linux-kernel - [PATCH v4 2/2] dt-bindings: introduce Command DB for QCOM SoCs

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Message-Id: <20180226175802.20052-3-ilina@codeaurora.org>
Date:   Mon, 26 Feb 2018 10:58:02 -0700
From:   Lina Iyer <ilina@...eaurora.org>
To:     andy.gross@...aro.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Cc:     rnayak@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, Lina Iyer <ilina@...eaurora.org>,
        devicetree@...r.kernel.org,
        Mahesh Sivasubramanian <msivasub@...eaurora.org>
Subject: [PATCH v4 2/2] dt-bindings: introduce Command DB for QCOM SoCs

From: Mahesh Sivasubramanian <msivasub@...eaurora.org>

Command DB provides information on shared resources like clocks,
regulators etc., probed at boot by the remote subsytem and made
available in shared memory.

Cc: devicetree@...r.kernel.org
Signed-off-by: Mahesh Sivasubramanian <msivasub@...eaurora.org>
Signed-off-by: Lina Iyer <ilina@...eaurora.org>
---

Changes in v4:
	- Fix unwanted capitalization
	- Add reg property
---
 .../devicetree/bindings/arm/msm/cmd-db.txt         | 38 ++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/arm/msm/cmd-db.txt

diff --git a/Documentation/devicetree/bindings/arm/msm/cmd-db.txt b/Documentation/devicetree/bindings/arm/msm/cmd-db.txt
new file mode 100644
index 000000000000..5737ed2ac6e8
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/msm/cmd-db.txt
@@ -0,0 +1,38 @@
+Command DB
+---------
+
+Command DB is a database that provides a mapping between resource key and the
+resource address for a system resource managed by a remote processor. The data
+is stored in a shared memory region and is loaded by the remote processor.
+
+Some of the Qualcomm Technologies Inc SoC's have hardware accelerators for
+controlling shared resources. Depending on the board configuration the shared
+resource properties may change. These properties are dynamically probed by the
+remote processor and made available in the shared memory.
+
+The bindings for Command DB is specified in the reserved-memory section in
+devicetree. The devicetree representation of the command DB driver should be:
+
+Properties:
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: Should be "qcom,cmd-db"
+
+- reg:
+	Usage: required
+	Value type: <prop encoded array>
+	Definition: The register address that points to the location of the
+		    Command DB in memory. Additionally, specify the address
+		    and size of the actual lacation in memory.
+
+Example:
+
+	reserved-memory {
+		[...]
+		qcom,cmd-db@...000c {
+			reg = <0x0 0xc3f000c 0x0 0x8>,
+			      <0x0 0x85fe0000 0x0 0x20000>;
+			compatible = "qcom,cmd-db";
+		};
+	};
-- 
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