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dt-bindings: PCI: mediatek-gen3: Allow memory-region for restricted DMA buffer

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On some SoCs without an IOMMU behind the PCIe controller, the PCIe
controller memory access could be limited to a small region by the
firmware configuring a memory protection unit. This memory region
must be assigned to the PCIe controller so that the OS knows to
use that region. Otherwise PCIe devices would not work properly.

Allow the memory-region property with one item pointing to a
restricted DMA buffer.

Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260720092116.1823562-1-wenst@chromium.org
This commit is contained in:
Chen-Yu Tsai 2026-07-20 17:21:15 +08:00 committed by Manivannan Sadhasivam
parent 068601b547
commit 7e38b7b0e0
1 changed files with 4 additions and 0 deletions
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4
Documentation/devicetree/bindings/pci/mediatek-pcie-gen3.yaml
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@ -116,6 +116,10 @@ properties:
power-domains:
maxItems: 1
memory-region:
maxItems: 1
description: phandle to restricted DMA buffer
mediatek,pbus-csr:
$ref: /schemas/types.yaml#/definitions/phandle-array
items: