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diff --git a/sys/arm64/conf/std.nxp b/sys/arm64/conf/std.nxp
--- a/sys/arm64/conf/std.nxp
+++ b/sys/arm64/conf/std.nxp
@@ -9,6 +9,7 @@
device pca9547 # NPX I2C bus multiplexer
device pcf8563 # NXP Real-time clock/calendar
device tca6408 # NXP I2C gpio expander
+device pcf85063 # NXP Real-time clock
# Serial (COM) ports
device uart_ns8250 # ns8250-type UART driver
diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -1866,6 +1866,7 @@
dev/iicbus/pcf8574.c optional pcf8574
dev/iicbus/pcf8591.c optional pcf8591
dev/iicbus/rtc8583.c optional rtc8583
+dev/iicbus/rtc/pcf85063.c optional pcf85063 iicbus fdt
dev/iicbus/rtc/rx8803.c optional rx8803 iicbus fdt
dev/iicbus/s35390a.c optional s35390a
dev/iicbus/sy8106a.c optional sy8106a ext_resources fdt
diff --git a/sys/dev/iicbus/rtc/pcf85063.c b/sys/dev/iicbus/rtc/pcf85063.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/iicbus/rtc/pcf85063.c
@@ -0,0 +1,268 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Alstom Group.
+ * Copyright (c) 2021 Semihalf.
+ *
+ * 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 ``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 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_platform.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/clock.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/iicbus/iiconf.h>
+#include <dev/iicbus/iicbus.h>
+
+#include "clock_if.h"
+#include "iicbus_if.h"
+
+#define BIT(x) (1 << (x))
+
+#define PCF85063_CTRL1_REG 0x0
+#define PCF85063_TIME_REG 0x4
+
+#define PCF85063_CTRL1_TIME_FORMAT BIT(1)
+#define PCF85063_CTRL1_RTC_CLK_STOP BIT(5)
+#define PCF85063_TIME_REG_OSC_STOP BIT(7)
+
+#define PCF85063_HALF_OF_SEC_NS 500000000
+
+struct pcf85063_time {
+ uint8_t sec;
+ uint8_t min;
+ uint8_t hour;
+ uint8_t day;
+ uint8_t dow;
+ uint8_t mon;
+ uint8_t year;
+};
+
+static int pcf85063_attach(device_t dev);
+static int pcf85063_detach(device_t dev);
+static int pcf85063_probe(device_t dev);
+
+static int pcf85063_get_time(device_t dev, struct timespec *ts);
+static int pcf85063_set_time(device_t dev, struct timespec *ts);
+
+static int pcf85063_check_status(device_t dev);
+
+static struct ofw_compat_data pcf85063_compat_data[] = {
+ { "nxp,pcf85063", 1},
+ { NULL, 0}
+};
+
+static int
+pcf85063_check_status(device_t dev)
+{
+ uint8_t flags;
+ int error;
+
+ error = iicdev_readfrom(dev, PCF85063_TIME_REG, &flags, 1, IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ if (flags & PCF85063_TIME_REG_OSC_STOP) {
+ device_printf(dev,
+ "Low voltage flag set, date is incorrect.\n");
+ return (ENXIO);
+ }
+
+ return (0);
+}
+
+static int
+pcf85063_attach(device_t dev)
+{
+
+ clock_register_flags(dev, 1000000, 0);
+ clock_schedule(dev, 1);
+
+ return (0);
+}
+
+static int
+pcf85063_detach(device_t dev)
+{
+
+ clock_unregister(dev);
+
+ return (0);
+}
+
+static int
+pcf85063_get_time(device_t dev, struct timespec *ts)
+{
+ struct pcf85063_time data;
+ struct bcd_clocktime bcd;
+ uint8_t control_reg;
+ int error;
+
+ error = pcf85063_check_status(dev);
+ if (error != 0)
+ return (error);
+
+ /* read hour format (12/24 hour mode) */
+ error = iicdev_readfrom(dev, PCF85063_CTRL1_REG, &control_reg,
+ sizeof(uint8_t), IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ /* read current date and time */
