Index: sys/dev/uart/uart_cpu_powerpc.c
===================================================================
--- sys/dev/uart/uart_cpu_powerpc.c
+++ sys/dev/uart/uart_cpu_powerpc.c
@@ -35,6 +35,7 @@
 #include <machine/bus.h>
 #include <machine/ofw_machdep.h>
 
+#include <dev/fdt/fdt_common.h>
 #include <dev/ofw/openfirm.h>
 #include <dev/uart/uart.h>
 #include <dev/uart/uart_cpu.h>
@@ -166,11 +167,12 @@
 	if (OF_getprop(input, "compatible", buf, sizeof(buf)) == -1)
 		return (ENXIO);
 
-	if (strncmp(buf, "chrp,es", 7) == 0) {
+	if (fdt_is_compatible(input, "chrp,es")) {
 		class = &uart_z8530_class;
 		di->bas.regshft = 4;
 		di->bas.chan = 1;
-	} else if (strcmp(buf,"ns16550") == 0 || strcmp(buf,"ns8250") == 0) {
+	} else if (fdt_is_compatible(input,"ns16550") ||
+	    fdt_is_compatible(input,"ns8250")) {
 		class = &uart_ns8250_class;
 		di->bas.regshft = 0;
 		di->bas.chan = 0;