linux-kernel - [PATCH v2 1/2] dt-bindings: interrupt-controller: sifive,plic: Fix number of interrupts

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Date:   Thu, 16 Dec 2021 14:41:21 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Sagar Kadam <sagar.kadam@...ive.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH v2 1/2] dt-bindings: interrupt-controller: sifive,plic: Fix number of interrupts

The number of interrupts lacks an upper bound, thus assuming one,
causing properly grouped "interrupts-extended" properties to be flagged
as an error by "make dtbs_check".

Fix this by adding the missing "maxItems".  As the architectural maximum
is 15872 interrupts, using that as the limit would be unpractical.
Hence limit it to 9 interrupts (one interrupt for a system management
core, and two interrupts per core for other cores).  This should be
sufficient for now, and the limit can always be increased when the need
arises.

Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
v2:
  - Split in two patches,
  - Improve patch description and document limit rationale.
---
 .../bindings/interrupt-controller/sifive,plic-1.0.0.yaml         | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
index 28b6b17fe4b26778..0c6687511457413e 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
+++ b/Documentation/devicetree/bindings/interrupt-controller/sifive,plic-1.0.0.yaml
@@ -62,6 +62,7 @@ properties:
 
   interrupts-extended:
     minItems: 1
+    maxItems: 9
     description:
       Specifies which contexts are connected to the PLIC, with "-1" specifying
       that a context is not present. Each node pointed to should be a
-- 
2.25.1