On Sat, Apr 22, 2017 at 10:35:17AM -0700, Bjorn Andersson wrote:
> 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).
I prefer the ramoops way.
> 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.
I'm not sure I follow.
>
> .../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"
No versioning?
> +
> +- 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.
What determines these numbers?
> +
> += 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 {
I think you should have a compatible here even with the 2 node approach.
> + 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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