linux-kernel - [PATCH] dt-bindings: virtio,mmio: Allow setting devices 'dma-coherent'

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Date:   Wed,  9 Mar 2022 19:35:27 -0600
From:   Rob Herring <robh@...nel.org>
To:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>
Cc:     virtualization@...ts.linux-foundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] dt-bindings: virtio,mmio: Allow setting devices 'dma-coherent'

'virtio,mmio' devices are always coherent within a guest. As Arm DTs
are default non-coherent, the 'dma-coherent' property needs to be set on
the virtio device to mark them as such. This aligns with the QEMU 'virt'
machine DTB.

Signed-off-by: Rob Herring <robh@...nel.org>
---
 Documentation/devicetree/bindings/virtio/mmio.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/virtio/mmio.yaml b/Documentation/devicetree/bindings/virtio/mmio.yaml
index 4b7a0273181c..10c22b5bd16a 100644
--- a/Documentation/devicetree/bindings/virtio/mmio.yaml
+++ b/Documentation/devicetree/bindings/virtio/mmio.yaml
@@ -20,6 +20,8 @@ properties:
   reg:
     maxItems: 1
 
+  dma-coherent: true
+
   interrupts:
     maxItems: 1
 
-- 
2.32.0