linux-kernel - [PATCH 1/3] dt-bindings: power: Introduce 'assigned-performance-states' property

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Date:   Thu, 24 Dec 2020 16:42:08 +0530
From:   Roja Rani Yarubandi <rojay@...eaurora.org>
To:     ulf.hansson@...aro.org, robh+dt@...nel.org,
        bjorn.andersson@...aro.org, wsa@...nel.org
Cc:     swboyd@...omium.org, dianders@...omium.org,
        saiprakash.ranjan@...eaurora.org, mka@...omium.org,
        akashast@...eaurora.org, msavaliy@....qualcomm.com,
        parashar@...eaurora.org, rnayak@...eaurora.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        agross@...nel.org, linux-i2c@...r.kernel.org,
        Roja Rani Yarubandi <rojay@...eaurora.org>
Subject: [PATCH 1/3] dt-bindings: power: Introduce 'assigned-performance-states' property

While most devices within power-domains which support performance states,
scale the performance state dynamically, some devices might want to
set a static/default performance state while the device is active.
These devices typically would also run off a fixed clock and not support
dynamically scaling the device's performance, also known as DVFS
techniques.

Add a property 'assigned-performance-states' which client devices can
use to set this default performance state on their power-domains.

Signed-off-by: Roja Rani Yarubandi <rojay@...eaurora.org>
---
 .../bindings/power/power-domain.yaml          | 49 +++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/Documentation/devicetree/bindings/power/power-domain.yaml b/Documentation/devicetree/bindings/power/power-domain.yaml
index aed51e9dcb11..a42977a82d06 100644
--- a/Documentation/devicetree/bindings/power/power-domain.yaml
+++ b/Documentation/devicetree/bindings/power/power-domain.yaml
@@ -66,6 +66,18 @@ properties:
       by the given provider should be subdomains of the domain specified
       by this binding.
 
+  assigned-performance-states:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description:
+       Some devices might need to configure their power domains in a default
+       performance state while the device is active. These devices typcially
+       would also run off a fixed clock and not support dynamically scaling
+       the device's performance, also known as DVFS techniques. Each cell in
+       performance state value corresponds to one power domain specified as
+       part of the power-domains property. Performance state value can be an
+       opp-level inside an OPP table of the power-domain and need not match
+       with any OPP table performance state.
+
 required:
   - "#power-domain-cells"
 
@@ -131,3 +143,40 @@ examples:
             min-residency-us = <7000>;
         };
     };
+
+  - |
+    parent4: power-controller@...40000 {
+        compatible = "foo,power-controller";
+        reg = <0x12340000 0x1000>;
+        #power-domain-cells = <0>;
+    };
+
+    parent5: power-controller@...10000 {
+        compatible = "foo,power-controller";
+        reg = <0x43210000 0x1000>;
+        #power-domain-cells = <0>;
+        operating-points-v2 = <&power_opp_table>;
+
+        power_opp_table: opp-table {
+            compatible = "operating-points-v2";
+
+            power_opp_low: opp1 {
+                opp-level = <16>;
+            };
+
+            rpmpd_opp_ret: opp2 {
+                opp-level = <64>;
+            };
+
+            rpmpd_opp_svs: opp3 {
+                opp-level = <256>;
+            };
+        };
+    };
+
+    child4: consumer@...41000 {
+        compatible = "foo,consumer";
+        reg = <0x12341000 0x1000>;
+        power-domains = <&parent4>, <&parent5>;
+        assigned-performance-states = <0>, <256>;
+    };
-- 
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