# Re: \[PATCH\] ASoC: fsl\_sai: add IRQF\_SHARED

- From: Daniel Baluta \<hidden\>
- Date: 2019-12-05 09:45:48 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2019/12/5796219
- Thread: https://ratatoskr.run/alsa-devel/2019/11/5791421/t.md

```text
On Thu, Dec 5, 2019 at 11:18 AM Michael Walle [ref] wrote:
>
> Hi Daniel,
>
> Am 2019-12-05 09:43, schrieb Daniel Baluta:
> > On Fri, Nov 29, 2019 at 12:40 AM Michael Walle [ref]
> > wrote:
> >>
> >> The LS1028A SoC uses the same interrupt line for adjacent SAIs. Use
> >> IRQF_SHARED to be able to use these SAIs simultaneously.
> >
> > Hi Michael,
> >
> > Thanks for the patch. We have a similar change inside our internal tree
> > (it is on my long TODO list to upstream :D).
> >
> > We add the shared flag conditionally on a dts property.
> >
> > Do you think it is a good idea to always add shared flag? I'm thinking
> > on SAI IP integrations where the interrupt is edge triggered.
>
> Mhh, I don't really get the point to make the flag conditionally. If
> there is only one user, the flag won't hurt, correct?
>
> If there are two users, we need the flag anyway.
>
> > AFAIK edge triggered interrupts do not get along very well
> > with sharing an interrupt line.
>
> So in that case you shouldn't use shared edge triggered interrupts in
> the
> SoC in the first place, I guess.

I think you make a good point. I was thinking that it would hurt the single
user case. But it is fine.

Thanks for the patch.

Acked-by: Daniel Baluta <daniel.baluta@nxp.com>
```