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diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -1588,6 +1588,7 @@
dev/dcons/dcons_os.c optional dcons
dev/dialog/da9063/da9063_if.m optional da9063_pmic
dev/dialog/da9063/da9063_iic.c optional da9063_pmic iicbus fdt
+dev/dialog/da9063/da9063_rtc.c optional da9063_rtc fdt
dev/dme/if_dme.c optional dme
dev/drm2/drm_agpsupport.c optional drm2
dev/drm2/drm_auth.c optional drm2
diff --git a/sys/dev/dialog/da9063/da9063_rtc.c b/sys/dev/dialog/da9063/da9063_rtc.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/dialog/da9063/da9063_rtc.c
@@ -0,0 +1,293 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2022 Jessica Clarke <jrtc27@FreeBSD.org>
+ *
+ * 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.
+ */
+
+/* Dialog Semiconductor DA9063 RTC */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/clock.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+
+#include <dev/dialog/da9063/da9063reg.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "clock_if.h"
+#include "da9063_if.h"
+
+#define DA9063_RTC_BASE_YEAR 2000
+
+struct da9063_rtc_softc {
+ device_t dev;
+ device_t parent;
+ struct mtx mtx;
+};
+
+#define DA9063_RTC_LOCK(sc) mtx_lock(&(sc)->mtx)
+#define DA9063_RTC_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
+#define DA9063_RTC_ASSERT_LOCKED(sc) mtx_assert(&(sc)->mtx, MA_OWNED);
+#define DA9063_RTC_ASSERT_UNLOCKED(sc) mtx_assert(&(sc)->mtx, MA_NOTOWNED);
+
+static struct ofw_compat_data compat_data[] = {
+ { "dlg,da9063-rtc", 1 },
+ { NULL, 0 }
+};
+
+static int
+da9063_rtc_read_ct(struct da9063_rtc_softc *sc, struct clocktime *ct)
+{
+ uint8_t sec, min, hour, day, mon, year;
+ int error;
+
+ DA9063_RTC_ASSERT_LOCKED(sc)
+
+ error = DA9063_READ(sc->parent, DA9063_COUNT_S, &sec);
+ if (error != 0)
+ return (error);
+ if ((sec & DA9063_COUNT_S_RTC_READ) == 0)
+ return (EAGAIN);
+
+ error = DA9063_READ(sc->parent, DA9063_COUNT_MI, &min);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_READ(sc->parent, DA9063_COUNT_H, &hour);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_READ(sc->parent, DA9063_COUNT_D, &day);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_READ(sc->parent, DA9063_COUNT_MO, &mon);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_READ(sc->parent, DA9063_COUNT_Y, &year);
+ if (error != 0)
+ return (error);
+
+ ct->nsec = 0;
+ ct->dow = -1;
+ ct->sec = sec & DA9063_COUNT_S_COUNT_SEC_MASK;
+ ct->min = min & DA9063_COUNT_MI_COUNT_MIN_MASK;
+ ct->hour = hour & DA9063_COUNT_H_COUNT_HOUR_MASK;
+ ct->day = day & DA9063_COUNT_D_COUNT_DAY_MASK;
+ ct->mon = mon & DA9063_COUNT_MO_COUNT_MONTH_MASK;
+ ct->year = (year & DA9063_COUNT_Y_COUNT_YEAR_MASK) +
+ DA9063_RTC_BASE_YEAR;
+
+ return (0);
+}
+
+static int
+da9063_rtc_write_ct(struct da9063_rtc_softc *sc, struct clocktime *ct)
+{
+ int error;
+
+ DA9063_RTC_ASSERT_LOCKED(sc)
+
+ error = DA9063_WRITE(sc->parent, DA9063_COUNT_S, ct->sec);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_WRITE(sc->parent, DA9063_COUNT_MI, ct->min);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_WRITE(sc->parent, DA9063_COUNT_H, ct->hour);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_WRITE(sc->parent, DA9063_COUNT_D, ct->day);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_WRITE(sc->parent, DA9063_COUNT_MO, ct->mon);
+ if (error != 0)
+ return (error);
+
+ error = DA9063_WRITE(sc->parent, DA9063_COUNT_Y,
+ (ct->year - DA9063_RTC_BASE_YEAR) &
+ DA9063_COUNT_Y_COUNT_YEAR_MASK);
+ if (error != 0)
+ return (error);
+
+ return (0);
+}
+
+static int
+da9063_rtc_gettime(device_t dev, struct timespec *ts)
+{
+ struct da9063_rtc_softc *sc;
+ struct clocktime ct, oldct;
+ int error;
+
+ sc = device_get_softc(dev);
+
+ DA9063_RTC_LOCK(sc);
+
+ error = da9063_rtc_read_ct(sc, &ct);
+ if (error != 0)
+ goto error;
+
+ /*
+ * Reading seconds only latches the other registers for "approx 0.5s",
+ * which should almost always be sufficient but is not guaranteed to
+ * be, so re-read to get a consistent set of values.
