linux-kernel - [PATCH hyperv-next v4 4/6] dt-bindings: microsoft,vmbus: Add GIC and DMA coherence to the example

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Message-ID: <20250212014321.1108840-5-romank@linux.microsoft.com>
Date: Tue, 11 Feb 2025 17:43:19 -0800
From: Roman Kisel <romank@...ux.microsoft.com>
To: arnd@...db.de,
	bhelgaas@...gle.com,
	bp@...en8.de,
	catalin.marinas@....com,
	conor+dt@...nel.org,
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Cc: benhill@...rosoft.com,
	bperkins@...rosoft.com,
	sunilmut@...rosoft.com
Subject: [PATCH hyperv-next v4 4/6] dt-bindings: microsoft,vmbus: Add GIC and DMA coherence to the example

The existing example lacks the GIC interrupt controller property
making it not possible to boot on ARM64, and it lacks the DMA
coherence property making the kernel do more work on maintaining
CPU caches on ARM64 although the VMBus trancations are cache-coherent.

Add the GIC node, specify DMA coherence, and define interrupt-parent
and interrupts properties in the example to provide a complete reference
for platforms utilizing GIC-based interrupts, and add the DMA coherence
property to not do extra work on the architectures where DMA defaults to
non cache-coherent.

Signed-off-by: Roman Kisel <romank@...ux.microsoft.com>
---
 .../devicetree/bindings/bus/microsoft,vmbus.yaml      | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/bus/microsoft,vmbus.yaml b/Documentation/devicetree/bindings/bus/microsoft,vmbus.yaml
index a8d40c766dcd..5ec69226ab85 100644
--- a/Documentation/devicetree/bindings/bus/microsoft,vmbus.yaml
+++ b/Documentation/devicetree/bindings/bus/microsoft,vmbus.yaml
@@ -44,11 +44,22 @@ examples:
             #size-cells = <1>;
             ranges;
 
+            gic: intc@...00000 {
+              compatible = "arm,gic-v3";
+              reg = <0x0 0xfe200000 0x0 0x10000>,   /* GIC Dist */
+                    <0x0 0xfe280000 0x0 0x200000>;  /* GICR */
+              interrupt-controller;
+              #interrupt-cells = <3>;
+            }
+
             vmbus@...000000 {
                 compatible = "microsoft,vmbus";
                 #address-cells = <2>;
                 #size-cells = <1>;
                 ranges = <0x0f 0xf0000000 0x0f 0xf0000000 0x10000000>;
+                dma-coherent;
+                interrupt-parent = <&gic>;
+                interrupts = <1 2 1>;
             };
         };
     };
-- 
2.43.0