linux-kernel - Re: [PATCH] ASoC: fsl_sai: add IRQF

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Date:   Thu, 05 Dec 2019 10:18:10 +0100
From:   Michael Walle <michael@...le.cc>
To:     Daniel Baluta <daniel.baluta@...il.com>
Cc:     Linux-ALSA <alsa-devel@...a-project.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Timur Tabi <timur@...nel.org>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH] ASoC: fsl_sai: add IRQF_SHARED

Hi Daniel,

Am 2019-12-05 09:43, schrieb Daniel Baluta:
> On Fri, Nov 29, 2019 at 12:40 AM Michael Walle <michael@...le.cc> 
> 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.

-michael