linux-kernel - [PATCH 1/8] dt-bindings: soc: qcom,rpmh-rsc: Limit power-domains requirement

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Message-Id: <20250318-topic-more_dt_bindings_fixes-v1-1-cb36882ea9cc@oss.qualcomm.com>
Date: Tue, 18 Mar 2025 19:35:14 +0100
From: Konrad Dybcio <konradybcio@...nel.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, cros-qcom-dts-watchers@...omium.org, 
 Marc Gonzalez <mgonzalez@...ebox.fr>, Dmitry Baryshkov <lumag@...nel.org>, 
 Arnaud Vrac <avrac@...ebox.fr>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>, 
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Konrad Dybcio <konrad.dybcio@....qualcomm.com>
Subject: [PATCH 1/8] dt-bindings: soc: qcom,rpmh-rsc: Limit power-domains
 requirement

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

Certain platforms (such as Chrome SDM845 and SC7180 with a TF-A running
as secure firmware) do not have a OSI-mode capable PSCI implementation.

That in turn means the PSCI-associated power domain which represents the
system's power state can't provide enough feedback to the RSC device.

Don't require power-domains on platforms where this may be the case.

Signed-off-by: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
---
 .../bindings/soc/qcom/qcom,rpmh-rsc.yaml           | 24 ++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,rpmh-rsc.yaml b/Documentation/devicetree/bindings/soc/qcom/qcom,rpmh-rsc.yaml
index af632d0e0355c56748ecac24f528dc2eec7d1193..f8b7428df6bc3caef2917b300ce47a91bb3f0fd0 100644
--- a/Documentation/devicetree/bindings/soc/qcom/qcom,rpmh-rsc.yaml
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,rpmh-rsc.yaml
@@ -44,7 +44,13 @@ description: |
 
 properties:
   compatible:
-    const: qcom,rpmh-rsc
+    oneOf:
+      - items:
+        - enum:
+          - qcom,sc7180-rpmh-apps-rsc
+          - qcom,sdm845-rpmh-apps-rsc
+        - const: qcom,rpmh-rsc
+      - const: qcom,rpmh-rsc
 
   interrupts:
     minItems: 1
@@ -124,7 +130,21 @@ required:
   - qcom,tcs-offset
   - reg
   - reg-names
-  - power-domains
+
+allOf:
+  # Some platforms may lack a OSI-mode PSCI implementation, which implies the
+  # system power domain can't provide feedback about entering power collapse
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - qcom,sc7180-rpmh-apps-rsc
+                - qcom,sdm845-rpmh-apps-rsc
+    then:
+      required:
+        - power-domains
 
 additionalProperties: false
 

-- 
2.48.1