[PATCHv8 15/36] CLK: TI: omap5: Initialize USB_DPLL at boot

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Roger Quadros <rogerq@xxxxxx>

USB_DPLL must be initialized and locked at boot so that
USB modules can work.

Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
Tested-by: Nishanth Menon <nm@xxxxxx>
Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
---
 drivers/clk/ti/clk-54xx.c |   18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/ti/clk-54xx.c b/drivers/clk/ti/clk-54xx.c
index 87e6ab3..ba2e387 100644
--- a/drivers/clk/ti/clk-54xx.c
+++ b/drivers/clk/ti/clk-54xx.c
@@ -19,6 +19,12 @@
 
 #define OMAP5_DPLL_ABE_DEFFREQ				98304000
 
+/*
+ * OMAP543x TRM, section "3.6.3.9.5 DPLL_USB Preferred Settings"
+ * states it must be at 960MHz
+ */
+#define OMAP5_DPLL_USB_DEFFREQ				960000000
+
 static struct ti_dt_clk omap54xx_clks[] = {
 	DT_CLK(NULL, "pad_clks_src_ck", "pad_clks_src_ck"),
 	DT_CLK(NULL, "pad_clks_ck", "pad_clks_ck"),
@@ -220,7 +226,7 @@ static struct ti_dt_clk omap54xx_clks[] = {
 int __init omap5xxx_dt_clk_init(void)
 {
 	int rc;
-	struct clk *abe_dpll_ref, *abe_dpll, *sys_32k_ck;
+	struct clk *abe_dpll_ref, *abe_dpll, *sys_32k_ck, *usb_dpll;
 
 	of_clk_init(NULL);
 
@@ -237,5 +243,15 @@ int __init omap5xxx_dt_clk_init(void)
 	if (rc)
 		pr_err("%s: failed to configure ABE DPLL!\n", __func__);
 
+	usb_dpll = clk_get_sys(NULL, "dpll_usb_ck");
+	rc = clk_set_rate(usb_dpll, OMAP5_DPLL_USB_DEFFREQ);
+	if (rc)
+		pr_err("%s: failed to configure USB DPLL!\n", __func__);
+
+	usb_dpll = clk_get_sys(NULL, "dpll_usb_m2_ck");
+	rc = clk_set_rate(usb_dpll, OMAP5_DPLL_USB_DEFFREQ/2);
+	if (rc)
+		pr_err("%s: failed to set USB_DPLL M2 OUT\n", __func__);
+
 	return 0;
 }
-- 
1.7.9.5

--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [Linux Arm (vger)]     [ARM Kernel]     [ARM MSM]     [Linux Tegra]     [Linux WPAN Networking]     [Linux Wireless Networking]     [Maemo Users]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux