Index: sys/arm64/conf/GENERIC
===================================================================
--- sys/arm64/conf/GENERIC
+++ sys/arm64/conf/GENERIC
@@ -188,6 +188,7 @@
 device		mmc			# mmc/sd bus
 device		mmcsd			# mmc/sd flash cards
 device		dwmmc
+device		rk_emmcphy

 # Serial (COM) ports
 device		uart		# Generic UART driver
Index: sys/arm64/rockchip/rk3399_emmcphy.c
===================================================================
--- sys/arm64/rockchip/rk3399_emmcphy.c
+++ sys/arm64/rockchip/rk3399_emmcphy.c
@@ -0,0 +1,324 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2019 Ganbold Tsagaankhuu <ganbold@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Rockchip RK3399 eMMC PHY
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/gpio.h>
+#include <machine/bus.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/extres/clk/clk.h>
+#include <dev/extres/syscon/syscon.h>
+#include <dev/extres/phy/phy.h>
+
+#include "syscon_if.h"
+#include "phynode_if.h"
+
+#define	GRF_EMMCPHY_BASE	0xf780
+#define	GRF_EMMCPHY_CON0	(GRF_EMMCPHY_BASE + 0x00)
+#define	 PHYCTRL_FRQSEL		(1 << 13) | (1 << 12)
+#define	  PHYCTRL_FRQSEL_200M	0
+#define	  PHYCTRL_FRQSEL_50M	1
+#define	  PHYCTRL_FRQSEL_100M	2
+#define	  PHYCTRL_FRQSEL_150M	3
+#define	 PHYCTRL_OTAPDLYENA	(1 << 11)
+#define	 PHYCTRL_OTAPDLYSEL	(1 << 10) | (1 << 9) | (1 << 8) | (1 << 7)
+#define	 PHYCTRL_ITAPCHGWIN	(1 << 6)
+#define	 PHYCTRL_ITAPDLYSEL	(1 << 5) | (1 << 4)  | (1 << 3) | (1 << 2) | \
+    (1 << 1)
+#define	 PHYCTRL_ITAPDLYENA	(1 << 0)
+#define	GRF_EMMCPHY_CON1	(GRF_EMMCPHY_BASE + 0x04)
+#define	 PHYCTRL_CLKBUFSEL	(1 << 8) | (1 << 7) | (1 << 6)
+#define	 PHYCTRL_SELDLYTXCLK	(1 << 5)
+#define	 PHYCTRL_SELDLYRXCLK	(1 << 4)
+#define	 PHYCTRL_STRBSEL	0xf
+#define	GRF_EMMCPHY_CON2	(GRF_EMMCPHY_BASE + 0x08)
+#define	 PHYCTRL_REN_STRB	(1 << 9)
+#define	 PHYCTRL_REN_CMD	(1 << 8)
+#define	 PHYCTRL_REN_DAT	0xff
+#define	GRF_EMMCPHY_CON3	(GRF_EMMCPHY_BASE + 0x0c)
+#define	 PHYCTRL_PU_STRB	(1 << 9)
+#define	 PHYCTRL_PU_CMD		(1 << 8)
+#define	 PHYCTRL_PU_DAT		0xff
+#define	GRF_EMMCPHY_CON4	(GRF_EMMCPHY_BASE + 0x10)
+#define	 PHYCTRL_OD_RELEASE_CMD		(1 << 9)
+#define	 PHYCTRL_OD_RELEASE_STRB	(1 << 8)
+#define	 PHYCTRL_OD_RELEASE_DAT		0xff
+#define	GRF_EMMCPHY_CON5	(GRF_EMMCPHY_BASE + 0x14)
+#define	 PHYCTRL_ODEN_STRB	(1 << 9)
+#define	 PHYCTRL_ODEN_CMD	(1 << 8)
+#define	 PHYCTRL_ODEN_DAT	0xff
+#define	GRF_EMMCPHY_CON6	(GRF_EMMCPHY_BASE + 0x18)
+#define	 PHYCTRL_DLL_TRM_ICP	(1 << 12) | (1 << 11) | (1 << 10) | (1 << 9)
+#define	 PHYCTRL_EN_RTRIM	(1 << 8)
+#define	 PHYCTRL_RETRIM		(1 << 7)
+#define	 PHYCTRL_DR_TY		(1 << 6) | (1 << 5) | (1 << 4)
+#define	 PHYCTRL_RETENB		(1 << 3)
+#define	 PHYCTRL_RETEN		(1 << 2)
+#define	 PHYCTRL_ENDLL		(1 << 1)
+#define	 PHYCTRL_PDB		(1 << 0)
+#define	GRF_EMMCPHY_STATUS	(GRF_EMMCPHY_BASE + 0x20)
+#define	 PHYCTRL_CALDONE	(1 << 6)
+#define	 PHYCTRL_DLLRDY		(1 << 5)
+#define	 PHYCTRL_RTRIM		(1 << 4) | (1 << 3) | (1 << 2) | (1 << 1)
+#define	 PHYCTRL_EXR_NINST	(1 << 0)
+
+static struct ofw_compat_data compat_data[] = {
+	{ "rockchip,rk3399-emmc-phy",	1 },
