linux-kernel - Re: [PATCH 1/2] dt-bindings: interrupt-controller: apple,aic2: Add AICv3

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Message-Id: <87y0ll6i23.fsf@bloch.sibelius.xs4all.nl>
Date: Sun, 25 Jan 2026 12:35:48 +0100
From: Mark Kettenis <mark.kettenis@...all.nl>
To: Janne Grunau <j@...nau.net>
Cc: sven@...nel.org, neal@...pa.dev, tglx@...utronix.de,
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	j@...nau.net
Subject: Re: [PATCH 1/2] dt-bindings: interrupt-controller: apple,aic2: Add
 AICv3

> From: Janne Grunau <j@...nau.net>
> Date: Sun, 25 Jan 2026 12:08:45 +0100

Hi Janne,

> 
> AIC version 3 as found on the Apple M3 (t8122) is very similar to AICv2
> in its base functionality. It can use the same device tree bindings as
> AICv2 so add it to the AICv2 bindings.
> This interrupt controller is used on all Apple SoCs starting with M3 up
> to at least M5.
> The only apparent difference is the increased IRQ config offset. Apple's
> device tree codes this new offset as property of the "aic" node but the
> value stayed constant for all SoCs with "aic,3". Since the SoC specific
> compatible "apple,t8122-aic3" will be used in the driver this offset can
> remain a driver implementation detail.
> 
> Signed-off-by: Janne Grunau <j@...nau.net>
> ---
>  .../bindings/interrupt-controller/apple,aic2.yaml  | 29 +++++++++++++++-------
>  1 file changed, 20 insertions(+), 9 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/apple,aic2.yaml b/Documentation/devicetree/bindings/interrupt-controller/apple,aic2.yaml
> index ee5a0dfff437816056bda0de5523bf38be4f49ba..933e134d82bb599a68707ba34e04ea55d61050b9 100644
> --- a/Documentation/devicetree/bindings/interrupt-controller/apple,aic2.yaml
> +++ b/Documentation/devicetree/bindings/interrupt-controller/apple,aic2.yaml
> @@ -4,10 +4,10 @@
>  $id: http://devicetree.org/schemas/interrupt-controller/apple,aic2.yaml#
>  $schema: http://devicetree.org/meta-schemas/core.yaml#
>  
> -title: Apple Interrupt Controller 2
> +title: Apple Interrupt Controller 2 and 3
>  
>  maintainers:
> -  - Hector Martin <marcan@...can.st>
> +  - Janne Grunau <j@...nau.net>
>  
>  description: |
>    The Apple Interrupt Controller 2 is a simple interrupt controller present on
> @@ -28,14 +28,23 @@ description: |
>    which do not go through a discrete interrupt controller. It also handles
>    FIQ-based Fast IPIs.
>  
> +  The Apple Interrupt Controller 3 is in its base functionality very similar to
> +  the Apple Interrupt Controller 2 and uses the same device tree bindings. It is
> +  found on Apple ARM SoCs platforms starting with t8122 (M3).
> +
>  properties:
>    compatible:
> -    items:
> -      - enum:
> -          - apple,t8112-aic
> -          - apple,t6000-aic
> -          - apple,t6020-aic
> -      - const: apple,aic2
> +    oneOf:
> +      - items:
> +          - enum:
> +              - apple,t8112-aic
> +              - apple,t6000-aic
> +              - apple,t6020-aic
> +          - const: apple,aic2
> +      - items:
> +          - enum:
> +              - apple,t6030-aic3
> +          - const: apple,t8122-aic3

I think this is missing a

         - const: apple,t8122-aic3

otherwise, the non-{Pro/Ultra/Max} M3 can't have the simple

    compatible = "apple,t8122-aic3"

>  
>    interrupt-controller: true
>  
> @@ -117,7 +126,9 @@ allOf:
>        properties:
>          compatible:
>            contains:
> -            const: apple,t8112-aic
> +            enum:
> +              - apple,t8112-aic
> +              - apple,t8122-aic3
>      then:
>        properties:
>          '#interrupt-cells':
> 
> -- 
> 2.52.0
> 
> 
>