linux-kernel - Re: [PATCH v3 22/65] clk: davinci: da8xx-cfgchip: Add a determine

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Message-ID: <ca8efcd8-b2f1-b84d-8087-7f60795f0c0e@lechnology.com>
Date:   Wed, 5 Apr 2023 10:04:04 -0500
From:   David Lechner <david@...hnology.com>
To:     Maxime Ripard <maxime@...no.tech>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Andreas Färber <afaerber@...e.de>,
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        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Luca Ceresoli <luca.ceresoli@...tlin.com>,
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        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
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Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-arm-kernel@...ts.infradead.org,
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Subject: Re: [PATCH v3 22/65] clk: davinci: da8xx-cfgchip: Add a
 determine_rate hook

On 4/4/23 5:11 AM, Maxime Ripard wrote:
> The Davinci DA8xxx cfgchip "clk48" clock implements a mux with a
> set_parent hook, but doesn't provide a determine_rate implementation.
> 
> This is a bit odd, since set_parent() is there to, as its name implies,
> change the parent of a clock. However, the most likely candidate to
> trigger that parent change is a call to clk_set_rate(), with
> determine_rate() figuring out which parent is the best suited for a
> given rate.
> 

As mentioned in my previous review, parent is selected by device
tree and should never be changed after init.