diff --git a/sys/dev/tpm/tpm_bus.c b/sys/dev/tpm/tpm_bus.c
--- a/sys/dev/tpm/tpm_bus.c
+++ b/sys/dev/tpm/tpm_bus.c
@@ -77,7 +77,7 @@
 }
 
 static void
-tpm_write_barrier(device_t dev, bus_addr_t off, bus_size_t length)
+tpm_write_barrier(device_t dev, bus_size_t off, bus_size_t length)
 {
 	struct tpm_sc *sc = device_get_softc(dev);
 
diff --git a/sys/dev/tpm/tpm_if.m b/sys/dev/tpm/tpm_if.m
--- a/sys/dev/tpm/tpm_if.m
+++ b/sys/dev/tpm/tpm_if.m
@@ -41,7 +41,7 @@
 
 METHOD uint64_t read_8 {
 	device_t dev;
-	bus_addr_t addr;
+	bus_size_t addr;
 }
 
 #
@@ -49,28 +49,28 @@
 #
 METHOD uint32_t read_4 {
 	device_t dev;
-	bus_addr_t addr;
+	bus_size_t addr;
 };
 
 METHOD uint8_t read_1 {
 	device_t dev;
-	bus_addr_t addr;
+	bus_size_t addr;
 };
 
 METHOD void write_4 {
 	device_t dev;
-	bus_addr_t addr;
+	bus_size_t addr;
 	uint32_t value;
 };
 
 METHOD void write_1 {
 	device_t dev;
-	bus_addr_t addr;
+	bus_size_t addr;
 	uint8_t value;
 };
 
 METHOD void write_barrier {
 	device_t dev;
-	bus_addr_t off;
+	bus_size_t off;
 	bus_size_t length;
 }