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Message-ID: <20241021-gpu-acd-v2-2-9c25a62803bc@quicinc.com>
Date: Mon, 21 Oct 2024 17:23:43 +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 v2 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.
Cc: Rob Clark <robdclark@...il.com>
Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
---
.../bindings/opp/opp-v2-qcom-adreno.yaml | 96 ++++++++++++++++++++++
1 file changed, 96 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..6d50c0405ef8
--- /dev/null
+++ b/Documentation/devicetree/bindings/opp/opp-v2-qcom-adreno.yaml
@@ -0,0 +1,96 @@
+# 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:
+ - $ref: opp-v2-base.yaml#
+
+properties:
+ compatible:
+ items:
+ - const: operating-points-v2-adreno
+ - const: operating-points-v2
+
+patternProperties:
+ '^opp-?[0-9]+$':
+ 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 (Adaptive Clock Distribution,
+ a fancy name for clk throttling during voltage droop) level associated
+ with this OPP node. This value is shared to a co-processor inside GPU
+ (called Graphics Management Unit a.k.a GMU) during wake up. It may not
+ be present for some OPPs and GMU will disable ACD while transitioning
+ to that OPP. This value encodes a voltage threshold and few other knobs
+ which are identified by characterization of the SoC. So, it doesn't have
+ any unit.
+ $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", "operating-points-v2";
+
+ opp-687000000 {
+ opp-hz = /bits/ 64 <687000000>;
+ opp-level = <RPMH_REGULATOR_LEVEL_SVS_L1>;
+ opp-peak-kBps = <8171875>;
+ qcom,opp-acd-level = <0x882e5ffd>;
+ };
+
+ 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
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