linux-kernel - Re: [PATCH 3/6] clk: mediatek: mt8192: Do not re-register top_early

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Date:   Fri, 30 Sep 2022 15:09:24 +0800
From:   Miles Chen <miles.chen@...iatek.com>
To:     <wenst@...omium.org>
CC:     <angelogioacchino.delregno@...labora.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-clk@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <matthias.bgg@...il.com>,
        <miles.chen@...iatek.com>, <mturquette@...libre.com>,
        <sboyd@...nel.org>
Subject: Re: [PATCH 3/6] clk: mediatek: mt8192: Do not re-register top_early_divs in probe function

>On Wed, Sep 28, 2022 at 9:55 AM Miles Chen <miles.chen@...iatek.com> wrote:
>>
>> >> top_early_divs are registered in the CLK_OF_DECLARE_DRIVER() half of the
>> >> topckgen clk driver. Don't try to register it again in the actual probe
>> >> function. This gets rid of the "Trying to register duplicate clock ..."
>> >> warning.
>> >>
>> >> Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
>> >
>> >Can't we simply remove the CLK_OF_DECLARE_DRIVER() and top_init_early entirely,
>> >and transfer TOP_CSW_F26M_D2 to top_divs[] instead?
>> >I get that systimer concern and we have something similar in MT8195, where the
>> >TOP_CLK26M_D2 is registered "late".
>>
>> Another reason for this:
>> Removing the CLK_OF_DECLARE_DRIVER() is good when we want to build our driver as
>> kernel modules because it does not work with kernel modules.
>
>I agree. But as I mentioned in my other reply, we need to fix the clock
>user first before dropping that clock. And there's also the matter of
>DT backward compatibility. So we need to do it incrementally.
>
>
>ChenYu

Got it. thanks for doing this.

thanks,
Miles