Re: [PATCH] clk: samsung: exynos5420: The EPLL rate table corrections
From: Stephen Boyd
Date: Mon Jul 31 2017 - 16:17:24 EST
On 07/21, Sylwester Nawrocki wrote:
> This patch fixes values of the EPLL K coefficient and changes
> the EPLL output frequency values to match exactly what is
> possible to achieve with given M, P, S, K coefficients.
> This allows to avoid rounding errors and unexpected frequency
> being set with clk_set_rate(), due to recalc_rate returning
> different values than the PLL rate specified in the
> exynos5420_epll_24mhz_tbl table. E.g. this prevents a case
> where two consecutive clk_set_rate() calls with same argument
> result in different PLL output frequency.
>
> The PLL output frequencies have been calculated with formula:
>
> f = fxtal * (M * 2^16 + K) / (P * 2^S) / 2^16
>
> where fxtal = 24000000.
>
> Fixes: 9842452acd ("clk: samsung: exynos542x: Add EPLL rate table")
> Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
> ---
Applied to clk-fixes
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