This adds the binding for describing shared memory buffers for
implementing the remote filesystem protocol.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
My initial attempt was to mimic the ramoops of just adding the compatible to
the reserved-memory node, but I have not been able to figure out a sane way of
getting hold of the base address in the case that the memory region is
described my a "size" only (done on some platforms).
The problem is that we create the reserved_mem objects (and remove the
memblocks) while we're still operating on the flattened representation, so
without a phandle it doesn't seem like we have anything to perform the
comparison with later on.
.../devicetree/bindings/soc/qcom/qcom,rfsa.txt | 43 ++++++++++++++++++++++
1 file changed, 43 insertions(+)
create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,rfsa.txt
diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,rfsa.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,rfsa.txt
new file mode 100644
index 000000000000..b4de0de74e46
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,rfsa.txt
@@ -0,0 +1,43 @@
+Qualcomm Remote File System Access binding
+
+This binding describes the Qualcomm RFSA, which serves the purpose of managing
+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,rfsa"
+
+- memory-region:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: handle to memory reservation the associated rfsa region.
+
+- qcom,client-id:
+ Usage: required
+ Value type: <u32>
+ Definition: identifier of the client to use this region for buffers.
+
+= EXAMPLE
+The following example shows the RFSA setup for APQ8016, with the RFSA region
+for the Hexagon DSP (id #1) located at 0x86700000.
+
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ rmtfs: rmtfs@86700000 {
+ reg = <0x0 0x86700000 0x0 0xe0000>;
+ no-map;
+ };
+ };
+
+ hexagon-rfsa {
+ compatible = "qcom,rfsa";
+ memory-region = <&rmtfs>;
+
+ qcom,client-id = <1>;
+ };
--
2.12.0
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