linux-kernel - Re: Question on pre running clocks

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Message-ID: <CAKZGPAMj6umUvoc+supfTU4juGoUXw78UiveUJgZQFE_ErdGbg@mail.gmail.com>
Date:   Fri, 20 Oct 2023 12:39:05 +0530
From:   Arun KS <arunks.linux@...il.com>
To:     linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org
Cc:     sboyd@...nel.org, mturquette@...libre.com,
        Arun KS <getarunks@...il.com>
Subject: Re: Question on pre running clocks

+ linux-clk

On Fri, Oct 20, 2023 at 12:37 PM Arun KS <arunks.linux@...il.com> wrote:
>
> Hello,
>
> Lets say there is a clock which is enabled by bootloaders and is pre
> running as linux boots.
> Is it mandatory for the client drivers to call clk_prepare_enable() on
> them to initialise the enable_count to 1?
>
> Or is there a way we can specify to the kernel that this clock is
> already enabled by bootloader and initialise the enable_count for this
> clock to 1.
>
> Because otherwise, clk_disable() prints a WARN() if a client driver
> uses clock handle where clk_prepare_enable() is not called.
>
> I grep through the code, but could find any details. Appreciate any pointers.
>
> Regards,
> Arun