linux-kernel - [PATCH RFC 05/24] dt-bindings: clock: qcom,gpucc: Sort out SA8540P constraints

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Message-Id: <20250728-topic-gpucc_power_plumbing-v1-5-09c2480fe3e6@oss.qualcomm.com>
Date: Mon, 28 Jul 2025 18:16:05 +0200
From: Konrad Dybcio <konradybcio@...nel.org>
To: Ulf Hansson <ulf.hansson@...aro.org>, 
 Johan Hovold <johan+linaro@...nel.org>, 
 Bjorn Andersson <andersson@...nel.org>, 
 Taniya Das <taniya.das@....qualcomm.com>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Taniya Das <quic_tdas@...cinc.com>, 
 Imran Shaik <quic_imrashai@...cinc.com>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, 
 Dmitry Baryshkov <lumag@...nel.org>, cros-qcom-dts-watchers@...omium.org, 
 Douglas Anderson <dianders@...omium.org>, Vinod Koul <vkoul@...nel.org>, 
 Richard Acayan <mailingradian@...il.com>, 
 Andy Gross <andy.gross@...aro.org>, Ajit Pandey <quic_ajipan@...cinc.com>, 
 Luca Weiss <luca.weiss@...rphone.com>, Jonathan Marek <jonathan@...ek.ca>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Jagadeesh Kona <quic_jkona@...cinc.com>, 
 Akhil P Oommen <akhilpo@....qualcomm.com>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, linux-pm@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org, 
 devicetree@...r.kernel.org, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH RFC 05/24] dt-bindings: clock: qcom,gpucc: Sort out SA8540P
 constraints

From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>

The platform in question is a close cousin of SC8280XP, most notably
lacking an on-SoC VDD_GFX rail, substituting it with an external
regulator.

The GPU_CC block was previously believed to only require a handle to
some form of VDD_GFX, but that's now known not to be enough.

Introduce a new compatible, using the SC8280XP fallback, to constrain
a different number of power-domains and remove the pd-regulator
exclusivity check, as it no longer applies.

Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
 .../devicetree/bindings/clock/qcom,gpucc.yaml      | 65 +++++++++++++---------
 1 file changed, 38 insertions(+), 27 deletions(-)

diff --git a/Documentation/devicetree/bindings/clock/qcom,gpucc.yaml b/Documentation/devicetree/bindings/clock/qcom,gpucc.yaml
index 1a6f8889db35296b59973c90b8133abfed75baaf..3beb8f2c3d7a1b3f820c6452fc4000e6cfa14070 100644
--- a/Documentation/devicetree/bindings/clock/qcom,gpucc.yaml
+++ b/Documentation/devicetree/bindings/clock/qcom,gpucc.yaml
@@ -37,27 +37,31 @@ description: |
 
 properties:
   compatible:
-    enum:
-      - qcom,milos-gpucc
-      - qcom,qcs8300-gpucc
-      - qcom,sa8775p-gpucc
-      - qcom,sar2130p-gpucc
-      - qcom,sc7180-gpucc
-      - qcom,sc7280-gpucc
-      - qcom,sc8180x-gpucc
-      - qcom,sc8280xp-gpucc
-      - qcom,sdm845-gpucc
-      - qcom,sm4450-gpucc
-      - qcom,sm6350-gpucc
-      - qcom,sm8150-gpucc
-      - qcom,sm8250-gpucc
-      - qcom,sm8350-gpucc
-      - qcom,sm8450-gpucc
-      - qcom,sm8475-gpucc
-      - qcom,sm8550-gpucc
-      - qcom,sm8650-gpucc
-      - qcom,x1e80100-gpucc
-      - qcom,x1p42100-gpucc
+    oneOf:
+      - enum:
+          - qcom,milos-gpucc
+          - qcom,qcs8300-gpucc
+          - qcom,sa8775p-gpucc
+          - qcom,sar2130p-gpucc
+          - qcom,sc7180-gpucc
+          - qcom,sc7280-gpucc
+          - qcom,sc8180x-gpucc
+          - qcom,sc8280xp-gpucc
+          - qcom,sdm845-gpucc
+          - qcom,sm4450-gpucc
+          - qcom,sm6350-gpucc
+          - qcom,sm8150-gpucc
+          - qcom,sm8250-gpucc
+          - qcom,sm8350-gpucc
+          - qcom,sm8450-gpucc
+          - qcom,sm8475-gpucc
+          - qcom,sm8550-gpucc
+          - qcom,sm8650-gpucc
+          - qcom,x1e80100-gpucc
+          - qcom,x1p42100-gpucc
+      - items:
+          - const: qcom,sa8540p-gpucc
+          - const: qcom,sc8280xp-gpucc
 
   clocks:
     items:
@@ -86,12 +90,6 @@ required:
   - power-domains
   - '#power-domain-cells'
 
-# Require that power-domains and vdd-gfx-supply are not both present
-not:
-  required:
-    - power-domains
-    - vdd-gfx-supply
-
 allOf:
   - $ref: qcom,gcc.yaml#
 
@@ -151,6 +149,19 @@ allOf:
             - description: CX power domain
             - description: MX power domain
 
+  - if:
+      properties:
+        compatible:
+          enum:
+            - qcom,sa8540p-gpucc
+    then:
+      properties:
+        power-domains:
+          items:
+            - description: CX power domain
+            - description: MX power domain
+            - description: MX_COLLAPSIBLE power domain
+
   - if:
       properties:
         compatible:

-- 
2.50.1