linux-kernel - [RFC 1/7] soc: qcom: Add device tree binding for SMEM

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Date:	Mon, 29 Sep 2014 17:34:45 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Kumar Gala <galak@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...aro.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>
CC:	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Suman Anna <s-anna@...com>
Subject: [RFC 1/7] 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>
---

Exposed by this node is a set of items of different sizes. For many things a
standard of_xlate method of referencing the individual nodes would be
preferable, so a #something-cells would make sense. We do however also needs
access to these items without explicitly stating the references in devicetree
(e.g. SMD references 257 of these). I haven't found any good example of how to
implement this, so suggestions are welcome.

Note that the hwspinlock reference is not yet supported in the mainline, but
this will likely need a few iterations so I wanted to get this out.

 .../devicetree/bindings/soc/qcom/qcom,smem.txt     |   34 ++++++++++++++++++++
 1 file changed, 34 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..ddd58c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smem.txt
@@ -0,0 +1,34 @@
+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"
+
+- reg:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: base address and size pair for each area representing the
+		    shared memory. The first pair will must represent the "main"
+		    area, where the shared memory header and table-of-content
+		    can be found.
+
+- hwspinlocks:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: reference to a hwspinlock used to protect allocations from
+		    the shared memory
+
+= EXAMPLE
+
+        smem: smem@...0000 {
+                compatible = "qcom,smem";
+                reg = <0x0fa00000 0x200000>,
+                      <0xfc428000 0x4000>;
+
+                hwspinlocks = <&tcsr_mutex 3>;
+        };
-- 
1.7.9.5

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