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References: <20230807-pll-mipi_set_rate_parent-v6-0-f173239a4b59@oltmanns.dev> <20230807-pll-mipi_set_rate_parent-v6-2-f173239a4b59@oltmanns.dev>
In-Reply-To: <20230807-pll-mipi_set_rate_parent-v6-2-f173239a4b59@oltmanns.dev>
Reply-To: wens@csie.org
From:   Chen-Yu Tsai <wens@csie.org>
Date:   Mon, 7 Aug 2023 22:28:08 +0800
Message-ID: <CAGb2v67YWKbit+F1gOuZ2KFNjcD7NzwwKKpue=f8R2Se8Fg1ag@mail.gmail.com>
Subject: Re: [PATCH v6 02/11] clk: sunxi-ng: nkm: consider alternative parent
 rates when determining rate
To:     Frank Oltmanns <frank@oltmanns.dev>
Cc:     Maxime Ripard <mripard@kernel.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Samuel Holland <samuel@sholland.org>,
        Andre Przywara <andre.przywara@arm.com>,
        Roman Beranek <me@crly.cz>, linux-clk@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev,
        linux-kernel@vger.kernel.org
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On Mon, Aug 7, 2023 at 8:44 PM Frank Oltmanns <frank@oltmanns.dev> 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.
>
> Acked-by: Maxime Ripard <mripard@kernel.org>
> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>

Reviewed-by: Chen-Yu Tsai <wens@csie.org>