linux-kernel - Re: [PATCH] wifi: brcmfmac: of: Support interrupts-extended

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Date: Sat, 22 Jun 2024 19:46:28 +0200
From: Arend Van Spriel <arend.vanspriel@...adcom.com>
To: Alex Bee <knaerzche@...il.com>, Kalle Valo <kvalo@...nel.org>, <linux-wireless@...r.kernel.org>, <brcm80211@...ts.linux.dev>, <brcm80211-dev-list.pdl@...adcom.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] wifi: brcmfmac: of: Support interrupts-extended

On June 22, 2024 4:07:40 PM Alex Bee <knaerzche@...il.com> wrote:

> Am 22.06.24 um 15:49 schrieb Arend Van Spriel:
>> On June 22, 2024 3:38:32 PM Arend Van Spriel
>> <arend.vanspriel@...adcom.com> wrote:
>>
>>> On June 22, 2024 12:56:02 AM Alex Bee <knaerzche@...il.com> wrote:
>>>
>>>> This "new" version of defining external interrupts is around for a very
>>>> long time now and supported and preferred by irq_of_parse_and_map
>>>> respectively of_irq_parse_one.
>>>>
>>>> Support it in brcmfmac as well by checking if either "interrupts" or
>>>> "interrupts-extended" property exists as indication if
>>>> irq_of_parse_and_map
>>>> should be called.
>>>
>>> All very interesting, but why should we add code for something that
>>> is not
>>> specified in the bindings documentation?
>>>
>>> NAK (for now). Feel free to update the bindings document.
> Sure, if you insist on it, I can update the bindings document. So far not
> many (no) users did that, as it is clearly specified as an alternative in
> devicetree/bindings/interrupt-controller/interrupts.txt (sure, it's not yet
> converted to yaml yet).

Right. So in my opinion that should be handled by the interrupt subsystem. 
Hence I dived into irq_of_parse_and_map(). I would suggest to open code that:

/* make sure there are interrupts defined in the node */
- if (!of_property_present(np, "interrupts"))
+ if (of_irq_parse_one(...))
  return;

irq = irq_create_of_mapping(...);

> Which is a much nicer form, imho.
> And by the way for instance
> arch/arm/boot/dts/qcom/qcom-apq8026-lg-lenok.dts already uses it that way
> and the interrupt will currently not picked up (at least not by this
> driver).

I expected the "nicer" argument would be thrown in at some point. Esthetics 
are never a technical argument, but let's not debate that ;-) Hopefully you 
can agree with my suggestion.

Regards,
Arend



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