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

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Message-ID: <CAL_JsqKS1pB9GMjEwji_XO_DmrKs4J6GkcxpRkUqcAAHwCseQg@mail.gmail.com>
Date: Fri, 30 Aug 2024 09:44:41 -0500
From: Rob Herring <robh@...nel.org>
To: Nikunj Kela <quic_nkela@...cinc.com>
Cc: andersson@...nel.org, konradybcio@...nel.org, krzk+dt@...nel.org, 
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Subject: Re: [PATCH 21/22] ARM: dt: GIC: add extended SPI specifier

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