linux-kernel - [PATCH RFC 2/3] dt-bindings: opp: Add v2-qcom-adreno vendor bindings

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Message-ID: <20241012-gpu-acd-v1-2-1e5e91aa95b6@quicinc.com>
Date: Sat, 12 Oct 2024 01:59:29 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        "Konrad
 Dybcio" <konradybcio@...nel.org>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Simona
 Vetter" <simona@...ll.ch>,
        Viresh Kumar <vireshk@...nel.org>, Nishanth Menon
	<nm@...com>,
        Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Akhil P Oommen <quic_akhilpo@...cinc.com>,
        Bjorn Andersson
	<andersson@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH RFC 2/3] dt-bindings: opp: Add v2-qcom-adreno vendor
 bindings

Add a new schema which extends opp-v2 to support a new vendor specific
property required for Adreno GPUs found in Qualcomm's SoCs. The new
property called "qcom,opp-acd-level" carries a u32 value recommended
for each opp needs to be shared to GMU during runtime.

Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
---
 .../bindings/opp/opp-v2-qcom-adreno.yaml           | 84 ++++++++++++++++++++++
 1 file changed, 84 insertions(+)

diff --git a/Documentation/devicetree/bindings/opp/opp-v2-qcom-adreno.yaml b/Documentation/devicetree/bindings/opp/opp-v2-qcom-adreno.yaml
new file mode 100644
index 000000000000..9fb828e9da86
--- /dev/null
+++ b/Documentation/devicetree/bindings/opp/opp-v2-qcom-adreno.yaml
@@ -0,0 +1,84 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/opp/opp-v2-qcom-adreno.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Adreno compatible OPP supply
+
+description:
+  Adreno GPUs present in Qualcomm's Snapdragon chipsets uses an OPP specific
+  ACD related information tailored for the specific chipset. This binding
+  provides the information needed to describe such a hardware value.
+
+maintainers:
+  - Rob Clark <robdclark@...il.com>
+
+allOf:
+  - $ref: opp-v2-base.yaml#
+
+properties:
+  compatible:
+    const: operating-points-v2-adreno
+
+patternProperties:
+  '^opp-?[0-9]+$':
+    type: object
+    additionalProperties: false
+
+    properties:
+      opp-hz: true
+
+      opp-level: true
+
+      opp-peak-kBps: true
+
+      opp-supported-hw: true
+
+      qcom,opp-acd-level:
+        description: |
+          A positive value representing the acd level associated with this
+          OPP node. This value is shared to GMU during GPU wake up. It may
+          not be present for some OPPs and GMU will disable ACD while
+          transitioning to that OPP.
+        $ref: /schemas/types.yaml#/definitions/uint32
+
+    required:
+      - opp-hz
+      - opp-level
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+
+    #include <dt-bindings/power/qcom-rpmpd.h>
+
+    gpu_opp_table: opp-table {
+        compatible = "operating-points-v2-adreno";
+
+        opp-550000000 {
+                opp-hz = /bits/ 64 <550000000>;
+                opp-level = <RPMH_REGULATOR_LEVEL_SVS>;
+                opp-peak-kBps = <6074219>;
+                qcom,opp-acd-level = <0xc0285ffd>;
+        };
+
+        opp-390000000 {
+                opp-hz = /bits/ 64 <390000000>;
+                opp-level = <RPMH_REGULATOR_LEVEL_LOW_SVS>;
+                opp-peak-kBps = <3000000>;
+                qcom,opp-acd-level = <0xc0285ffd>;
+        };
+
+        opp-300000000 {
+                opp-hz = /bits/ 64 <300000000>;
+                opp-level = <RPMH_REGULATOR_LEVEL_LOW_SVS_D1>;
+                opp-peak-kBps = <2136719>;
+                /* Intentionally left out qcom,opp-acd-level property here */
+        };
+
+    };

-- 
2.45.2