diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 5bdc5faac713..a852b379d9eb 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -56,8 +56,7 @@ obj-$(CONFIG_BOOTX_TEXT)	+= btext.o
 obj-$(CONFIG_6xx)		+= idle_6xx.o
 obj-$(CONFIG_SMP)		+= smp.o
 obj-$(CONFIG_KPROBES)		+= kprobes.o
-obj-$(CONFIG_PPC_MULTIPLATFORM) += legacy_serial.o
-obj-$(CONFIG_PPC_MULTIPLATFORM) += udbg_16550.o
+obj-$(CONFIG_SERIAL_8250)	+= legacy_serial.o udbg_16550.o
 module-$(CONFIG_PPC64)		+= module_64.o
 obj-$(CONFIG_MODULES)		+= $(module-y)
 
diff --git a/arch/powerpc/kernel/setup_32.c b/arch/powerpc/kernel/setup_32.c
index 79d434fc14d2..e5d285adb496 100644
--- a/arch/powerpc/kernel/setup_32.c
+++ b/arch/powerpc/kernel/setup_32.c
@@ -299,7 +299,7 @@ void __init setup_arch(char **cmdline_p)
 	if (ppc_md.init_early)
 		ppc_md.init_early();
 
-#ifdef CONFIG_PPC_MULTIPLATFORM
+#ifdef CONFIG_SERIAL_8250
 	find_legacy_serial_ports();
 #endif
 	finish_device_tree();
diff --git a/arch/powerpc/kernel/setup_64.c b/arch/powerpc/kernel/setup_64.c
index 419e0b974b96..98e9f0595dd8 100644
--- a/arch/powerpc/kernel/setup_64.c
+++ b/arch/powerpc/kernel/setup_64.c
@@ -472,7 +472,7 @@ void __init setup_system(void)
 	 * hash table management for us, thus ioremap works. We do that early
 	 * so that further code can be debugged
 	 */
-#ifdef CONFIG_PPC_MULTIPLATFORM
+#ifdef CONFIG_SERIAL_8250
 	find_legacy_serial_ports();
 #endif