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diff --git a/sys/arm64/arm64/pl031_rtc.c b/sys/arm64/arm64/pl031_rtc.c
new file mode 100644
--- /dev/null
+++ b/sys/arm64/arm64/pl031_rtc.c
@@ -0,0 +1,153 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023 Arm Ltd
+ *
+ * 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.
+ */
+
+/*
+ * Driver for the Arm PL031 RTC device
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/clock.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/rman.h>
+
+#include <machine/bus.h>
+#include <machine/resource.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "clock_if.h"
+
+#define RTCDR 0x00
+#define RTCMR 0x04
+#define RTCLR 0x08
+#define RTCCR 0x0c
+#define RTCIMSR 0x10
+#define RTCRIS 0x14
+#define RTCMIS 0x18
+#define RTCICR 0x1c
+
+struct pl031_softc {
+ struct resource *reg;
+ int reg_rid;
+};
+
+static device_probe_t pl031_probe;
+static device_attach_t pl031_attach;
+static device_detach_t pl031_detach;
+
+static clock_gettime_t pl031_gettime;
+static clock_settime_t pl031_settime;
+
+static int
+pl031_probe(device_t dev)
+{
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_is_compatible(dev, "arm,pl031"))
+ return (ENXIO);
+
+ device_set_desc(dev, "PL031 RTC");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+pl031_attach(device_t dev)
+{
+ struct pl031_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ sc->reg_rid = 0;
+ sc->reg = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->reg_rid,
+ RF_ACTIVE);
+ if (sc->reg == 0)
+ return (ENXIO);
+
+ clock_register(dev, 1000000);
+
+ return (0);
+}
+
+static int
+pl031_detach(device_t dev)
+{
+ struct pl031_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ clock_unregister(dev);
+ bus_release_resource(dev, SYS_RES_MEMORY, sc->reg_rid, sc->reg);
+
+ return (0);
+}
+
+static int
+pl031_gettime(device_t dev, struct timespec *ts)
+{
+ struct pl031_softc *sc;
+
+ sc = device_get_softc(dev);
+ ts->tv_sec = bus_read_4(sc->reg, RTCDR);
+ ts->tv_nsec = 0;
+
+ return (0);
+}
+
+static int
+pl031_settime(device_t dev, struct timespec *ts)
+{
+ struct pl031_softc *sc;
+
+ sc = device_get_softc(dev);
+ bus_write_4(sc->reg, RTCLR, ts->tv_sec);
+ return (0);
+}
+
+static device_method_t pl031_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, pl031_probe),
+ DEVMETHOD(device_attach, pl031_attach),
+ DEVMETHOD(device_detach, pl031_detach),
+
+ /* Clock interface */
+ DEVMETHOD(clock_gettime, pl031_gettime),
+ DEVMETHOD(clock_settime, pl031_settime),
+
+ /* End */
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_0(pl031, pl031_driver, pl031_methods,
+ sizeof(struct pl031_softc));
+
+DRIVER_MODULE(pl031, simplebus, pl031_driver, 0, 0);
diff --git a/sys/arm64/conf/std.arm b/sys/arm64/conf/std.arm
--- a/sys/arm64/conf/std.arm
+++ b/sys/arm64/conf/std.arm
@@ -8,6 +8,9 @@
# GPIO / PINCTRL
device pl061 # Arm PL061 GPIO controller
+# RTC
+device pl031 # Arm PL031 RTC
+
# Serial (COM) ports
device pl011
diff --git a/sys/conf/files.arm64 b/sys/conf/files.arm64
--- a/sys/conf/files.arm64
+++ b/sys/conf/files.arm64
@@ -64,6 +64,7 @@
arm64/arm64/mp_machdep.c optional smp
arm64/arm64/nexus.c standard
arm64/arm64/ofw_machdep.c optional fdt
+arm64/arm64/pl031_rtc.c optional fdt pl031
arm64/arm64/ptrauth.c standard \
compile-with "${NORMAL_C:N-mbranch-protection*}"
arm64/arm64/pmap.c standard

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