Re: [PATCH v2 2/2] irqchip: Add Qualcomm MPM controller driver

[Marc Zyngier <maz@kernel.org>]

On Tue, 30 Nov 2021 02:31:52 +0000,
Shawn Guo <shawn.guo@linaro.org> wrote:
> 
> + Maulik
> 
> On Mon, Nov 29, 2021 at 03:24:39PM +0000, Marc Zyngier wrote:
> [...]
> > > > > @@ -430,6 +430,14 @@ config QCOM_PDC
> > > > >  	  Power Domain Controller driver to manage and configure wakeup
> > > > >  	  IRQs for Qualcomm Technologies Inc (QTI) mobile chips.
> > > > >  
> > > > > +config QCOM_MPM
> > > > > +	bool "QCOM MPM"
> > > > 
> > > > Can't be built as a module?
> > > 
> > > The driver is implemented as a builtin_platform_driver().
> > 
> > This, on its own, shouldn't preclude the driver from being built as a
> > module. However, the config option only allows it to be built in. Why?
> 
> I just tried to build it as a module, and it seems that "irq_to_desc" is
> only available for built-in build.

Yet another thing that you should not be using. The irqdomain code
gives you everything you need without having to resort to the
internals of the core IRQ infrastructure.

> > Furthermore, why would you look up anywhere other than the wake-up
> > domain? My impression was that only these interrupts would require
> > being re-triggered.
> 
> Both domains have MPM pins that could wake up system.

Then why do you need two domains?

	M.

-- 
Without deviation from the norm, progress is not possible.