Re: [PATCH] soundwire: bus: Make IRQ handling conditionally built

[Charles Keepax <ckeepax@opensource.cirrus.com>]

On Wed, Sep 20, 2023 at 09:05:13AM +0200, Vinod Koul wrote:
> On 18-09-23, 17:10, Charles Keepax wrote:
> > SoundWire has provisions for a simple callback for the IRQ handling so
> > has no hard dependency on IRQ_DOMAIN, but the recent addition of IRQ
> > handling was causing builds without IRQ_DOMAIN to fail. Resolve this by
> > moving the IRQ handling into its own file and only add it to the build
> > when IRQ_DOMAIN is included in the kernel.
> > 
> > Fixes: 12a95123bfe1 ("soundwire: bus: Allow SoundWire peripherals to register IRQ handlers")
> > Reported-by: kernel test robot <lkp@intel.com>
> > Closes: https://lore.kernel.org/oe-kbuild-all/202309150522.MoKeF4jx-lkp@intel.com/
> > Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
> > ---
> >  drivers/soundwire/Makefile   |  4 +++
> >  drivers/soundwire/bus.c      | 31 +++----------------
> >  drivers/soundwire/bus_type.c | 11 +++----
> >  drivers/soundwire/irq.c      | 59 ++++++++++++++++++++++++++++++++++++
> >  drivers/soundwire/irq.h      | 43 ++++++++++++++++++++++++++
> >  5 files changed, 115 insertions(+), 33 deletions(-)
> >  create mode 100644 drivers/soundwire/irq.c
> >  create mode 100644 drivers/soundwire/irq.h
> > 
> > diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile
> > index c3d3ab3262d3a..657f5888a77b0 100644
> > --- a/drivers/soundwire/Makefile
> > +++ b/drivers/soundwire/Makefile
> > @@ -15,6 +15,10 @@ ifdef CONFIG_DEBUG_FS
> >  soundwire-bus-y += debugfs.o
> >  endif
> >  
> > +ifdef CONFIG_IRQ_DOMAIN
> > +soundwire-bus-y += irq.o
> > +endif
> 
> Any reason why we cant use depends for this?
> 

No reason we can't, but my thinking was really that SoundWire doesn't
really have a dependency on IRQ_DOMAIN, as you can use the original
callback mechanism. It seemed a shame to force it as a dependency,
when the whole subsystem can function happily without it.

That said, I am happy to switch to a simple dependency if you prefer?
It would certainly be a much simpler change.

Thanks,
Charles