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.
> +
> +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?
> +
> +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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