Re: [PATCH 1/4] CLK: ti: dra7: Initialize USB_DPLL

Nishanth Menon
2013-08-01T15:06:30Z

On 08/01/2013 09:58 AM, 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.
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
> drivers/clk/omap/clk-7xx.c | 11 +++++++++++
> 1 files changed, 11 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/clk/omap/clk-7xx.c b/drivers/clk/omap/clk-7xx.c
> index ddb39dd..f444513 100644
> --- a/drivers/clk/omap/clk-7xx.c
> +++ b/drivers/clk/omap/clk-7xx.c
> @@ -19,6 +19,7 @@
>
> #define DRA7_DPLL_ABE_DEFFREQ 361267200
> #define DRA7_DPLL_GMAC_DEFFREQ 1000000000
> +#define DRA7_DPLL_USB_DEFFREQ 960000000
>
>
> static struct omap_dt_clk dra7xx_clks[] = {
> @@ -63,5 +64,15 @@ int __init dra7xx_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__);
> +
> return rc;
> }
>
As I had mentioned on [1] - we are going to see similar needs keep
popping up. there is no need to hack this up for even more peripherals :(

http://marc.info/?l=linux-omap&m=137536803106017&w=2

--
Regards,
Nishanth Menon