-#define KE_OSC_SEL_EXT (1 << 0)
-#define KE_OSC_SEL_4MHZ (2 << 0)
-#define KE_OSC_SEL_20MHZ (3 << 0)
+#define KE_OSC_SEL_CLK(x) (((x) & 0x3) << 0)
+#define KE_OSC_SEL_EXT KE_OSC_SEL_CLK(1)
+#define KE_OSC_SEL_4MHZ KE_OSC_SEL_CLK(2)
+#define KE_OSC_SEL_20MHZ KE_OSC_SEL_CLK(3)