+	{ NULL,				0 }
+};
+
+struct rk_emmcphy_softc {
+	struct syscon		*syscon;
+	struct rk_emmcphy_conf	*phy_conf;
+	clk_t			clk;
+};
+
+#define	LOWEST_SET_BIT(mask)	((((mask) - 1) & (mask)) ^ (mask))
+#define	SHIFTIN(x, mask)	((x) * LOWEST_SET_BIT(mask))
+
+static struct phynode *phynode;
+
+/* Phy class and methods. */
+static int rk_emmcphy_enable(struct phynode *phynode, bool enable);
+static phynode_method_t rk_emmcphynode_methods[] = {
+	PHYNODEMETHOD(phynode_enable,	rk_emmcphy_enable),
+	PHYNODEMETHOD_END
+};
+
+DEFINE_CLASS_1(rk_emmcphy_phynode, rk_emmcphy_phynode_class,
+    rk_emmcphynode_methods, sizeof(struct rk_emmcphy_softc), phynode_class);
+
+static int
+rk_emmcphy_enable(struct phynode *phynode, bool enable)
+{
+	struct rk_emmcphy_softc *sc;
+	device_t dev;
+	phy_t *phy;
+	uint64_t rate, frqsel;
+	uint32_t mask, val;
+	int error;
+
+	dev = phynode_get_device(phynode);
+	sc = device_get_softc(dev);
+
+	if (!enable) {
+		phy = NULL;
+		error = phy_get_by_id(dev, phynode_get_device(phynode),
+		    phynode_get_id(phynode), phy);
+		if (error != 0) {
+			device_printf(dev, "phy_get_by_id error: %d\n", error);
+			return (error);
+		}
+		error = phy_disable(*phy);
+		if (error != 0) {
+			device_printf(dev, "phy_disable error: %d\n", error);
+			return (error);
+		}
+		return (0);
+	}
+
+	sc->phy_conf = (struct rk_emmcphy_conf *)ofw_bus_search_compatible(dev,
+	    compat_data)->ocd_data;
+
+	/* Get clock */
+	error = clk_get_by_ofw_name(dev, 0, "emmcclk", &sc->clk);
+	if (error != 0) {
+		device_printf(dev, "cannot get emmcclk clock, continue\n");
+		sc->clk = NULL;
+	} else
+		device_printf(dev, "got emmcclk clock\n");
+
+	/* Drive strength */
+	mask = PHYCTRL_DR_TY;
+	val = SHIFTIN(0, PHYCTRL_DR_TY);
+	SYSCON_WRITE_4(sc->syscon, GRF_EMMCPHY_CON6, (mask << 16) | val);
+
+	/* Enable output tap delay */
+	mask = PHYCTRL_OTAPDLYENA | PHYCTRL_OTAPDLYSEL;
+	val = PHYCTRL_OTAPDLYENA | SHIFTIN(4, PHYCTRL_OTAPDLYSEL);
+	SYSCON_WRITE_4(sc->syscon, GRF_EMMCPHY_CON0, (mask << 16) | val);
+
+	/* Power down PHY and disable DLL before making changes */
+	mask = PHYCTRL_ENDLL | PHYCTRL_PDB;
+	val = 0;
+	SYSCON_WRITE_4(sc->syscon, GRF_EMMCPHY_CON6, (mask << 16) | val);
+
+	if (sc->clk) {
+		error = clk_get_freq(sc->clk, &rate);
+		if (error != 0) {
+			device_printf(dev, "cannot get clock frequency\n");
+			return (ENXIO);
+		}
+	} else
+		rate = 0;
+
+	if (rate != 0) {
+		if (rate < 75000000)
+			frqsel = PHYCTRL_FRQSEL_50M;
+		else if (rate < 125000000)
+			frqsel = PHYCTRL_FRQSEL_100M;
+		else if (rate < 175000000)
+			frqsel = PHYCTRL_FRQSEL_150M;
+		else
+			frqsel = PHYCTRL_FRQSEL_200M;
+	} else {
+		frqsel = PHYCTRL_FRQSEL_200M;
+	}
+
+	DELAY(3);
+
+	/* Power up PHY */
+	mask = PHYCTRL_PDB;
+	val = PHYCTRL_PDB;
+	SYSCON_WRITE_4(sc->syscon, GRF_EMMCPHY_CON6, (mask << 16) | val);
+
+	/* Wait for calibration */
+	DELAY(10);
+	val = SYSCON_READ_4(sc->syscon, GRF_EMMCPHY_STATUS);
+	if ((val & PHYCTRL_CALDONE) == 0) {
+		device_printf(dev, "PHY calibration did not complete\n");
+		return (ENXIO);
+	}
+
+	/* Set DLL frequency */
