linux-kernel - [PATCH v2 1/2] soc: qcom: Add device tree binding for SMEM

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Date:	Sat, 11 Apr 2015 16:32:57 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jeffrey Hugo <jhugo@...eaurora.org>,
	Andry Gross <agross@...eaurora.org>
CC:	<devicetree@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH v2 1/2] soc: qcom: Add device tree binding for SMEM

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

Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
---

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

diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
new file mode 100644
index 0000000..d90f839
--- /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@...0000 {
+			reg = <0xfa00000 0x200000>;
+			no-map;
+		};
+	};
+
+	smem@...0000 {
+		compatible = "qcom,smem";
+
+		memory-region = <&smem_region>;
+		reg = <0xfc428000 0x4000>;
+
+		hwlocks = <&tcsr_mutex 3>;
+	};
-- 
1.8.2.2

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