linux-kernel - [PATCH v3 1/4] dt-bindings: apple,aic: Document A7-A11 compatibles

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Message-ID: <20240901034143.12731-2-towinchenmi@gmail.com>
Date: Sun,  1 Sep 2024 11:40:04 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: ~postmarketos/upstreaming@...ts.sr.ht,
	konrad.dybcio@...ainline.org,
	Nick Chan <towinchenmi@...il.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v3 1/4] dt-bindings: apple,aic: Document A7-A11 compatibles

Document and describe the compatibles for Apple A7-A11 SoCs.

There are three feature levels:
- apple,aic: No fast IPI, for A7-A10
- apple,t8015-aic: fast IPI, global only, for A11
- apple,t8103-aic: fast IPI with local and global support, for M1

Each feature level is an extension of the previous, for example, M1 will
also work with the A7 feature level.

All of A7-M1 gets its own SoC-specific compatible, and the "apple,aic"
compatible as a fallback.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Reviewed-by: Sven Peter <sven@...npeter.dev>
Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 .../bindings/interrupt-controller/apple,aic.yaml   | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml b/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
index 698588e9aa86..4be9b596a790 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
+++ b/Documentation/devicetree/bindings/interrupt-controller/apple,aic.yaml
@@ -31,13 +31,25 @@ description: |
   This device also represents the FIQ interrupt sources on platforms using AIC,
   which do not go through a discrete interrupt controller.
 
+  IPIs may be performed via MMIO registers on all variants of AIC. Starting
+  from A11, system registers may also be used for "fast" IPIs. Starting from
+  M1, even faster IPIs within the same cluster may be achieved by writing to
+  a "local" fast IPI register as opposed to using the "global" fast IPI
+  register.
+
 allOf:
   - $ref: /schemas/interrupt-controller.yaml#
 
 properties:
   compatible:
     items:
-      - const: apple,t8103-aic
+      - enum:
+          - apple,s5l8960x-aic
+          - apple,t7000-aic
+          - apple,s8000-aic
+          - apple,t8010-aic
+          - apple,t8015-aic
+          - apple,t8103-aic
       - const: apple,aic
 
   interrupt-controller: true
-- 
2.46.0