The RPM MSG RAM contains per-RPM-master (e.g. APPS, ADSP etc.) sleep
statistics. They let one assess which core is actively preventing the
system from entering a true low-power mode.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 .../bindings/soc/qcom/qcom,rpm-master-stats.yaml   | 53 ++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,rpm-master-stats.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,rpm-master-stats.yaml
new file mode 100644
index 000000000000..d7e58cbd3344
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,rpm-master-stats.yaml
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/soc/qcom/qcom,rpm-master-stats.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies, Inc. (QTI) RPM Master Stats
+
+maintainers:
+  - Konrad Dybcio <konrad.dybcio@linaro.org>
+
+description:
+  Per-RPM-Master (e.g. APSS, ADSP, etc.) sleep statistics.
+
+properties:
+  compatible:
+    const: qcom,rpm-master-stats
+
+  qcom,rpm-msg-ram:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description: Phandle to an RPM MSG RAM slice containing the master stats
+    minItems: 1
+    maxItems: 5
+
+  qcom,master-names:
+    $ref: /schemas/types.yaml#/definitions/string-array
+    description: RPM Master name
+    minItems: 1
+    maxItems: 5
+
+required:
+  - compatible
+  - qcom,rpm-msg-ram
+  - qcom,master-names
+
+additionalProperties: false
+
+examples:
+  - |
+    stats {
+      compatible = "qcom,rpm-master-stats";
+      qcom,rpm-msg-ram = <&apss_master_stats>,
+                         <&mpss_master_stats>,
+                         <&adsp_master_stats>,
+                         <&cdsp_master_stats>,
+                         <&tz_master_stats>;
+      qcom,master-names = "APSS",
+                          "MPSS",
+                          "ADSP",
+                          "CDSP",
+                          "TZ";
+    };
+...

-- 
2.40.0

On 14/04/2023 13:37, Konrad Dybcio wrote:
> The RPM MSG RAM contains per-RPM-master (e.g. APPS, ADSP etc.) sleep
> statistics. They let one assess which core is actively preventing the
> system from entering a true low-power mode.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> ---
>  .../bindings/soc/qcom/qcom,rpm-master-stats.yaml   | 53 ++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,rpm-master-stats.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,rpm-master-stats.yaml
> new file mode 100644
> index 000000000000..d7e58cbd3344
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,rpm-master-stats.yaml
> @@ -0,0 +1,53 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/soc/qcom/qcom,rpm-master-stats.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Technologies, Inc. (QTI) RPM Master Stats
> +
> +maintainers:
> +  - Konrad Dybcio <konrad.dybcio@linaro.org>
> +
> +description:
> +  Per-RPM-Master (e.g. APSS, ADSP, etc.) sleep statistics.

Explain what is RPM-Master and what do you mean by "sleep".

> +
> +properties:
> +  compatible:
> +    const: qcom,rpm-master-stats
> +
> +  qcom,rpm-msg-ram:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description: Phandle to an RPM MSG RAM slice containing the master stats
> +    minItems: 1
> +    maxItems: 5
> +
> +  qcom,master-names:
> +    $ref: /schemas/types.yaml#/definitions/string-array
> +    description: RPM Master name

There is a relation between this and qcom,rpm-msg-ram which you do not
describe. It's not just RPM master name...

Best regards,
Krzysztof