linux-kernel - [PATCH v7 2/2] dt-bindings: introduce Command DB for QCOM SoCs

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Message-Id: <20180406150805.6394-3-ilina@codeaurora.org>
Date:   Fri,  6 Apr 2018 09:08:05 -0600
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, sboyd@...nel.org,
        evgreen@...omium.org, dianders@...omium.org,
        Lina Iyer <ilina@...eaurora.org>, devicetree@...r.kernel.org,
        Mahesh Sivasubramanian <msivasub@...eaurora.org>
Subject: [PATCH v7 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>
Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
---

Changes in v7:
	- Fix description of 'reg' property

Changes in v6:
	- Move to bindings/reserved-memory
	- Remove indirection address and use only the actual reserved
	  memory

Changes in v4:
	- Fix unwanted capitalization
	- Add reg property
---
 .../bindings/reserved-memory/qcom,cmd-db.txt       | 36 ++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reserved-memory/qcom,cmd-db.txt

diff --git a/Documentation/devicetree/bindings/reserved-memory/qcom,cmd-db.txt b/Documentation/devicetree/bindings/reserved-memory/qcom,cmd-db.txt
new file mode 100644
index 000000000000..02e7d729bd77
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/qcom,cmd-db.txt
@@ -0,0 +1,36 @@
+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
+		    actual Command DB in memory.
+
+Example:
+
+	reserved-memory {
+		[...]
+		qcom,cmd-db@...e0000 {
+			reg = <0x0 0x85fe0000 0x0 0x20000>;
+			compatible = "qcom,cmd-db";
+		};
+	};
-- 
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