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diff --git a/sys/conf/files b/sys/conf/files
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -1770,6 +1770,7 @@
dev/fdt/fdt_static_dtb.S optional fdt fdt_dtb_static \
dependency "${FDT_DTS_FILE:T:R}.dtb"
dev/fdt/simplebus.c optional fdt
+dev/fdt/simplepmbus.c optional fdt
dev/fdt/simple_mfd.c optional syscon fdt
dev/filemon/filemon.c optional filemon
dev/firewire/firewire.c optional firewire
diff --git a/sys/dev/fdt/simplepmbus.c b/sys/dev/fdt/simplepmbus.c
new file mode 100644
--- /dev/null
+++ b/sys/dev/fdt/simplepmbus.c
@@ -0,0 +1,140 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Oskar Holmlund <oskar.holmlund@ohdata.se>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+/*
+ * Bindings
+ * sys/contrib/device-tree/Bindings/bus/simple-pm-bus.yaml
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/module.h>
+#include <sys/bus.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <sys/rman.h>
+
+#include <dev/extres/clk/clk.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/fdt/simplebus.h>
+
+
+struct simple_pm_bus_softc {
+ struct simplebus_softc simplebus;
+ device_t dev;
+ clk_t clk_fck;
+};
+
+static int
+simple_pm_bus_probe(device_t dev)
+{
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ /*
+ * for now: require "ranges"
+ * later require "clock" or "power-domains" aswell.
+ */
+ if (!(ofw_bus_is_compatible(dev, "simple-pm-bus") &&
+ ofw_bus_has_prop(dev, "ranges")))
+ {
+ return (ENXIO);
+ }
+
+ device_set_desc(dev, "Simple Power-Managed Bus");
+
+ return (BUS_PROBE_GENERIC);
+}
+
+static void
+simple_pm_bus_delayed_attach(void *xsc)
+{
+ int err;
+ struct simple_pm_bus_softc *sc;
+
+ sc = (struct simple_pm_bus_softc *)xsc;
+
+ /* Enable the clock */
+ err = clk_enable(sc->clk_fck);
+ if (err != 0)
+ device_printf(sc->dev, "Failed to enable clk\n");
+}
+
+static int
+simple_pm_bus_attach(device_t dev)
+{
+ struct simple_pm_bus_softc *sc;
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+
+ if (ofw_bus_has_prop(dev, "power-domains"))
+ device_printf(dev,
+ "Note power-domains are currently unsupported\n");
+
+ if (ofw_bus_has_prop(dev, "clock")) {
+ /* expect one clock */
+ int err;
+ err = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_fck);
+ if (err != 0) {
+ device_printf(dev, "Cant find clock (err %d)\n",
+ err);
+ return (ENXIO);
+ }
+ config_intrhook_oneshot(simple_pm_bus_delayed_attach, sc);
+ }
+
+ return (simplebus_attach(dev));
+}
+
+static int
+simple_pm_bus_detach(device_t dev)
+{
+ return (simplebus_detach(dev));
+}
+
+static device_method_t simple_pm_bus_methods[] = {
+ DEVMETHOD(device_probe, simple_pm_bus_probe),
+ DEVMETHOD(device_attach, simple_pm_bus_attach),
+ DEVMETHOD(device_detach, simple_pm_bus_detach),
+ DEVMETHOD_END
+};
+
+DEFINE_CLASS_1(simple_pm_bus, simple_pm_bus_driver, simple_pm_bus_methods,
+ sizeof(struct simple_pm_bus_softc), simplebus_driver);
+
+static devclass_t simple_pm_bus_devclass;
+EARLY_DRIVER_MODULE(simple_pm_bus, simplebus, simple_pm_bus_driver,
+ simple_pm_bus_devclass, 0, 0,
+ BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
+
+MODULE_VERSION(simple_pm_bus, 1);

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