linux-kernel - [PATCH v2 2/2] dt-bindings: introduce Command DB for QCOM SoCs

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Message-Id: <20180208195154.3580-3-ilina@codeaurora.org>
Date:   Thu,  8 Feb 2018 12:51:54 -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:     sboyd@...eaurora.org, rnayak@...eaurora.org,
        msivasub@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, Lina Iyer <ilina@...eaurora.org>,
        devicetree@...r.kernel.org
Subject: [PATCH v2 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>
---
 .../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..e21666e40ebf
--- /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 devicetree representation of the command DB driver should be:
+
+PROPERTIES:
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: Should be "qcom,cmd-db"
+
+- memory-region:
+	Usage: required
+	Value type: <phandle>
+	Definition: The phandle to the reserved memory region.
+
+Example:
+
+	reserved-memory {
+		[...]
+		cmd_db_mem: qcom,cmd-db@...000c {
+			reg = <0x0 0xc3f000c 0x0 0x8>;
+		};
+	};
+
+	qcom,cmd-db@...000c {
+		compatible = "qcom,cmd-db";
+		memory-region = <&cmd_db_mem>;
+	};
-- 
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