diff --git a/sys/dev/firmware/arm/scmi.h b/sys/dev/firmware/arm/scmi.h
--- a/sys/dev/firmware/arm/scmi.h
+++ b/sys/dev/firmware/arm/scmi.h
@@ -32,6 +32,8 @@
 #ifndef	_ARM64_SCMI_SCMI_H_
 #define	_ARM64_SCMI_SCMI_H_
 
+#include <sys/sysctl.h>
+
 #include "scmi_if.h"
 
 #define SCMI_DEF_MAX_MSG		32
@@ -64,6 +66,7 @@
 	struct mtx			mtx;
 	struct scmi_transport_desc	trs_desc;
 	struct scmi_transport		*trs;
+	struct sysctl_oid		*sysctl_root;
 };
 
 struct scmi_msg {
diff --git a/sys/dev/firmware/arm/scmi.c b/sys/dev/firmware/arm/scmi.c
--- a/sys/dev/firmware/arm/scmi.c
+++ b/sys/dev/firmware/arm/scmi.c
@@ -44,6 +44,7 @@
 #include <sys/queue.h>
 #include <sys/refcount.h>
 #include <sys/sdt.h>
+#include <sys/sysctl.h>
 #include <sys/taskqueue.h>
 
 #include <dev/clk/clk.h>
@@ -189,6 +190,7 @@
 int
 scmi_attach(device_t dev)
 {
+	struct sysctl_oid *sysctl_trans;
 	struct scmi_softc *sc;
 	phandle_t node;
 	int error;
@@ -209,6 +211,17 @@
 	device_printf(dev, "Transport - max_msg:%d  max_payld_sz:%lu  reply_timo_ms:%d\n",
 	    SCMI_MAX_MSG(sc), SCMI_MAX_MSG_PAYLD_SIZE(sc), SCMI_MAX_MSG_TIMEOUT_MS(sc));
 
+	sc->sysctl_root = SYSCTL_ADD_NODE(NULL, SYSCTL_STATIC_CHILDREN(_hw),
+	    OID_AUTO, "scmi", CTLFLAG_RD, 0, "SCMI root");
+	sysctl_trans = SYSCTL_ADD_NODE(NULL, SYSCTL_CHILDREN(sc->sysctl_root),
+	    OID_AUTO, "transport", CTLFLAG_RD, 0, "SCMI Transport properties");
+	SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(sysctl_trans), OID_AUTO, "max_msg",
+	    CTLFLAG_RD, &sc->trs_desc.max_msg, 0, "SCMI Max number of inflight messages");
+	SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(sysctl_trans), OID_AUTO, "max_msg_size",
+	    CTLFLAG_RD, &sc->trs_desc.max_payld_sz, 0, "SCMI Max message payload size");
+	SYSCTL_ADD_INT(NULL, SYSCTL_CHILDREN(sysctl_trans), OID_AUTO, "max_rx_timeout_ms",
+	    CTLFLAG_RD, &sc->trs_desc.reply_timo_ms, 0, "SCMI Max message RX timeout ms");
+
 	/*
 	 * Allow devices to identify.
 	 */