Looks like same issue as reported in https://github.com/raspberrypi/linux/issues/2098. We have CONFIG_MMC_BCM2835=y defined but not in raspberry pi upstream (I'm looking at https://github.com/raspberrypi/linux/blob/rpi-4.14.y/arch/arm/configs/bcm2709_defconfig). Interestingly, both drivers/mmc/host/bcm2835.c and drivers/mmc/host/bcm2835-sdhost.c contains "MODULE_ALIAS("platform:sdhost-bcm2835");"
Looks like same issue as reported in https:/ /github. com/raspberrypi /linux/ issues/ 2098. We have CONFIG_ MMC_BCM2835= y defined but not in raspberry pi upstream (I'm looking at https:/ /github. com/raspberrypi /linux/ blob/rpi- 4.14.y/ arch/arm/ configs/ bcm2709_ defconfig). Interestingly, both drivers/ mmc/host/ bcm2835. c and drivers/ mmc/host/ bcm2835- sdhost. c contains "MODULE_ ALIAS(" platform: sdhost- bcm2835" );"