857715f7ba
Add the bindings for the SMMU proxy driver. Change-Id: I8686cdeb5a3066834c8f6b154190cf4956809852 Signed-off-by: songrui <quic_songrui@quicinc.com>
55 lines
1.5 KiB
YAML
55 lines
1.5 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/arm/msm/smmu-proxy.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: SMMU Proxy Driver
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maintainers:
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- Chris Goldsworthy <cgoldswo@quicinc.com>
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description: |+
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The SMMU proxy driver allows DMA-BUFs on HLOS to be lent to the TVM and mapped
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into an S1 context bank of the client's choosing on the TVM. The IOVA of the
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mapped DMA-BUF is sent back to HLOS, which the client then passes to their
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hardware as they did before.
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The driver is split between HLOS and the TVM. Communication between the two
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sides is facilitated by a message queue, such that the TVM has a single
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message handling thread. The proxy driver directly manages the context banks
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of the client devices, as there is no client code to manage the mappings
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of the devices on the TVM.
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properties:
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compatible:
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items:
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- enum:
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- smmu-proxy-sender
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- smmu-proxy-receiver
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- smmu-proxy-cb
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iommus:
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maxItems: 1
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description: iommus tag in form of <&apps_smmu [SID] [MASK]>, such that
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[SID] will be for one of the relevant client context banks.
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required:
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- compatible
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additionalProperties: false
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examples:
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- |
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smmu-proxy {
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compatible = "smmu-proxy-sender";
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};
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- |
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smmu-proxy {
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compatible = "smmu-proxy-receiver";
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};
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smmu-proxy-camera-cb {
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compatible = "smmu-proxy-cb";
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iommus = <&apps_smmu 0x1000 0x0>;
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};
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