko.
 
+config HAVE_CAN_FLEXCAN
+	bool
+
+config CAN_FLEXCAN
+	tristate "Support for Freescale FLEXCAN based chips"
+	depends on CAN_DEV && HAVE_CAN_FLEXCAN
+	---help---
+	  Say Y here if you want to support for Freescale FlexCAN.
+
 source "drivers/net/can/mscan/Kconfig"
 
 source "drivers/net/can/sja1000/Kconfig"