1 files changed, 26 insertions, 5 deletions

diff --git a/arch/arm/mach-imx/time.c b/arch/arm/mach-imx/time.c
index bf92e5a351c0..15d18e198303 100644
--- a/arch/arm/mach-imx/time.c
+++ b/arch/arm/mach-imx/time.c
@@ -60,17 +60,22 @@
 #define MX2_TSTAT_CAPT		(1 << 1)
 #define MX2_TSTAT_COMP		(1 << 0)
 
-/* MX31, MX35, MX25, MX5 */
+/* MX31, MX35, MX25, MX5, MX6 */
 #define V2_TCTL_WAITEN		(1 << 3) /* Wait enable mode */
 #define V2_TCTL_CLK_IPG		(1 << 6)
 #define V2_TCTL_CLK_PER		(2 << 6)
+#define V2_TCTL_CLK_OSC_DIV8	(5 << 6)
 #define V2_TCTL_FRR		(1 << 9)
+#define V2_TCTL_24MEN		(1 << 10)
+#define V2_TPRER_PRE24M		12
 #define V2_IR			0x0c
 #define V2_TSTAT		0x08
 #define V2_TSTAT_OF1		(1 << 0)
 #define V2_TCN			0x24
 #define V2_TCMP			0x10
 
+#define V2_TIMER_RATE_OSC_DIV8	3000000
+
 #define timer_is_v1()	(cpu_is_mx1() || cpu_is_mx21() || cpu_is_mx27())
 #define timer_is_v2()	(!timer_is_v1())
 
@@ -312,10 +317,22 @@ static void __init _mxc_timer_init(int irq,
 	__raw_writel(0, timer_base + MXC_TCTL);
 	__raw_writel(0, timer_base + MXC_TPRER); /* see datasheet note */
 
-	if (timer_is_v2())
-		tctl_val = V2_TCTL_CLK_PER | V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
-	else
+	if (timer_is_v2()) {
+		tctl_val = V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
+		if (clk_get_rate(clk_per) == V2_TIMER_RATE_OSC_DIV8) {
+			tctl_val |= V2_TCTL_CLK_OSC_DIV8;
+			if (cpu_is_imx6dl() || cpu_is_imx6sx()) {
+				/* 24 / 8 = 3 MHz */
+				__raw_writel(7 << V2_TPRER_PRE24M,
+					timer_base + MXC_TPRER);
+				tctl_val |= V2_TCTL_24MEN;
+			}
+		} else {
+			tctl_val |= V2_TCTL_CLK_PER;
+		}
+	} else {
 		tctl_val = MX1_2_TCTL_FRR | MX1_2_TCTL_CLK_PCLK1 | MXC_TCTL_TEN;
+	}
 
 	__raw_writel(tctl_val, timer_base + MXC_TCTL);
 
@@ -349,9 +366,13 @@ static void __init mxc_timer_init_dt(struct device_node *np)
 	WARN_ON(!timer_base);
 	irq = irq_of_parse_and_map(np, 0);
 
-	clk_per = of_clk_get_by_name(np, "per");
 	clk_ipg = of_clk_get_by_name(np, "ipg");
 
+	/* Try osc_per first, and fall back to per otherwise */
+	clk_per = of_clk_get_by_name(np, "osc_per");
+	if (IS_ERR(clk_per))
+		clk_per = of_clk_get_by_name(np, "per");
+
 	_mxc_timer_init(irq, clk_per, clk_ipg);
 }
 CLOCKSOURCE_OF_DECLARE(mx1_timer, "fsl,imx1-gpt", mxc_timer_init_dt);