+	mask = PHYCTRL_FRQSEL;
+	val = SHIFTIN(frqsel, PHYCTRL_FRQSEL);
+	SYSCON_WRITE_4(sc->syscon, GRF_EMMCPHY_CON0, (mask << 16) | val);
+
+	/* Enable DLL */
+	mask = PHYCTRL_ENDLL;
+	val = PHYCTRL_ENDLL;
+	SYSCON_WRITE_4(sc->syscon, GRF_EMMCPHY_CON6, (mask << 16) | val);
+
+	if (rate != 0) {
+		/* Wait for DLL ready */
+		DELAY(50000);
+		val = SYSCON_READ_4(sc->syscon, GRF_EMMCPHY_STATUS);
+		if ((val & PHYCTRL_DLLRDY) == 0) {
+			device_printf(dev, "DLL loop failed to lock\n");
+			return (ENXIO);
+		}
+	}
+
+	return (0);
+}
+
+static int
+rk_emmcphy_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
+		return (ENXIO);
+
+	device_set_desc(dev, "Rockchip RK3399 eMMC PHY");
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+rk_emmcphy_attach(device_t dev)
+{
+	struct phynode_init_def phy_init;
+	struct rk_emmcphy_softc *sc;
+	phandle_t node;
+	phandle_t xnode;
+	pcell_t handle;
+
+	sc = device_get_softc(dev);
+	node = ofw_bus_get_node(dev);
+
+	if (OF_getencprop(node, "clocks", (void *)&handle,
+	    sizeof(handle)) <= 0) {
+		device_printf(dev, "cannot get clocks handle\n");
+		return (ENXIO);
+	}
+	xnode = OF_node_from_xref(handle);
+	if (OF_hasprop(xnode, "arasan,soc-ctl-syscon") &&
+	    syscon_get_by_ofw_property(dev, xnode,
+	    "arasan,soc-ctl-syscon", &sc->syscon) != 0) {
+		device_printf(dev, "cannot get grf driver handle\n");
+		return (ENXIO);
+	}
+
+	if (sc->syscon == NULL) {
+		device_printf(dev, "failed to get syscon\n");
+		return (ENXIO);
+	}
+
+	/* Create and register phy */
+	bzero(&phy_init, sizeof(phy_init));
+	phy_init.id = 0;
+	phy_init.ofw_node = ofw_bus_get_node(dev);
+	phynode = phynode_create(dev, &phynode_class, &phy_init);
+	if (phynode == NULL) {
+		device_printf(dev, "failed to create eMMC PHY\n");
+		return (ENXIO);
+	}
+	if (phynode_register(phynode) == NULL) {
+		device_printf(dev, "failed to register eMMC PHY\n");
+		return (ENXIO);
+	}
+
+	return (0);
+}
+
+static device_method_t rk_emmcphy_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		rk_emmcphy_probe),
+	DEVMETHOD(device_attach,	rk_emmcphy_attach),
+
+	DEVMETHOD_END
+};
+
+static driver_t rk_emmcphy_driver = {
+	"rk_emmcphy",
+	rk_emmcphy_methods,
+	sizeof(struct rk_emmcphy_softc)
+};
+
+static devclass_t rk_emmcphy_devclass;
+EARLY_DRIVER_MODULE(rk_emmcphy, simplebus, rk_emmcphy_driver,
+    rk_emmcphy_devclass, 0, 0, BUS_PASS_SUPPORTDEV + BUS_PASS_ORDER_MIDDLE);
+MODULE_VERSION(rk_emmcphy, 1);
Index: sys/conf/files.arm64
===================================================================
--- sys/conf/files.arm64
+++ sys/conf/files.arm64
@@ -269,6 +269,7 @@
 cddl/dev/fbt/aarch64/fbt_isa.c				optional dtrace_fbt | dtraceall compile-with "${FBT_C}"

 # RockChip Drivers
+arm64/rockchip/rk3399_emmcphy.c		optional fdt rk_emmcphy soc_rockchip_rk3399
 arm64/rockchip/rk_i2c.c			optional fdt rk_i2c soc_rockchip_rk3328 | fdt rk_i2c soc_rockchip_rk3399
 arm64/rockchip/rk805.c			optional fdt rk805 soc_rockchip_rk3328 | fdt rk805 soc_rockchip_rk3399
 arm64/rockchip/rk_grf.c			optional fdt soc_rockchip_rk3328 | fdt soc_rockchip_rk3399