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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
@@ -25,6 +25,9 @@
device dpaa2 # Data Path Acceleration Architecture (2nd Gen)
device enetc # QorIQ LS1028A NIC
+# SFF/SFP
+device sff # Small Form Factor Transceivers
+
options FDT
device acpi
diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -3060,6 +3060,8 @@
dev/sdio/sdio_if.m optional mmccam
dev/sdio/sdio_subr.c optional mmccam
dev/sdio/sdiob.c optional mmccam
+dev/sff/sff_if.m optional sff
+dev/sff/sfp_fdt.c optional sff fdt
dev/sge/if_sge.c optional sge pci
dev/siis/siis.c optional siis pci
dev/sis/if_sis.c optional sis pci
diff --git a/sys/dev/sff/sff_if.m b/sys/dev/sff/sff_if.m
new file mode 100644
--- /dev/null
+++ b/sys/dev/sff/sff_if.m
@@ -0,0 +1,35 @@
+#-
+# SPDX-License-Identifier: BSD-2-Clause
+#
+# Copyright © 2023 Dmitry Salychev
+#
+# 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.
+#
+
+#include <machine/bus.h>
+
+INTERFACE sff;
+
+METHOD int get_i2c_bus {
+ device_t dev;
+ device_t *i2c_bus;
+};
diff --git a/sys/dev/sff/sfp_fdt.c b/sys/dev/sff/sfp_fdt.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/sff/sfp_fdt.c
@@ -0,0 +1,156 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright © 2023 Dmitry Salychev
+ *
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Small Form Factor (SFF) Committee Pluggable (SFP) Transceiver (FDT-based).
+ */
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/module.h>
+
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+#include <dev/fdt/simplebus.h>
+
+#include "sff_if.h"
+
+struct sfp_fdt_softc {
+ phandle_t ofw_node;
+ phandle_t i2c_bus;
+
+ phandle_t mod_def;
+ phandle_t los;
+ phandle_t tx_fault;
+ phandle_t tx_disable;
+ phandle_t rx_rate;
+ phandle_t tx_rate;
+ uint32_t max_power; /* in mW */
+};
+
+static int
+sfp_fdt_probe(device_t dev)
+{
+ phandle_t node;
+ ssize_t s;
+
+ node = ofw_bus_get_node(dev);
+ if (!ofw_bus_node_is_compatible(node, "sff,sfp")) {
+ return (ENXIO);
+ }
+
+ s = device_get_property(dev, "i2c-bus", &node, sizeof(node),
+ DEVICE_PROP_HANDLE);
+ if (s == -1) {
+ device_printf(dev, "%s: '%s' has no 'i2c-bus' property, s %zd\n",
+ __func__, ofw_bus_get_name(dev), s);
+ return (ENXIO);
+ }
+
+ device_set_desc(dev, "Small Form-factor Pluggable Transceiver");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+sfp_fdt_attach(device_t dev)
+{
+ struct sfp_fdt_softc *sc;
+ ssize_t s;
+ int error;
+
+ sc = device_get_softc(dev);
+ sc->ofw_node = ofw_bus_get_node(dev);
+
+ s = device_get_property(dev, "i2c-bus", &sc->i2c_bus,
+ sizeof(sc->i2c_bus), DEVICE_PROP_HANDLE);
+ if (s == -1) {
+ device_printf(dev, "%s: cannot find 'i2c-bus' property: %zd\n",
+ __func__, s);
+ return (ENXIO);
+ }
+
+ /* Optional properties */
+ (void)device_get_property(dev, "mod-def0-gpios", &sc->mod_def,
+ sizeof(sc->mod_def), DEVICE_PROP_HANDLE);
+ (void)device_get_property(dev, "los-gpios", &sc->los, sizeof(sc->los),
+ DEVICE_PROP_HANDLE);
+ (void)device_get_property(dev, "tx-fault-gpios", &sc->tx_fault,
+ sizeof(sc->tx_fault), DEVICE_PROP_HANDLE);
+ (void)device_get_property(dev, "tx-disable-gpios", &sc->tx_disable,
+ sizeof(sc->tx_disable), DEVICE_PROP_HANDLE);
+ (void)device_get_property(dev, "rate-select0-gpios", &sc->rx_rate,
+ sizeof(sc->rx_rate), DEVICE_PROP_HANDLE);
+ (void)device_get_property(dev, "rate-select1-gpios", &sc->tx_rate,
+ sizeof(sc->tx_rate), DEVICE_PROP_HANDLE);
+ (void)device_get_property(dev, "maximum-power-milliwatt", &sc->max_power,
+ sizeof(sc->max_power), DEVICE_PROP_UINT32);
+
+ error = OF_device_register_xref(OF_xref_from_node(sc->ofw_node), dev);
+ if (error != 0) {
+ device_printf(dev, "%s: failed to register xref %#x\n",
+ __func__, OF_xref_from_node(sc->ofw_node));
+ }
+
+ return (error);
+}
+
+static int
+sfp_fdt_get_i2c_bus(device_t dev, device_t *i2c_bus)
+{
+ struct sfp_fdt_softc *sc = device_get_softc(dev);
+ device_t xdev = OF_device_from_xref(OF_xref_from_node(sc->i2c_bus));
+
+ if (xdev != NULL) {
+ *i2c_bus = xdev;
+ return (0);
+ }
+ return (ENXIO);
+}
+
+static device_method_t sfp_fdt_methods[] = {
+ /* Device interface */
+ DEVMETHOD(device_probe, sfp_fdt_probe),
+ DEVMETHOD(device_attach, sfp_fdt_attach),
+ DEVMETHOD(device_detach, bus_generic_detach),
+
+ /* SFF */
+ DEVMETHOD(sff_get_i2c_bus, sfp_fdt_get_i2c_bus),
+
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_0(sfp_fdt, sfp_fdt_driver, sfp_fdt_methods,
+ sizeof(struct sfp_fdt_softc));
+
+EARLY_DRIVER_MODULE(sfp_fdt, simplebus, sfp_fdt_driver, 0, 0,
+ BUS_PASS_SUPPORTDEV);
+EARLY_DRIVER_MODULE(sfp_fdt, ofwbus, sfp_fdt_driver, 0, 0,
+ BUS_PASS_SUPPORTDEV);
diff --git a/sys/modules/Makefile b/sys/modules/Makefile
--- a/sys/modules/Makefile
+++ b/sys/modules/Makefile
@@ -357,6 +357,7 @@
${_sdhci_fdt} \
sdhci_pci \
sdio \
+ ${_sff} \
sem \
send \
${_sfxge} \
@@ -679,6 +680,7 @@
.if ${MACHINE_CPUARCH} == "aarch64"
_armv8crypto= armv8crypto
_dpaa2= dpaa2
+_sff= sff
_em= em
_hyperv= hyperv
diff --git a/sys/modules/sff/Makefile b/sys/modules/sff/Makefile
new file mode 100644
--- /dev/null
+++ b/sys/modules/sff/Makefile
@@ -0,0 +1,13 @@
+.PATH: ${SRCTOP}/sys/dev/sff
+
+KMOD= sff
+
+SRCS+= sff_if.c sff_if.h
+SRCS+= bus_if.h device_if.h
+
+.if !empty(OPT_FDT)
+SRCS+= sfp_fdt.c \
+ ofw_bus_if.h
+.endif
+
+.include <bsd.kmod.mk>

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