Re: [PATCH] clk: disable unused clocks registered after boot

[Alexandre Belloni <alexandre.belloni@bootlin.com>]

Hello,

On 17/09/2026 12:01:42-0400, Brian Masney wrote:
> Hi Alexandre,
> 
> On Thu, Sep 17, 2026 at 04:40:10PM +0200, alexandre.belloni@bootlin.com wrote:
> > From: Alexandre Belloni <alexandre.belloni@bootlin.com>
> > 
> > clk_disable_unused() only runs once as a late_initcall, so clocks
> > registered afterwards by loading a module are never checked and may be left
> > running needlessly.
> > 
> > So record when clk_disable_unused has run and afterwards, schedule a
> > delayed work to run the scan when new clocks are registered.
> > 
> > Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
> 
> We're actually in the process of redoing the way clk_disable_unused is
> handled. I posted a series to add sync_state support to the clk
> framework:
> 
> https://lore.kernel.org/linux-clk/20260626-clk-sync-state-v1-0-4156d8196dc8@redhat.com/
> 
> Will you be at Linux Plumbers in Prague in 2.5 weeks? If so, come to
> this talk where we will talk about the clk subsystem.
> 
>     Evolving support for sync_state to subsystems beyond genpd 
>     https://lpc.events/event/20/contributions/2504/
> 

I will be at plumbers and I'll try to attend, thanks!

For reference, this is the reason for the patch:
https://lore.kernel.org/all/2ce03d3b4cd9cce8e32fe1fe1ffbea5760bf9ef3.camel@siemens.com/

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com