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DWMMC(4) Device Drivers Manual DWMMC(4)

Synopsis DesignWare MMC/SD/SDIO controller

dwmmc* at fdt?
sdmmc* at dwmmc?

The dwmmc driver provides support for various MMC/SD/SDIO controllers based on the Synopsis Designware SD/eMMC core. These controllers are typically found on SoCs, such as the Rockchip RK3288/RK3399 and Samsung Exynos ARM SoCs.
The sdmmc(4) subsystem performs SD/MMC transactions to communicate with whatever MMC/SD/SDIO devices are inserted into the card slot or directly connected to the controller.

intro(4), sdmmc(4)

OpenBSD support for dwmmc first appeared in OpenBSD 6.2.

The dwmmc driver was written by Mark Kettenis <kettenis@openbsd.org>.
August 4, 2017 OpenBSD-current