mmc: mtk-sd: add SD/MMC host controller driver for MT7623 SoC

This patch adds MT7623 host controller driver for accessing SD/MMC.

Cc: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Tested-by: Matthias Brugger <matthias.bgg@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

drivers/mmc/Kconfig

@@ -602,6 +602,17 @@ config FTSDC010_SDIO
 	help
 		This can enable ftsdc010 sdio function.
 
+config MMC_MTK
+	bool "MediaTek SD/MMC Card Interface support"
+	depends on ARCH_MEDIATEK
+	depends on BLK && DM_MMC
+	depends on OF_CONTROL
+	help
+	  This selects the MediaTek(R) Secure digital and Multimedia card Interface.
+	  If you have a machine with a integrated SD/MMC card reader, say Y or M here.
+	  This is needed if support for any SD/SDIO/MMC devices is required.
+	  If unsure, say N.
+
 endif
 
 config TEGRA124_MMC_DISABLE_EXT_LOOPBACK

drivers/mmc/Makefile

@@ -65,3 +65,4 @@ obj-$(CONFIG_MMC_SUNXI)			+= sunxi_mmc.o
 obj-$(CONFIG_MMC_UNIPHIER)		+= tmio-common.o uniphier-sd.o
 obj-$(CONFIG_RENESAS_SDHI)		+= tmio-common.o renesas-sdhi.o
 obj-$(CONFIG_MMC_BCM2835)		+= bcm2835_sdhost.o
+obj-$(CONFIG_MMC_MTK)			+= mtk-sd.o