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Subject[PATCH v8 2/2] dt-bindings: introduce Command DB for QCOM SoCs
From: Mahesh Sivasubramanian <>

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

Signed-off-by: Mahesh Sivasubramanian <>
Signed-off-by: Lina Iyer <>
Reviewed-by: Bjorn Andersson <>
Reviewed-by: Rob Herring <>
Reviewed-by: Stephen Boyd <>
Reviewed-by: Evan Green <>

Changes in v8:
- Fix node name
- Add no-map property
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

Changes in v4:
- Fix unwanted capitalization
- Add reg property
.../bindings/reserved-memory/qcom,cmd-db.txt | 37 ++++++++++++++++++++++
1 file changed, 37 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..68395530c0a5
--- /dev/null
+++ b/Documentation/devicetree/bindings/reserved-memory/qcom,cmd-db.txt
@@ -0,0 +1,37 @@
+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:
+- 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 actual location of
+ the Command DB in memory.
+ reserved-memory {
+ [...]
+ reserved-memory@85fe0000 {
+ reg = <0x0 0x85fe0000 0x0 0x20000>;
+ compatible = "qcom,cmd-db";
+ no-map;
+ };
+ };
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a Linux Foundation Collaborative Project
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