linux-kernel - Re: [PATCH] clk: ti: clk-7xx: Correct ABE DPLL configuration

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Message-ID: <533C1AC2.1000307@ti.com>
Date:	Wed, 2 Apr 2014 17:12:18 +0300
From:	Tero Kristo <t-kristo@...com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>,
	Mike Turquette <mturquette@...aro.org>
CC:	Tony Lindgren <tony@...mide.com>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: ti: clk-7xx: Correct ABE DPLL configuration

On 04/02/2014 04:48 PM, Peter Ujfalusi wrote:
> ABE DPLL frequency need to be lowered from 361267200
> to 180633600 to facilitate the ATL requironments.
> The dpll_abe_m2x2_ck clock need to be set to double
> of ABE DPLL rate in order to have correct clocks
> for audio.

Do you have some sort of TRM reference for this?

-Tero

>
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
> ---
>   drivers/clk/ti/clk-7xx.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/clk/ti/clk-7xx.c b/drivers/clk/ti/clk-7xx.c
> index f7e40734c819..19a55bf407dd 100644
> --- a/drivers/clk/ti/clk-7xx.c
> +++ b/drivers/clk/ti/clk-7xx.c
> @@ -16,7 +16,7 @@
>   #include <linux/clkdev.h>
>   #include <linux/clk/ti.h>
>
> -#define DRA7_DPLL_ABE_DEFFREQ				361267200
> +#define DRA7_DPLL_ABE_DEFFREQ				180633600
>   #define DRA7_DPLL_GMAC_DEFFREQ				1000000000
>
>
> @@ -322,6 +322,11 @@ int __init dra7xx_dt_clk_init(void)
>   	if (rc)
>   		pr_err("%s: failed to configure ABE DPLL!\n", __func__);
>
> +	dpll_ck = clk_get_sys(NULL, "dpll_abe_m2x2_ck");
> +	rc = clk_set_rate(dpll_ck, DRA7_DPLL_ABE_DEFFREQ * 2);
> +	if (rc)
> +		pr_err("%s: failed to configure ABE DPLL m2x2!\n", __func__);
> +
>   	dpll_ck = clk_get_sys(NULL, "dpll_gmac_ck");
>   	rc = clk_set_rate(dpll_ck, DRA7_DPLL_GMAC_DEFFREQ);
>   	if (rc)
>

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