On 03/07/2014 03:09 PM, Roger Quadros wrote:
USB_DPLL must be initialized and locked at boot so that
USB modules can work.
Also program USB_DLL_M2 output to half rate.
CC: Mike Turquette <mturquette@xxxxxxxxxx>
CC: Tero Kristo <t-kristo@xxxxxx>
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
---
drivers/clk/ti/clk-7xx.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/clk/ti/clk-7xx.c b/drivers/clk/ti/clk-7xx.c
index 9977653..f89f3c2 100644
--- a/drivers/clk/ti/clk-7xx.c
+++ b/drivers/clk/ti/clk-7xx.c
@@ -18,6 +18,7 @@
#define DRA7_DPLL_ABE_DEFFREQ 361267200
#define DRA7_DPLL_GMAC_DEFFREQ 1000000000
+#define DRA7_DPLL_USB_DEFFREQ 960000000
static struct ti_dt_clk dra7xx_clks[] = {
@@ -328,5 +329,15 @@ int __init dra7xx_dt_clk_init(void)
if (rc)
pr_err("%s: failed to configure GMAC DPLL!\n", __func__);
+ dpll_ck = clk_get_sys(NULL, "dpll_usb_ck");
+ rc = clk_set_rate(dpll_ck, DRA7_DPLL_USB_DEFFREQ);
+ if (rc)
+ pr_err("%s: failed to configure USB DPLL!\n", __func__);
+
+ dpll_ck = clk_get_sys(NULL, "dpll_usb_m2_ck");
+ rc = clk_set_rate(dpll_ck, DRA7_DPLL_USB_DEFFREQ/2);
+ if (rc)
+ pr_err("%s: failed to set USB_DPLL M2 OUT\n", __func__);
+
I would rather see this done using the default-rate mechanism provided here:
https://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg101300.html
However, this remains to be commented by Mike whether the patch is okay
or not.
-Tero
return rc;
}
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