From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bjorn Andersson Subject: [PATCH v2 3/5] dt-binding: soc: qcom: Add binding for RFSA Date: Wed, 2 Aug 2017 19:57:52 -0700 Message-ID: <20170803025754.19101-4-bjorn.andersson@linaro.org> References: <20170803025754.19101-1-bjorn.andersson@linaro.org> Return-path: In-Reply-To: <20170803025754.19101-1-bjorn.andersson@linaro.org> Sender: linux-kernel-owner@vger.kernel.org To: Rob Herring , Frank Rowand , Andy Gross , David Brown , Mark Rutland Cc: linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org List-Id: devicetree@vger.kernel.org This adds the binding for describing shared memory used to exchange file system blocks between the RMTFS client and service. Signed-off-by: Bjorn Andersson --- 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,rfsa.txt | 51 ++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 Documentation/devicetree/bindings/reserved-memory/qcom,rfsa.txt diff --git a/Documentation/devicetree/bindings/reserved-memory/qcom,rfsa.txt b/Documentation/devicetree/bindings/reserved-memory/qcom,rfsa.txt new file mode 100644 index 000000000000..d9bec8eec696 --- /dev/null +++ b/Documentation/devicetree/bindings/reserved-memory/qcom,rfsa.txt @@ -0,0 +1,51 @@ +Qualcomm Remote File System Access binding + +This binding describes the Qualcomm RFSA, 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: + Definition: must be: + "qcom,rfsa" + +- reg: + Usage: required for static allocation + Value type: + 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: + Definition: must specify a size of the memory region, as described in + reserved-memory.txt + +- qcom,client-id: + Usage: required + Value type: + Definition: identifier of the client to use this region for buffers. + +- qcom,vmid: + Usage: optional + Value type: + Definition: vmid of the remote processor, to set up memory protection. + += 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@86700000 { + compatible = "qcom,rfsa"; + reg = <0x0 0x86700000 0x0 0xe0000>; + no-map; + + qcom,client-id = <1>; + }; + }; -- 2.12.0