1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/cclock44xx_data.c b/arch/arm/mach-omap2/cclock44xx_data.c
index 3d58f335f173..0c6834ae1fc4 100644
--- a/arch/arm/mach-omap2/cclock44xx_data.c
+++ b/arch/arm/mach-omap2/cclock44xx_data.c
@@ -52,6 +52,13 @@
  */
 #define OMAP4_DPLL_ABE_DEFFREQ                          98304000
 
+/*
+ * OMAP4 USB DPLL default frequency. In OMAP4430 TRM version V, section
+ * "3.6.3.9.5 DPLL_USB Preferred Settings" shows that the preferred
+ * locked frequency for the USB DPLL is 960MHz.
+ */
+#define OMAP4_DPLL_USB_DEFFREQ                          960000000
+
 /* Root clocks */
 
 DEFINE_CLK_FIXED_RATE(extalt_clkin_ck, CLK_IS_ROOT, 59000000, 0x0);
@@ -1011,6 +1018,10 @@ DEFINE_CLK_OMAP_MUX(hsmmc2_fclk, "l3_init_clkdm", hsmmc1_fclk_sel,
                     OMAP4430_CM_L3INIT_MMC2_CLKCTRL, OMAP4430_CLKSEL_MASK,
                     hsmmc1_fclk_parents, func_dmic_abe_gfclk_ops);
 
+DEFINE_CLK_GATE(ocp2scp_usb_phy_phy_48m, "func_48m_fclk", &func_48m_fclk, 0x0,
+                OMAP4430_CM_L3INIT_USBPHYOCP2SCP_CLKCTRL,
+                OMAP4430_OPTFCLKEN_PHY_48M_SHIFT, 0x0, NULL);
+
 DEFINE_CLK_GATE(sha2md5_fck, "l3_div_ck", &l3_div_ck, 0x0,
                 OMAP4430_CM_L4SEC_SHA2MD51_CLKCTRL,
                 OMAP4430_MODULEMODE_SWCTRL_SHIFT, 0x0, NULL);
@@ -1538,6 +1549,7 @@ static struct omap_clk omap44xx_clks[] = {
         CLK(NULL,       "per_mcbsp4_gfclk",                     &per_mcbsp4_gfclk,      CK_443X),
         CLK(NULL,       "hsmmc1_fclk",                  &hsmmc1_fclk,   CK_443X),
         CLK(NULL,       "hsmmc2_fclk",                  &hsmmc2_fclk,   CK_443X),
+        CLK(NULL,       "ocp2scp_usb_phy_phy_48m",      &ocp2scp_usb_phy_phy_48m,       CK_443X),
         CLK(NULL,       "sha2md5_fck",                  &sha2md5_fck,   CK_443X),
         CLK(NULL,       "slimbus1_fclk_1",              &slimbus1_fclk_1,       CK_443X),
         CLK(NULL,       "slimbus1_fclk_0",              &slimbus1_fclk_0,       CK_443X),
@@ -1705,5 +1717,13 @@ int __init omap4xxx_clk_init(void)
         if (rc)
                 pr_err("%s: failed to configure ABE DPLL!\n", __func__);
 
+        /*
+         * Lock USB DPLL on OMAP4 devices so that the L3INIT power
+         * domain can transition to retention state when not in use.
+         */
+        rc = clk_set_rate(&dpll_usb_ck, OMAP4_DPLL_USB_DEFFREQ);
+        if (rc)
+                pr_err("%s: failed to configure USB DPLL!\n", __func__);
+
         return 0;
 }