Commit 93aaf76a authored by Bjorn Andersson's avatar Bjorn Andersson Committed by Andy Gross
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soc: qcom: Add device tree binding for SMEM 



Add device tree binding documentation for the Qualcom Shared Memory
Manager.

Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: default avatarAndy Gross <agross@codeaurora.org>
parent 6ff33f39

Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt

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Qualcomm Shared Memory Manager binding



This binding describes the Qualcomm Shared Memory Manager, used to share data

between various subsystems and OSes in Qualcomm platforms.



- compatible:

	Usage: required

	Value type: <stringlist>

	Definition: must be:

		    "qcom,smem"



- memory-region:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: handle to memory reservation for main SMEM memory region.



- qcom,rpm-msg-ram:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: handle to RPM message memory resource



- hwlocks:

	Usage: required

	Value type: <prop-encoded-array>

	Definition: reference to a hwspinlock used to protect allocations from

		    the shared memory



= EXAMPLE

The following example shows the SMEM setup for MSM8974, with a main SMEM region

at 0xfa00000 and the RPM message ram at 0xfc428000:



	reserved-memory {

		#address-cells = <1>;

		#size-cells = <1>;

		ranges;



		smem_region: smem@fa00000 {

			reg = <0xfa00000 0x200000>;

			no-map;

		};

	};



	smem@fa00000 {

		compatible = "qcom,smem";



		memory-region = <&smem_region>;

		qcom,rpm-msg-ram = <&rpm_msg_ram>;



		hwlocks = <&tcsr_mutex 3>;

	};



	soc {

		rpm_msg_ram: memory@fc428000 {

			compatible = "qcom,rpm-msg-ram";

			reg = <0xfc428000 0x4000>;

		};

	};