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
@@ -128,8 +128,8 @@
 };
 
 static int		scmi_transport_configure(device_t,
-			    struct scmi_transport_desc *);
-static int		scmi_transport_init(struct scmi_softc *);
+			    struct scmi_transport_desc *, phandle_t);
+static int		scmi_transport_init(struct scmi_softc *, phandle_t);
 static void		scmi_transport_cleanup(struct scmi_softc *);
 static struct scmi_reqs_pool *scmi_reqs_pool_allocate(const int, const int);
 static void		scmi_reqs_pool_free(struct scmi_reqs_pool *);
@@ -167,7 +167,7 @@
 
 	simplebus_init(dev, node);
 
-	error = scmi_transport_init(sc);
+	error = scmi_transport_init(sc, node);
 	if (error != 0)
 		return (error);
 
@@ -251,19 +251,35 @@
 }
 
 static int
-scmi_transport_configure(device_t dev, struct scmi_transport_desc *tdesc)
+scmi_transport_configure(device_t dev, struct scmi_transport_desc *tdesc, phandle_t node)
 {
+	int  ret;
+
 	/* Initialize to default values at first ... */
 	tdesc->max_msg = SCMI_DEF_MAX_MSG;
 	tdesc->max_payld_sz = SCMI_DEF_MAX_MSG_PAYLD_SIZE;
 	tdesc->reply_timo_ms = SCMI_DEF_MAX_RX_TIMEOUT_MS;
 
+	/*...lookup any optional DT properties*/
+	OF_getencprop(node, "arm,max-msg", &tdesc->max_msg,
+	    sizeof(tdesc->max_msg));
+	OF_getencprop(node, "arm,max-msg-size", &tdesc->max_payld_sz,
+	    sizeof(tdesc->max_payld_sz));
+
 	/* ... check against per-transport needs */
-	return SCMI_TRANSPORT_CONFIGURE(dev);
+	ret = SCMI_TRANSPORT_CONFIGURE(dev);
+	if (ret != 0)
+		return (ret);
+
+	/* optional max_timeout should NOT be overwritten by trasnport defaults */
+	OF_getencprop(node, "arm,max-rx-timeout-ms", &tdesc->reply_timo_ms,
+	    sizeof(tdesc->reply_timo_ms));
+
+	return (ret);
 }
 
 static int
-scmi_transport_init(struct scmi_softc *sc)
+scmi_transport_init(struct scmi_softc *sc, phandle_t node)
 {
 	struct scmi_transport_desc *tdesc = &sc->trs_desc;
 	struct scmi_transport *trs;
@@ -272,7 +288,7 @@
 	trs = malloc(sizeof(*trs), M_DEVBUF, M_ZERO | M_WAITOK);
 	sc->trs = trs;
 
-	ret = scmi_transport_configure(sc->dev, tdesc);
+	ret = scmi_transport_configure(sc->dev, tdesc, node);
 	if (ret != 0) {
 		free(trs, M_DEVBUF);
 		return (ret);
@@ -308,6 +324,7 @@
 
 	return (0);
 }
+
 static void
 scmi_transport_cleanup(struct scmi_softc *sc)
 {