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This adds the binding for describing shared memory used to exchange file system blocks between the RMTFS client and service. A client for this is generally found in the modem firmware and is used for accessing persistent storage for things such as radio calibration. Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Signed-off-by: Andy Gross <andy.gross@linaro.org>
52 lines
1.3 KiB
Plaintext
52 lines
1.3 KiB
Plaintext
Qualcomm Remote File System Memory binding
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This binding describes the Qualcomm remote filesystem memory, which serves the
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purpose of describing the shared memory region used for remote processors to
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access block device data using the Remote Filesystem protocol.
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- compatible:
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Usage: required
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Value type: <stringlist>
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Definition: must be:
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"qcom,rmtfs-mem"
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- reg:
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Usage: required for static allocation
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Value type: <prop-encoded-array>
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Definition: must specify base address and size of the memory region,
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as described in reserved-memory.txt
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- size:
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Usage: required for dynamic allocation
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Value type: <prop-encoded-array>
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Definition: must specify a size of the memory region, as described in
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reserved-memory.txt
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- qcom,client-id:
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Usage: required
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Value type: <u32>
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Definition: identifier of the client to use this region for buffers.
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- qcom,vmid:
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Usage: optional
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Value type: <u32>
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Definition: vmid of the remote processor, to set up memory protection.
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= EXAMPLE
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The following example shows the remote filesystem memory setup for APQ8016,
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with the rmtfs region for the Hexagon DSP (id #1) located at 0x86700000.
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reserved-memory {
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#address-cells = <2>;
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#size-cells = <2>;
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ranges;
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rmtfs@86700000 {
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compatible = "qcom,rmtfs-mem";
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reg = <0x0 0x86700000 0x0 0xe0000>;
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no-map;
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qcom,client-id = <1>;
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};
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};
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