linux-kernel - Re: [PATCH 21/22] ARM: dt: GIC: add extended SPI specifier

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Message-ID: <fdca4af1-a625-4eb8-a5e9-60ffd285af33@quicinc.com>
Date: Fri, 30 Aug 2024 07:51:05 -0700
From: Nikunj Kela <quic_nkela@...cinc.com>
To: Rob Herring <robh@...nel.org>
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Subject: Re: [PATCH 21/22] ARM: dt: GIC: add extended SPI specifier


On 8/30/2024 7:44 AM, Rob Herring wrote:
> On Thu, Aug 29, 2024 at 2:02 PM Nikunj Kela <quic_nkela@...cinc.com> wrote:
>>
>> On 8/29/2024 11:52 AM, Rob Herring wrote:
>>> On Wed, Aug 28, 2024 at 01:37:20PM -0700, Nikunj Kela wrote:
>>>> Add interrupt specifier for extended SPI interrupts.
>>> What's an "extended SPI"? Is this a GIC spec thing? If so, what version?
>> Extended SPI is an extended range of SPI interrupts supported by GIC.
>>
>> Excerpt below from
>> Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml
>>
>> "The 1st cell is the interrupt type; 0 for SPI interrupts, 1 for PPI
>> interrupts, 2 for interrupts in the Extended SPI range, 3 for the
>> Extended PPI range. Other values are reserved for future use."
>>
>> "The 2nd cell contains the interrupt number for the interrupt type. SPI
>> interrupts are in the range [0-987]. PPI interrupts are in the range
>> [0-15]. Extented SPI interrupts are in the range [0-1023]. Extended PPI
>> interrupts are in the range [0-127]."
> Looks like you should add EPPI define too while you're here.
>
> Rob

Sure Rob. I can add that. Generally, there is an ask for a usecase
before we push anything that is used in DT. I won't have any usecase to
show for EPPI.