+ error = iicdev_readfrom(dev, PCF85063_TIME_REG, &data,
+ sizeof(struct pcf85063_time), IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ bcd.nsec = 0;
+ bcd.sec = data.sec & 0x7F;
+ bcd.min = data.min & 0x7F;
+ bcd.ispm = data.hour & 0x20;
+
+ if (control_reg & PCF85063_CTRL1_TIME_FORMAT)
+ /* 12 hour mode */
+ bcd.hour = data.hour & 0x1F;
+ else
+ /* 24 hour mode */
+ bcd.hour = data.hour & 0x3F;
+
+ bcd.dow = (data.dow & 0x7) + 1;
+ bcd.day = data.day & 0x3F;
+ bcd.mon = data.mon & 0x1F;
+ bcd.year = data.year;
+
+ clock_dbgprint_bcd(dev, CLOCK_DBG_READ, &bcd);
+ error = clock_bcd_to_ts(&bcd, ts, true);
+
+ return (error);
+}
+
+static int
+pcf85063_set_time(device_t dev, struct timespec *ts)
+{
+ uint8_t time_reg, ctrl_reg;
+ struct pcf85063_time data;
+ struct bcd_clocktime bcd;
+ int error;
+
+ ts->tv_sec -= utc_offset();
+ clock_ts_to_bcd(ts, &bcd, true);
+ clock_dbgprint_bcd(dev, CLOCK_DBG_WRITE, &bcd);
+
+ data.sec = bcd.sec;
+ data.min = bcd.min;
+ data.hour = bcd.hour;
+ data.dow = bcd.dow - 1;
+ data.day = bcd.day;
+ data.mon = bcd.mon;
+ data.year = bcd.year;
+
+ if (ts->tv_nsec > PCF85063_HALF_OF_SEC_NS)
+ data.sec++;
+
+ /* disable clock */
+ error = iicdev_readfrom(dev, PCF85063_CTRL1_REG, &ctrl_reg,
+ sizeof(uint8_t), IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ ctrl_reg |= PCF85063_CTRL1_RTC_CLK_STOP;
+
+ error = iicdev_writeto(dev, PCF85063_CTRL1_REG, &ctrl_reg,
+ sizeof(uint8_t), IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ /* clock is disabled now, write time and date */
+ error = iicdev_writeto(dev, PCF85063_TIME_REG, &data,
+ sizeof(struct pcf85063_time), IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ /* restart clock */
+ ctrl_reg &= ~PCF85063_CTRL1_RTC_CLK_STOP;
+ error = iicdev_writeto(dev, PCF85063_CTRL1_REG, &ctrl_reg,
+ sizeof(uint8_t), IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ /* reset low voltage flag */
+ error = iicdev_readfrom(dev, PCF85063_TIME_REG, &time_reg,
+ sizeof(uint8_t), IIC_WAIT);
+ if (error != 0)
+ return (error);
+
+ time_reg &= ~PCF85063_TIME_REG_OSC_STOP;
+
+ error = iicdev_writeto(dev, PCF85063_TIME_REG, &time_reg,
+ sizeof(uint8_t), IIC_WAIT);
+
+ return (error);
+}
+
+static int
+pcf85063_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (!ofw_bus_search_compatible(dev, pcf85063_compat_data)->ocd_data)
+ return (ENXIO);
+
+ device_set_desc(dev, "NXP pcf85063 Real Time Clock");
+
+ return (BUS_PROBE_GENERIC);
+}
+
+static device_method_t pcf85063_methods [] = {
+ DEVMETHOD(device_attach, pcf85063_attach),
+ DEVMETHOD(device_detach, pcf85063_detach),
+ DEVMETHOD(device_probe, pcf85063_probe),
+
+ DEVMETHOD(clock_gettime, pcf85063_get_time),
+ DEVMETHOD(clock_settime, pcf85063_set_time),
+
+ DEVMETHOD_END
+};
+
+static driver_t pcf85063_driver = {
+ "pcf85063",
+ pcf85063_methods,
+ 0
+};
+
+static devclass_t pcf85063_devclass;
+
+DRIVER_MODULE(pcf85063, iicbus, pcf85063_driver, pcf85063_devclass, NULL, NULL);
+IICBUS_FDT_PNP_INFO(pcf85063_compat_data);
diff --git a/sys/modules/i2c/Makefile b/sys/modules/i2c/Makefile
--- a/sys/modules/i2c/Makefile
+++ b/sys/modules/i2c/Makefile
@@ -29,8 +29,8 @@
smbus \
.if !empty(OPT_FDT)
-SUBDIR += tca6416 \
- rx8803
+SUBDIR += rx8803 \
+ tca6416
.endif
.if ${MACHINE_CPUARCH} == "aarch64" || ${MACHINE_CPUARCH} == "amd64" || \

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