openwrt/target/linux/ipq806x/patches-3.18/034-soc-qcom-Add-device-tree-binding-for-SMEM.patch

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Subject: [v2,1/2] soc: qcom: Add device tree binding for SMEM
From: Bjorn Andersson <[email protected]>
X-Patchwork-Id: 6202201
Message-Id: <[email protected]>
To: Rob Herring <[email protected]>, Pawel Moll <[email protected]>,
	Mark Rutland <[email protected]>,
	Ian Campbell <[email protected]>,
	Kumar Gala <[email protected]>, Jeffrey Hugo <[email protected]>, 
	Andry Gross <[email protected]>
Cc: <[email protected]>,
	linux-arm-msm <[email protected]>,
	<[email protected]>
Date: Sat, 11 Apr 2015 16:32:57 -0700

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

Signed-off-by: Bjorn Andersson <[email protected]>

---
Changes since v1:
- None

 .../devicetree/bindings/soc/qcom/qcom,smem.txt     | 49 ++++++++++++++++++++++
 1 file changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt

--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
@@ -0,0 +1,49 @@
+Qualcomm Shared Memory binding
+
+This binding describes the Qualcomm Shared Memory, 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.
+
+- reg:
+	Usage: optional
+	Value type: <prop-encoded-array>
+	Definition: base address and size pair for any additional memory areas
+		    of the shared memory.
+
+- hwspinlocks:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: reference to a hwspinlock used to protect allocations from
+		    the shared memory
+
+= EXAMPLE
+
+	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>;
+		reg = <0xfc428000 0x4000>;
+
+		hwlocks = <&tcsr_mutex 3>;
+	};