+ */
+ do {
+ oldct = ct;
+ error = da9063_rtc_read_ct(sc, &ct);
+ if (error != 0)
+ goto error;
+ } while (ct.min != oldct.min || ct.hour != oldct.hour ||
+ ct.day != oldct.day || ct.mon != oldct.mon ||
+ ct.year != oldct.year);
+
+ DA9063_RTC_UNLOCK(sc);
+
+ error = clock_ct_to_ts(&ct, ts);
+ if (error != 0)
+ return (error);
+
+ return (0);
+
+error:
+ DA9063_RTC_UNLOCK(sc);
+ return (error);
+}
+
+static int
+da9063_rtc_settime(device_t dev, struct timespec *ts)
+{
+ struct da9063_rtc_softc *sc;
+ struct clocktime ct;
+ int error;
+
+ sc = device_get_softc(dev);
+
+ /*
+ * We request a timespec with no resolution-adjustment. That also
+ * disables utc adjustment, so apply that ourselves.
+ */
+ ts->tv_sec -= utc_offset();
+ clock_ts_to_ct(ts, &ct);
+
+ DA9063_RTC_LOCK(sc);
+ error = da9063_rtc_write_ct(sc, &ct);
+ DA9063_RTC_UNLOCK(sc);
+
+ return (error);
+}
+
+static int
+da9063_rtc_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, "Dialog DA9063 RTC");
+
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+da9063_rtc_attach(device_t dev)
+{
+ struct da9063_rtc_softc *sc;
+ int error;
+
+ sc = device_get_softc(dev);
+
+ sc->dev = dev;
+ sc->parent = device_get_parent(dev);
+
+ /* Power on RTC and 32 kHz oscillator */
+ error = DA9063_MODIFY(sc->parent, DA9063_CONTROL_E, 0,
+ DA9063_CONTROL_E_RTC_EN);
+ if (error != 0)
+ return (error);
+
+ /* Connect 32 kHz oscillator */
+ error = DA9063_MODIFY(sc->parent, DA9063_EN_32K, 0,
+ DA9063_EN_32K_CRYSTAL);
+ if (error != 0)
+ return (error);
+
+ /* Disable alarms */
+ error = DA9063_MODIFY(sc->parent, DA9063_ALARM_Y,
+ DA9063_ALARM_Y_ALARM_ON | DA9063_ALARM_Y_TICK_ON, 0);
+ if (error != 0)
+ return (error);
+
+ mtx_init(&sc->mtx, device_get_nameunit(sc->dev), NULL, MTX_DEF);
+
+ /*
+ * Register as a system realtime clock with 1 second resolution.
+ */
+ clock_register_flags(dev, 1000000, CLOCKF_SETTIME_NO_ADJ);
+ clock_schedule(dev, 1);
+
+ return (0);
+}
+
+static int
+da9063_rtc_detach(device_t dev)
+{
+ struct da9063_rtc_softc *sc;
+
+ sc = device_get_softc(dev);
+
+ clock_unregister(dev);
+ mtx_destroy(&sc->mtx);
+
+ return (0);
+}
+
+static device_method_t da9063_rtc_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, da9063_rtc_probe),
+ DEVMETHOD(device_attach, da9063_rtc_attach),
+ DEVMETHOD(device_detach, da9063_rtc_detach),
+
+ /* Clock interface */
+ DEVMETHOD(clock_gettime, da9063_rtc_gettime),
+ DEVMETHOD(clock_settime, da9063_rtc_settime),
+
+ DEVMETHOD_END,
+};
+
+DEFINE_CLASS_0(da9063_rtc, da9063_rtc_driver, da9063_rtc_methods,
+ sizeof(struct da9063_rtc_softc));
+
+DRIVER_MODULE(da9063_rtc, da9063_pmic, da9063_rtc_driver, NULL, NULL);

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