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

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Message-ID: <20210218094426.fc5pxmz463fivm2w@gilmour>
Date:   Thu, 18 Feb 2021 10:44:26 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Tobias Schramm <t.schramm@...jaro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, 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

On Thu, Feb 18, 2021 at 05:21:16PM +0800, Icenowy Zheng wrote:
> 
> 
> 于 2021年2月18日 GMT+08:00 下午5:18:39, Tobias Schramm <t.schramm@...jaro.org> 写到:
> >Hi Icenowy,
> >
> > > We have introducee SDM-based accurate audio PLL on several
> >> other SoCs. Some people is quite sensitive about audio-related
> >things.
> > >
> >While it is possible to support 24MHz * 128 / 25 / 5 = 24.576MHz
> >without 
> >delta sigma modulation, matching 22.5792MHz is indeed not possible. I 
> >read you'd prefer me to use SDM like the other SoCs though? Shall I
> >send 
> >a v2 utilizing SDM?
> 
> Yes, I think so.

Yes I'd rather have consistency about how we deal with this across all SoCs

Maxime

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