linux-kernel - [PATCH v6 1/2] DT: hwspinlock: Add binding documentation for Qualcomm hwmutex

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Date:	Fri, 27 Feb 2015 14:30:16 -0800
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>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Kumar Gala <galak@...eaurora.org>
CC:	Suman Anna <s-anna@...com>, <linux-arm-msm@...r.kernel.org>,
	Jeffrey Hugo <jhugo@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v6 1/2] DT: hwspinlock: Add binding documentation for Qualcomm hwmutex

Add binding documentation for the Qualcomm Hardware Mutex.

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

I think the conclusion on the dt binding discussion for hwspinlocks was that
we're down to having the #hwlock-cells intact. So this version includes that,
but non of the other previously discussed properties.

Changes since v5:
- Extracted the dt binding documentation into a separate patch
- Moved the driver to consume a syscon
- Dropped previously suggested generic hwlock dt bindings

 .../devicetree/bindings/hwlock/qcom-hwspinlock.txt | 39 ++++++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt

diff --git a/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
new file mode 100644
index 0000000..28ade7d
--- /dev/null
+++ b/Documentation/devicetree/bindings/hwlock/qcom-hwspinlock.txt
@@ -0,0 +1,39 @@
+Qualcomm Hardware Mutex Block:
+
+The hardware block provides mutexes utilized between different processors on
+the SoC as part of the communication protocol used by these processors.
+
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: must be one of:
+		    "qcom,sfpb-mutex",
+		    "qcom,tcsr-mutex"
+
+- syscon:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: one cell containing:
+		    syscon phandle
+		    offset of the hwmutex block within the syscon
+		    stride of the hwmutex registers
+
+- #hwlock-cells:
+	Usage: required
+	Value type: <u32>
+	Definition: must be 1, the specified cell represent the lock id
+		    (hwlock standard property, see hwlock.txt)
+
+Example:
+
+        tcsr: syscon@...00000 {
+		compatible = "qcom,tcsr-msm8974", "syscon";
+		reg = <0xfd484000 0x2000>;
+	};
+
+	hwlock@...84000 {
+		compatible = "qcom,tcsr-mutex";
+		syscon = <&tcsr 0 0x80>;
+
+		#hwlock-cells = <1>;
+	};
-- 
1.8.2.2

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