Thanks Rob, for taking time to review these bindings.
On Mon, Jan 29 2018 at 19:08 +0000, Rob Herring wrote:
On Thu, Jan 18, 2018 at 03:28:02PM -0700, Lina Iyer wrote:
From: Mahesh Sivasubramanian <msivasub@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Mahesh Sivasubramanian <msivasub@xxxxxxxxxxxxxx>
Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/arm/msm/cmd-db.txt | 37 ++++++++++++++++++++++
1 file changed, 37 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..b56e3e3604d3
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/msm/cmd-db.txt
@@ -0,0 +1,37 @@
+Command DB
+---------
Another strange QCom binding...
:)
+
+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.
Is said shared memory described in DT. If so, this should be a child
node. Only 8 bytes seems kind of fine grained for putting in DT when it
could be implied by the parent shared memory node.
I dont believe this memory will be described in DT for this chipset.
Will ask internally.
+
+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 table may change, but does the presence of it or shared memory
location (of the pointer) change?
The location may change between different SoCs, but will be present in
all chipsets of this architecture.
Thanks,
Lina
+
+Command DB allows drivers to query resource parameters based on pre-determined
+key strings.
+
+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: First element is the base address of shared memory
+ Second element is the size of the shared memory region
+ Points to the dictionary address that houses the command DB
+ start address and the size of the command DB region
+
+Example:
+
+ qcom,cmd-db@c3f000c {
+ compatible = "qcom,cmd-db";
+ reg = <0xc3f000c 0x8>;
+ };
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