linux-kernel - Re: [PATCH] clk: sunxi-ng: v3s: add support for variable rate audio pll output

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Message-ID: <2e4c479d-0132-2bb8-2bf1-7eec1a8daa08@manjaro.org>
Date:   Thu, 18 Feb 2021 09:53:39 +0100
From:   Tobias Schramm <t.schramm@...jaro.org>
To:     Tobias Schramm <t.schramm@...jaro.org>,
        Maxime Ripard <maxime@...no.tech>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Icenowy Zheng <icenowy@...c.io>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: sunxi-ng: v3s: add support for variable rate audio
 pll output

> Hi Maxime,
>>
>> It's not really clear to me how that would help.
>>
>> The closest frequency we can provide for 24.576MHz would be 24580645 Hz,
>> with N = 127, M = 31 and P = 4, so it would work with what we have
>> already?
>>
> 
> As far as I'm aware the multiplier N ranges from 0 to 128 (offset of 1 
That should have of course been "from 1 to 128".
> from 0 to 127). Thus 24MHz * 128 / 25 / 5 = 24.576MHz. Since this 
> requires the postdiv to be set to 5 it is not supported yet.
> 
> Cheers,
> Tobias