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

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Message-id: <086b44d2-6556-fa7c-1a5b-01c243bf0682@samsung.com>
Date:   Wed, 07 Feb 2018 14:04:18 +0100
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     linux-clk@...r.kernel.org, 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

On 02/07/2018 12:24 PM, Chanwoo Choi wrote:
> Could you share your equation?
> because your result is a little bit different of my result.
> - my equation : ((mdiv + kdiv/65535) x 24MHz) / (pdiv x POWER(2,sdiv))

It resembles the code from samsung_pll36xx_recalc_rate():

(24 * 10^6 * (M * 2^16 + K)) / (P * 2^S) / 2^16

and a more accurate one

ROUNDDOWN(ROUNDDOWN(24 * 10^6 * (M * 2^16 + K), 0) / ROUNDDOWN(P * 2^S, 0) / 2^16, 0)

Shouldn't you substitute 65535 with 65536?

-- 
Regards,
Sylwester