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@xxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
Changes since v3:
- None
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>;
+ };
+ };
--
2.12.0
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