brcm80211: fmac: add Kconfig option for SDIO bus support

This patch adds a Kconfig option for SDIO bus support and abstracts
a build subset correspondingly. It's the final patch of fullmac bus
interface refactoring.
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/Kconfig

@@ -17,16 +17,26 @@ config BRCMSMAC
 
 config BRCMFMAC
 	tristate "Broadcom IEEE802.11n embedded FullMAC WLAN driver"
-	depends on MMC
 	depends on CFG80211
 	select BRCMUTIL
-	select FW_LOADER
 	---help---
 	  This module adds support for embedded wireless adapters based on
-	  Broadcom IEEE802.11n FullMAC chipsets.  This driver uses the kernel's
-	  wireless extensions subsystem.  If you choose to build a module,
+	  Broadcom IEEE802.11n FullMAC chipsets. It has to work with at least
+	  one of the bus interface support. If you choose to build a module,
 	  it'll be called brcmfmac.ko.
 
+config BRCMFMAC_SDIO
+	bool "SDIO bus interface support for FullMAC"
+	depends on MMC
+	depends on BRCMFMAC
+	select FW_LOADER
+	default y
+	---help---
+	  This option enables the SDIO bus interface support for Broadcom
+	  FullMAC WLAN driver.
+	  Say Y if you want to use brcmfmac for a compatible SDIO interface
+	  wireless card.
+
 config BRCMDBG
 	bool "Broadcom driver debug functions"
 	depends on BRCMSMAC || BRCMFMAC

drivers/net/wireless/brcm80211/brcmfmac/Makefile

@@ -19,16 +19,16 @@ ccflags-y += \
 	-Idrivers/net/wireless/brcm80211/brcmfmac	\
 	-Idrivers/net/wireless/brcm80211/include
 
-DHDOFILES = \
+obj-$(CONFIG_BRCMFMAC) += brcmfmac.o
+brcmfmac-objs += \
 		wl_cfg80211.o \
 		dhd_cdc.o \
 		dhd_common.o \
+		dhd_linux.o
+brcmfmac-$(CONFIG_BRCMFMAC_SDIO) += \
 		dhd_sdio.o \
-	dhd_linux.o \
 		bcmsdh.o \
 		bcmsdh_sdmmc.o \
 		sdio_chip.o
 
-obj-$(CONFIG_BRCMFMAC) += brcmfmac.o
-brcmfmac-objs += $(DHDOFILES)
 ccflags-y += -D__CHECK_ENDIAN__