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Date:   Fri, 15 Oct 2021 16:36:31 +0200
From:   Sylwester Nawrocki <>
To:     Stephen Boyd <>,
        Will McVicker <>
Cc:     Chanwoo Choi <>,
        Krzysztof Kozlowski <>,
        Michael Turquette <>,
        Sylwester Nawrocki <>,
        Tomasz Figa <>,
        Android Kernel <>,
        linux-samsung-soc <>,
        linux-clk <>,
        Linux Kernel Mailing List <>,
        Linux ARM <>
Subject: Re: [PATCH v3 1/2] [RFT] clk: samsung: add support for CPU clocks

On 14.10.2021 23:40, Stephen Boyd wrote:
> Quoting Will McVicker (2021-10-14 12:35:57)
>> On Wed, Oct 13, 2021 at 6:49 PM Stephen Boyd <> wrote:
>>> Quoting Will McVicker (2021-10-13 15:10:19)
>>>> diff --git a/drivers/clk/samsung/clk-cpu.c b/drivers/clk/samsung/clk-cpu.c

>>>> +               if (parent_clk)
>>>> +                       parent_clk_hw = __clk_get_hw(parent_clk);
>>>> +               alt_parent_clk = __clk_lookup(list->alt_parent_name);
>>> Can the DT binding be updated?
>> Are you referring to removing alt_parent and just adding it as another
>> parent clock?
> I was wondering if this is an external clk that feeds into here or if it
> is all internal to the clk controller. It sounds like it's all internal
> to the clk controller? In which case a binding update isn't needed.

Yes, I double checked and the cpu parent clocks are always internal to
the clock provider. There is one exception where physically a parent clock
comes from other CMU (exynos5250), but in that case all CMUs are modeled
as a single clk provider anyway. Thus we don't need a binding update.

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