diff --git a/include/asm-avr32/arch-at32ap700x/clk.h b/include/asm-avr32/arch-at32ap700x/clk.h
index 7e20d97..ea84c08 100644
--- a/include/asm-avr32/arch-at32ap700x/clk.h
+++ b/include/asm-avr32/arch-at32ap700x/clk.h
@@ -22,6 +22,8 @@
 #ifndef __ASM_AVR32_ARCH_CLK_H__
 #define __ASM_AVR32_ARCH_CLK_H__
 
+#include <asm/arch/chip-features.h>
+
 #ifdef CONFIG_PLL
 #define MAIN_CLK_RATE ((CFG_OSC0_HZ / CFG_PLL0_DIV) * CFG_PLL0_MUL)
 #else
@@ -50,10 +52,13 @@
 {
 	return get_hsb_clk_rate();
 }
+#ifdef AT32AP700x_CHIP_HAS_USART
 static inline unsigned long get_usart_clk_rate(unsigned int dev_id)
 {
 	return get_pba_clk_rate();
 }
+#endif
+#ifdef AT32AP700x_CHIP_HAS_USART
 static inline unsigned long get_macb_pclk_rate(unsigned int dev_id)
 {
 	return get_pbb_clk_rate();
@@ -62,9 +67,12 @@
 {
 	return get_hsb_clk_rate();
 }
+#endif
+#ifdef AT32AP700x_CHIP_HAS_MMCI
 static inline unsigned long get_mci_clk_rate(void)
 {
 	return get_pbb_clk_rate();
 }
+#endif
 
 #endif /* __ASM_AVR32_ARCH_CLK_H__ */