[PATCH v3 3/5] dt-binding: soc: qcom: Add binding for rmtfs memory
From: Bjorn Andersson <hidden>
Date: 2017-10-05 03:33:13
Also in:
linux-arm-kernel, linux-arm-msm, lkml
Subsystem:
arm/qualcomm mailing list, arm/qualcomm support, open firmware and flattened device tree bindings, the rest · Maintainers:
Bjorn Andersson, Konrad Dybcio, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <redacted> --- Changes since v2: - Renamed compatible to "rmtfs-mem" in attempt to clarify that this is not a file system, but some chunk of memory. Changed since v1: - Memory described in a single reserved-memory node, rather than by reference from a "dummy" node - qcom,vmdid added .../bindings/reserved-memory/qcom,rmtfs-mem.txt | 51 ++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/devicetree/bindings/reserved-memory/qcom,rmtfs-mem.txt
diff --git a/Documentation/devicetree/bindings/reserved-memory/qcom,rmtfs-mem.txt b/Documentation/devicetree/bindings/reserved-memory/qcom,rmtfs-mem.txt
new file mode 100644
index 000000000000..8562ba1dce69
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/qcom,rmtfs-mem.txt@@ -0,0 +1,51 @@ +Qualcomm Remote File System Memory binding + +This binding describes the Qualcomm remote filesystem memory, which serves the +purpose of describing the shared memory region used for remote processors to +access block device data using the Remote Filesystem protocol. + +- compatible: + Usage: required + Value type: <stringlist> + Definition: must be: + "qcom,rmtfs-mem" + +- reg: + Usage: required for static allocation + Value type: <prop-encoded-array> + Definition: must specify base address and size of the memory region, + as described in reserved-memory.txt + +- size: + Usage: required for dynamic allocation + Value type: <prop-encoded-array> + Definition: must specify a size of the memory region, as described in + reserved-memory.txt + +- qcom,client-id: + Usage: required + Value type: <u32> + Definition: identifier of the client to use this region for buffers. + +- qcom,vmid: + Usage: optional + Value type: <u32> + Definition: vmid of the remote processor, to set up memory protection. + += EXAMPLE +The following example shows the remote filesystem memory setup for APQ8016, +with the rmtfs region for the Hexagon DSP (id #1) located at 0x86700000. + + reserved-memory { + #address-cells = <2>; + #size-cells = <2>; + ranges; + + rmtfs@86700000 { + compatible = "qcom,rmtfs-mem"; + reg = <0x0 0x86700000 0x0 0xe0000>; + no-map; + + qcom,client-id = <1>; + }; + };
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2.12.0