linux-kernel - Re: [PATCH 1/3] clk: exynos5433: Extend list of available AUD

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Date:   Tue, 06 Feb 2018 11:44:50 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Sylwester Nawrocki <s.nawrocki@...sung.com>,
        linux-clk@...r.kernel.org
Cc:     sboyd@...eaurora.org, mturquette@...libre.com,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, b.zolnierkie@...sung.com,
        m.szyprowski@...sung.com
Subject: Re: [PATCH 1/3] clk: exynos5433: Extend list of available AUD_PLL
 output frequencies

Hi Sylwester,

When I developed the clk-exynos5433.c I referred to the following description.
TRM specified that "Samsung recommends only the values
between 252MH ~ 400MHz in the PMS2460X PMS value" for aud_pll.

It looks like that you refer to clk-exynos5420.c driver.
But, I'm wondering exynos5433 might not guarantee the additional clock
of this patch as the stable clock.

On 2018년 02월 05일 23:22, Sylwester Nawrocki wrote:
> Add more definitions to the exynos5433_aud_pll_rates table so the
> AUD_PLL can be used as a root clock source for the I2S1 and the HDMI
> interface.
> 
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
> ---
>  drivers/clk/samsung/clk-exynos5433.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/clk/samsung/clk-exynos5433.c b/drivers/clk/samsung/clk-exynos5433.c
> index db270908037a..74b70ddab4d6 100644
> --- a/drivers/clk/samsung/clk-exynos5433.c
> +++ b/drivers/clk/samsung/clk-exynos5433.c
> @@ -765,6 +765,14 @@ static const struct samsung_pll_rate_table exynos5433_aud_pll_rates[] __initcons
>  	PLL_36XX_RATE(294912000U,  98, 1, 3,  19923),
>  	PLL_36XX_RATE(288000000U,  96, 1, 3,      0),
>  	PLL_36XX_RATE(252000000U,  84, 1, 3,      0),
> +	PLL_36XX_RATE(200000000U, 200, 3, 3,      0),
> +	PLL_36XX_RATE(196608001U, 197, 3, 3, -25690),
> +	PLL_36XX_RATE(180633609U, 301, 5, 3,   3671),
> +	PLL_36XX_RATE(131072006U, 131, 3, 3,   4719),
> +	PLL_36XX_RATE(100000000U, 200, 3, 4,      0),
> +	PLL_36XX_RATE(65536003U,  131, 3, 4,   4719),
> +	PLL_36XX_RATE(49152000U,  197, 3, 5, -25690),
> +	PLL_36XX_RATE(32768001U,  131, 3, 5,   4719),
>  	{ /* sentinel */ }
>  };
> 
> --
> 2.14.2
> 
> 
> 

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics