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

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Date:   Tue, 11 Apr 2023 15:30:19 -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 Thu, Mar 30, 2023 at 10:05:37AM -0400, Brian Masney wrote:
> 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.

Just to close out this thread, I submitted a patch to the docs tree.

https://lore.kernel.org/lkml/20230411192153.289688-1-bmasney@redhat.com/T/#u

Brian