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SubjectRe: [PATCH v2 5/6] ARM: AM43xx: clk: Change the cpts ref clock source to dpll_core_m5 clk
On 05/02/2014 09:32 AM, George Cherian wrote:
> cpsw_cpts_rft_clk has got the choice of 3 clocksources
> -dpll_core_m4_ck
> -dpll_core_m5_ck
> -dpll_disp_m2_ck
>
> By default dpll_core_m4_ck is selected, witn this as clock
> source the CPTS doesnot work properly. It gives clockcheck errors
> while running PTP.
>
> clockcheck: clock jumped backward or running slower than expected!
>
> By selecting dpll_core_m5_ck as the clocksource fixes this issue.
> In AM335x dpll_core_m5_ck is the default clocksource.
>
> Signed-off-by: George Cherian <george.cherian@ti.com>

Acked-by: Tero Kristo <t-kristo@ti.com>

> ---
> drivers/clk/ti/clk-43xx.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/drivers/clk/ti/clk-43xx.c b/drivers/clk/ti/clk-43xx.c
> index 67c8de5..b4877e0 100644
> --- a/drivers/clk/ti/clk-43xx.c
> +++ b/drivers/clk/ti/clk-43xx.c
> @@ -110,9 +110,25 @@ static struct ti_dt_clk am43xx_clks[] = {
>
> int __init am43xx_dt_clk_init(void)
> {
> + struct clk *clk1, *clk2;
> +
> ti_dt_clocks_register(am43xx_clks);
>
> omap2_clk_disable_autoidle_all();
>
> + /*
> + * cpsw_cpts_rft_clk has got the choice of 3 clocksources
> + * dpll_core_m4_ck, dpll_core_m5_ck and dpll_disp_m2_ck.
> + * By default dpll_core_m4_ck is selected, witn this as clock
> + * source the CPTS doesnot work properly. It gives clockcheck errors
> + * while running PTP.
> + * clockcheck: clock jumped backward or running slower than expected!
> + * By selecting dpll_core_m5_ck as the clocksource fixes this issue.
> + * In AM335x dpll_core_m5_ck is the default clocksource.
> + */
> + clk1 = clk_get_sys(NULL, "cpsw_cpts_rft_clk");
> + clk2 = clk_get_sys(NULL, "dpll_core_m5_ck");
> + clk_set_parent(clk1, clk2);
> +
> return 0;
> }
>



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