[PATCH v5 2/2] dt-bindings: introduce Command DB for QCOM SoCs

Lina Iyer
2018-03-14T17:14:20Z

From: Mahesh Sivasubramanian <msivasub@codeaurora.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@vger.kernel.org
Signed-off-by: Mahesh Sivasubramanian <msivasub@codeaurora.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

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

diff --git a/Documentation/devicetree/bindings/soc/qcom/cmd-db.txt b/Documentation/devicetree/bindings/soc/qcom/cmd-db.txt
new file mode 100644
index 000000000000..5737ed2ac6e8
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/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@c3f000c {
+ reg = <0x0 0xc3f000c 0x0 0x8>,
+ <0x0 0x85fe0000 0x0 0x20000>;
+ compatible = "qcom,cmd-db";
+ };
+ };