linux-kernel - Re: [PATCH 3/3] clk: meson: clk-pll: drop hard-coded rates from pll tables

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Message-ID: <1532206010.26720.84.camel@baylibre.com>
Date:   Sat, 21 Jul 2018 22:46:50 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-amlogic@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, khilman@...libre.com
Subject: Re: [PATCH 3/3] clk: meson: clk-pll: drop hard-coded rates from pll
 tables

On Sat, 2018-07-21 at 22:16 +0200, Martin Blumenstingl wrote:
> > We could even add ranges instead of table when we know the PLL supports a well-known continuous dividers range.
> 
> I had a look at the sys_pll settings on Meson8b, here's what
> Meson8/Meson8b/Meson8m2 support for sys_pll:
> - 50..74
> - 76
> - 78
> - 80
> - 82
> - 84
> - 86
> - 88
> - 90
> - 92
> - 94
> - 96
> - 98

Are those values with the same predivider (n) value ?
I suspect the ability of the DCO to lock might depends on its input rate and an
m range

So if n change, it might possible that the m range will be different.

... at least, that's my guess :)

> 
> (I'm providing this info because it may help finding a decision
> whether ranges are good or not. I have no preference)