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

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Message-ID: <190f2749c6e65fddcd2fd17ebdb45be5a434b869.camel@baylibre.com>
Date:   Thu, 26 Jul 2018 10:48:12 +0200
From:   jbrunet@...libre.com
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        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 23:34 +0200, Martin Blumenstingl wrote:
> On Sat, Jul 21, 2018 at 10:46 PM Jerome Brunet <jbrunet@...libre.com> wrote:
> > 
> > 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 ?
> 
> yes, all are using n = 1

The table proposed in this patch keeps things the way they were before the
change. We could extend the table with these values in a follow up patch.

If those value are with n=1, then I would guess that odd values from 75 to 97
work as well.