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

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Message-ID: <7379a9c3-3578-5cf1-53ed-ace8ff68434b@manjaro.org>
Date:   Thu, 18 Feb 2021 09:51:54 +0100
From:   Tobias Schramm <t.schramm@...jaro.org>
To:     Maxime Ripard <maxime@...no.tech>,
        Tobias Schramm <t.schramm@...jaro.org>
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 
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