linux-kernel - Re: [PATCH v2 1/2] clk: sunxi-ng: nkm: consider alternative parent rates when finding rate

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Message-ID: <oo534q7hgmves7pd665ut356xpksw7oonrjk22tu4h4mg6mwhd@dwoc5a5c5wn3>
Date:   Mon, 12 Jun 2023 14:21:01 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Frank Oltmanns <frank@...manns.dev>
Cc:     Andre Przywara <andre.przywara@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Roman Beranek <me@...y.cz>,
        Samuel Holland <samuel@...lland.org>,
        Stephen Boyd <sboyd@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH v2 1/2] clk: sunxi-ng: nkm: consider alternative parent
 rates when finding rate

Hi,

On Sun, Jun 11, 2023 at 11:01:42AM +0200, Frank Oltmanns wrote:
> In case the CLK_SET_RATE_PARENT flag is set, consider using a different
> parent rate when determining a new rate.
> 
> To find the best match for the requested rate, perform the following
> steps for each NKM combination:
>  - calculate the optimal parent rate,
>  - find the best parent rate that the parent clock actually supports
>  - use that parent rate to calculate the effective rate.
> 
> In case the clk does not support setting the parent rate, use the same
> algorithm as before.
> 
> Signed-off-by: Frank Oltmanns <frank@...manns.dev>

Most of the comments I had on v1 still apply there, so let's figure them
out before sending a v3.

Maxime

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