diff --git a/arch/arm/mach-at91/arm920t/clock.c b/arch/arm/mach-at91/arm920t/clock.c
index 2813bf7..8aa2100 100644
--- a/arch/arm/mach-at91/arm920t/clock.c
+++ b/arch/arm/mach-at91/arm920t/clock.c
@@ -18,6 +18,8 @@
 # error You need to define CONFIG_AT91FAMILY in your board config!
 #endif
 
+#define EN_PLLB_TIMEOUT	500
+
 DECLARE_GLOBAL_DATA_PTR;
 
 static unsigned long at91_css_to_rate(unsigned long css)
@@ -155,3 +157,39 @@
 
 	return 0;
 }
+
+int at91_pllb_clk_enable(u32 pllbr)
+{
+	struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
+	ulong start_time, tmp_time;
+
+	start_time = get_timer(0);
+	writel(pllbr, &pmc->pllbr);
+	while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB) {
+		tmp_time = get_timer(0);
+		if ((tmp_time - start_time) > EN_PLLB_TIMEOUT) {
+			printf("ERROR: failed to enable PLLB\n");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+int at91_pllb_clk_disable(void)
+{
+	struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
+	ulong start_time, tmp_time;
+
+	start_time = get_timer(0);
+	writel(0, &pmc->pllbr);
+	while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != 0) {
+		tmp_time = get_timer(0);
+		if ((tmp_time - start_time) > EN_PLLB_TIMEOUT) {
+			printf("ERROR: failed to disable PLLB\n");
+			return -1;
+		}
+	}
+
+	return 0;
+}
diff --git a/arch/arm/mach-at91/arm926ejs/clock.c b/arch/arm/mach-at91/arm926ejs/clock.c
index c8b5e10..c8d24ae 100644
--- a/arch/arm/mach-at91/arm926ejs/clock.c
+++ b/arch/arm/mach-at91/arm926ejs/clock.c
@@ -18,6 +18,8 @@
 # error You need to define CONFIG_AT91FAMILY in your board config!
 #endif
 
+#define EN_PLLB_TIMEOUT	500
+
 DECLARE_GLOBAL_DATA_PTR;
 
 static unsigned long at91_css_to_rate(unsigned long css)
@@ -242,3 +244,39 @@
 	while (!(readl(&pmc->sr) & AT91_PMC_MCKRDY))
 		;
 }
+
+int at91_pllb_clk_enable(u32 pllbr)
+{
+	struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
+	ulong start_time, tmp_time;
+
+	start_time = get_timer(0);
+	writel(pllbr, &pmc->pllbr);
+	while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB) {
+		tmp_time = get_timer(0);
+		if ((tmp_time - start_time) > EN_PLLB_TIMEOUT) {
+			printf("ERROR: failed to enable PLLB\n");
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+int at91_pllb_clk_disable(void)
+{
+	struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
+	ulong start_time, tmp_time;
+
+	start_time = get_timer(0);
+	writel(0, &pmc->pllbr);
+	while ((readl(&pmc->sr) & AT91_PMC_LOCKB) != 0) {
+		tmp_time = get_timer(0);
+		if ((tmp_time - start_time) > EN_PLLB_TIMEOUT) {
+			printf("ERROR: failed to disable PLLB\n");
+			return -1;
+		}
+	}
+
+	return 0;
+}
diff --git a/arch/arm/mach-at91/include/mach/clk.h b/arch/arm/mach-at91/include/mach/clk.h
index b2604ef..64dec52 100644
--- a/arch/arm/mach-at91/include/mach/clk.h
+++ b/arch/arm/mach-at91/include/mach/clk.h
@@ -133,5 +133,7 @@
 int at91_upll_clk_enable(void);
 int at91_upll_clk_disable(void);
 void at91_usb_clk_init(u32 value);
+int at91_pllb_clk_enable(u32 pllbr);
+int at91_pllb_clk_disable(void);
 
 #endif /* __ASM_ARM_ARCH_CLK_H__ */