Bluetooth: Add Marvell BT-over-SDIO driver

This driver supports Marvell Bluetooth enabled devices with SDIO
interface. Currently only SD8688 chip is supported.

The helper/firmware images of SD8688 can be downloaded from this tree:
git://git.infradead.org/users/dwmw2/linux-firmware.git

This patch incorporates a lot of comments given by
Nicolas Pitre <nico@marvell.com>. Many thanks to Nicolas Pitre.

Signed-off-by: Rahul Tank <rahult@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index b049a79..8c89bd4 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -182,5 +182,18 @@
 	  Say Y here to compile Marvell Bluetooth driver
 	  into the kernel or say M to compile it as module.
 
+config BT_MRVL_SDIO
+	tristate "Marvell BT-over-SDIO driver"
+	depends on BT_MRVL && MMC
+	help
+	  The driver for Marvell Bluetooth chipsets with SDIO interface.
+
+	  This driver is required if you want to use Marvell Bluetooth
+	  devices with SDIO interface. Currently only SD8688 chipset is
+	  supported.
+
+	  Say Y here to compile support for Marvell BT-over-SDIO driver
+	  into the kernel or say M to compile it as module.
+
 endmenu