can: move SPI drivers into a separate directory

Create a directory for all CAN drivers using SPI and move mcp251x driver there.

Signed-off-by: Stefano Babic <[e-mail]>
Acked-by: Oliver Hartkopp <[e-mail]>
Signed-off-by: Marc Kleine-Budde <[e-mail]>

drivers/net/can/Kconfig

···
 	  Driver for TI HECC (High End CAN Controller) module found on many
 	  TI devices. The device specifications are available from www.ti.com
 
-config CAN_MCP251X
-	tristate "Microchip MCP251x SPI CAN controllers"
-	depends on SPI && HAS_DMA
-	---help---
-	  Driver for the Microchip MCP251x SPI CAN controllers.
-
 config CAN_BFIN
 	depends on BF534 || BF536 || BF537 || BF538 || BF539 || BF54x
 	tristate "Analog Devices Blackfin on-chip CAN"
···
 source "drivers/net/can/c_can/Kconfig"
 
 source "drivers/net/can/cc770/Kconfig"
+
+source "drivers/net/can/spi/Kconfig"
 
 source "drivers/net/can/usb/Kconfig"
 

drivers/net/can/Makefile

···
 
 can-dev-$(CONFIG_CAN_LEDS)	+= led.o
 
+obj-y				+= spi/
 obj-y				+= usb/
 obj-y				+= softing/
 
···
 obj-$(CONFIG_CAN_CC770)		+= cc770/
 obj-$(CONFIG_CAN_AT91)		+= at91_can.o
 obj-$(CONFIG_CAN_TI_HECC)	+= ti_hecc.o
-obj-$(CONFIG_CAN_MCP251X)	+= mcp251x.o
 obj-$(CONFIG_CAN_BFIN)		+= bfin_can.o
 obj-$(CONFIG_CAN_JANZ_ICAN3)	+= janz-ican3.o
 obj-$(CONFIG_CAN_FLEXCAN)	+= flexcan.o

drivers/net/can/spi/Kconfig

···
+menu "CAN SPI interfaces"
+	depends on SPI
+
+config CAN_MCP251X
+	tristate "Microchip MCP251x SPI CAN controllers"
+	depends on HAS_DMA
+	---help---
+	  Driver for the Microchip MCP251x SPI CAN controllers.
+
+endmenu

drivers/net/can/spi/Makefile

···
+#
+#  Makefile for the Linux Controller Area Network SPI drivers.
+#
+
+
+obj-$(CONFIG_CAN_MCP251X)	+= mcp251x.o
+
+ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG