linux-kernel - Re: [PATCH] clk: add debug message showing which unused clocks are disabled on boot

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Date:   Thu, 30 Mar 2023 10:05:37 -0400
From:   Brian Masney <bmasney@...hat.com>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     mturquette@...libre.com, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: add debug message showing which unused clocks are
 disabled on boot

On Wed, Mar 29, 2023 at 02:49:50PM -0700, Stephen Boyd wrote:
> Quoting Brian Masney (2022-11-17 02:58:29)
> > The clk framework on bootup will automatically disable all unused clocks
> > on bootup unless the clk_ignore_unused kernel parameter is present.
> > Let's add a basic debugging log statement here that shows which clocks
> > are disabled. There is already tracepoint present here as well, but
> > there's nothing like a simple, good ol' fashioned printk for simplicity.
> > 
> > Signed-off-by: Brian Masney <bmasney@...hat.com>
> > ---
> 
> I'd like to see a documentation update instead that covers how to enable
> the tracepoint on the kernel commandline and have it print to the serial
> console.

Sure, I can do that. I see there's a section 'Disabling clock gating of
unused clocks' in Documentation/driver-api/clk.rst where I think this
would be appropriate.

Brian