linux-kernel - [PATCH 05/12] dt-bindings: arm: stm32: add required #clock-cells property

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Message-ID: <20250725-drm-misc-next-v1-5-a59848e62cf9@foss.st.com>
Date: Fri, 25 Jul 2025 12:03:57 +0200
From: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
To: Yannick Fertre <yannick.fertre@...s.st.com>,
        Philippe Cornu
	<philippe.cornu@...s.st.com>,
        Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Rob Herring <robh@...nel.org>,
        Krzysztof
 Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Maxime
 Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Christophe Roullier
	<christophe.roullier@...s.st.com>
CC: <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 05/12] dt-bindings: arm: stm32: add required #clock-cells
 property

On STM32MP25 SoC, the syscfg peripheral provides a clock to the display
subsystem through a multiplexer.  Since it only provides a single clock,
the cell value is 0.

Doing so allows the clock consumers to reach the peripheral and gate the
clock accordingly.

Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@...s.st.com>
---
 .../bindings/arm/stm32/st,stm32-syscon.yaml        | 31 +++++++++++++++-------
 1 file changed, 21 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
index ed97652c84922813e94b1818c07fe8714891c089..95d2319afe235fa86974d80f89c9deeae2275232 100644
--- a/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
+++ b/Documentation/devicetree/bindings/arm/stm32/st,stm32-syscon.yaml
@@ -36,20 +36,31 @@ properties:
   clocks:
     maxItems: 1
 
+  "#clock-cells":
+    const: 0
+
 required:
   - compatible
   - reg
 
-if:
-  properties:
-    compatible:
-      contains:
-        enum:
-          - st,stm32mp157-syscfg
-          - st,stm32f4-gcan
-then:
-  required:
-    - clocks
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - st,stm32mp157-syscfg
+              - st,stm32f4-gcan
+    then:
+      required:
+        - clocks
+  - if:
+      properties:
+        compatible:
+          const: st,stm32mp25-syscfg
+    then:
+      required:
+        - "#clock-cells"
 
 additionalProperties: false
 

-- 
2.25.1