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[PATCHv11,22/49] CLK: TI: omap5: Initialize USB_DPLL at boot

Message ID 1387452260-23276-23-git-send-email-t-kristo@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Tero Kristo Dec. 19, 2013, 11:23 a.m. UTC 
From: Roger Quadros <rogerq@ti.com>

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

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

diff --git a/drivers/clk/ti/clk-54xx.c b/drivers/clk/ti/clk-54xx.c
index c876e6e..0ef9f58 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;
 
 	ti_dt_clocks_register(omap54xx_clks);
 
@@ -235,5 +241,15 @@  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;
 }