Index: head/sys/conf/NOTES
===================================================================
--- head/sys/conf/NOTES
+++ head/sys/conf/NOTES
@@ -3044,3 +3044,6 @@
 
 # Encrypted kernel crash dumps.
 options 	EKCD
+
+# Enable legacy /dev/spigenN name aliases for /dev/spigenX.Y devices.
+options 	SPIGEN_LEGACY_CDEVNAME # legacy device names for spigen
Index: head/sys/conf/options
===================================================================
--- head/sys/conf/options
+++ head/sys/conf/options
@@ -992,6 +992,9 @@
 # GPIO and child devices
 GPIO_SPI_DEBUG	opt_gpio.h
 
+# SPI devices
+SPIGEN_LEGACY_CDEVNAME	opt_spi.h
+
 # etherswitch(4) driver
 RTL8366_SOFT_RESET opt_etherswitch.h
 
Index: head/sys/dev/spibus/spibus.c
===================================================================
--- head/sys/dev/spibus/spibus.c
+++ head/sys/dev/spibus/spibus.c
@@ -122,8 +122,10 @@
     size_t buflen)
 {
 	struct spibus_ivar *devi = SPIBUS_IVAR(child);
+	int cs;
 
-	snprintf(buf, buflen, "cs=%d", devi->cs);
+	cs = devi->cs & ~SPIBUS_CS_HIGH; /* trim 'cs high' bit */
+	snprintf(buf, buflen, "bus=%d cs=%d", device_get_unit(bus), cs);
 	return (0);
 }
 
Index: head/sys/dev/spibus/spigen.c
===================================================================
--- head/sys/dev/spibus/spigen.c
+++ head/sys/dev/spibus/spigen.c
@@ -26,6 +26,7 @@
 __FBSDID("$FreeBSD$");
 
 #include "opt_platform.h"
+#include "opt_spi.h"
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -64,6 +65,9 @@
 struct spigen_softc {
 	device_t sc_dev;
 	struct cdev *sc_cdev;
+#ifdef SPIGEN_LEGACY_CDEVNAME
+	struct cdev *sc_adev;           /* alias device */
+#endif
 	struct mtx sc_mtx;
 	uint32_t sc_command_length_max; /* cannot change while mmapped */
 	uint32_t sc_data_length_max;    /* cannot change while mmapped */
@@ -186,15 +190,46 @@
 {
 	struct spigen_softc *sc;
 	const int unit = device_get_unit(dev);
+	int cs, res;
+	struct make_dev_args mda;
 
+	spibus_get_cs(dev, &cs);
+	cs &= ~SPIBUS_CS_HIGH; /* trim 'cs high' bit */
+
 	sc = device_get_softc(dev);
 	sc->sc_dev = dev;
-	sc->sc_cdev = make_dev(&spigen_cdevsw, unit,
-	    UID_ROOT, GID_OPERATOR, 0660, "spigen%d", unit);
-	sc->sc_cdev->si_drv1 = dev;
 	sc->sc_command_length_max = PAGE_SIZE;
 	sc->sc_data_length_max = PAGE_SIZE;
+
 	mtx_init(&sc->sc_mtx, device_get_nameunit(dev), NULL, MTX_DEF);
+
+	make_dev_args_init(&mda);
+	mda.mda_flags = MAKEDEV_WAITOK;
+	mda.mda_devsw = &spigen_cdevsw;
+	mda.mda_cr = NULL;
+	mda.mda_uid = UID_ROOT;
+	mda.mda_gid = GID_OPERATOR;
+	mda.mda_mode = 0660;
+	mda.mda_unit = unit;
+	mda.mda_si_drv1 = dev;
+
+	res = make_dev_s(&mda, &(sc->sc_cdev), "spigen%d.%d",
+	    device_get_unit(device_get_parent(dev)), cs);
+	if (res) {
+		return res;
+	}
+
+#ifdef SPIGEN_LEGACY_CDEVNAME
+	res = make_dev_alias_p(0, &sc->sc_adev, sc->sc_cdev, "spigen%d", unit);
+	if (res) {
+		if (sc->sc_cdev) {
+			destroy_dev(sc->sc_cdev);
+			sc->sc_cdev = NULL;
+		}
+		return res;
+	}
+#endif
+
 	spigen_sysctl_init(sc);
 
 	return (0);
@@ -429,8 +464,13 @@
 
 	mtx_destroy(&sc->sc_mtx);
 
-        if (sc->sc_cdev)
-                destroy_dev(sc->sc_cdev);
+#ifdef SPIGEN_LEGACY_CDEVNAME
+	if (sc->sc_adev)
+		destroy_dev(sc->sc_adev);
+#endif
+
+	if (sc->sc_cdev)
+		destroy_dev(sc->sc_cdev);
 	
 	return (0);
 }