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From: <daire.mcnamara@microchip.com>
To: <linux-pci@vger.kernel.org>, <devicetree@vger.kernel.org>
CC: <conor.dooley@microchip.com>, <lpieralisi@kernel.org>, <kw@linux.com>,
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Subject: [PATCH v3 3/3] dt-bindings: PCI: microchip,pcie-host: allow dma-noncoherent
Date: Wed, 12 Jun 2024 12:22:13 +0100
Message-ID: <20240612112213.2734748-4-daire.mcnamara@microchip.com>
In-Reply-To: <20240612112213.2734748-1-daire.mcnamara@microchip.com>
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From: Conor Dooley <conor.dooley@microchip.com>

PolarFire SoC may be configured in a way that requires non-coherent DMA
handling. On RISC-V, buses are coherent by default & the dma-noncoherent
property is required to denote buses or devices that are non-coherent.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
---
 Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
index f7a3c2636355..c84e1ae20532 100644
--- a/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
+++ b/Documentation/devicetree/bindings/pci/microchip,pcie-host.yaml
@@ -52,6 +52,8 @@ properties:
     items:
       pattern: '^fic[0-3]$'
 
+  dma-noncoherent: true
+
   interrupts:
     minItems: 1
     items:
-- 
2.34.1