Re: [PATCH] regmap: regmap-irq: Make irq-type callbak optional

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

On Fri, Jan 04, 2019 at 11:14:43AM +0000, Charles Keepax wrote:
> On Fri, Jan 04, 2019 at 12:31:15PM +0200, Matti Vaittinen wrote:
> > +	if (num_type_reg)
> > +		d->irq_chip.irq_set_type = regmap_irq_set_type;
> > +
> 
> Afraid this also causes regressions at my end, still having a bit
> of a look but it looks like some how this prevents properties of the
> IRQ getting passed along which causes my system to not probe
> properly with:
> 
> genirq: Flags mismatch irq 58. 00002088 (cs35l35) vs. 00002088 (cs35l35)
> cs35l35 0-0041: Failed to request IRQ: -16
> 

My case is a shared IRQ with 2 amps (cs35l35) connected to a CODEC
(wm8280).

So looks like the issue is if you don't have a set_type callback
then the IRQ ends up as IRQF_TRIGGER_NONE, which causes the
second IRQ to fail the middle check here in __setup_irq:

		if (!((old->flags & new->flags) & IRQF_SHARED) ||
		    (oldtype != (new->flags & IRQF_TRIGGER_MASK)) ||
		    ((old->flags ^ new->flags) & IRQF_ONESHOT)) {

Kinda inclined to just leave the fix as currently submitted and
just drop this patch? But I can do more testing etc. if we want
to push further down this road.

Thanks,
Charles