linux-kernel - [PATCH 03/11] dt-bindings: bus: document the stm32 debug bus

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Message-ID: <20260109-debug_bus-v1-3-8f2142b5a738@foss.st.com>
Date: Fri, 9 Jan 2026 11:55:03 +0100
From: Gatien Chevallier <gatien.chevallier@...s.st.com>
To: Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach
	<mike.leach@...aro.org>,
        James Clark <james.clark@...aro.org>, Rob Herring
	<robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Leo Yan
	<leo.yan@...ux.dev>,
        Clément Le Goffic
	<legoffic.clement@...il.com>,
        Linus Walleij <linusw@...nel.org>,
        "Maxime
 Coquelin" <mcoquelin.stm32@...il.com>,
        Alexandre Torgue
	<alexandre.torgue@...s.st.com>
CC: <coresight@...ts.linaro.org>, <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-gpio@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        Gatien Chevallier <gatien.chevallier@...s.st.com>
Subject: [PATCH 03/11] dt-bindings: bus: document the stm32 debug bus

Document the stm32 debug bus. The debug bus is responsible for
checking the debug sub-system accessibility before probing any related
drivers.

Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
---
 .../bindings/bus/st,stm32mp131-dbg-bus.yaml        | 86 ++++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/Documentation/devicetree/bindings/bus/st,stm32mp131-dbg-bus.yaml b/Documentation/devicetree/bindings/bus/st,stm32mp131-dbg-bus.yaml
new file mode 100644
index 000000000000..68bdfba08909
--- /dev/null
+++ b/Documentation/devicetree/bindings/bus/st,stm32mp131-dbg-bus.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/bus/st,stm32mp131-dbg-bus.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STM32 Coresight bus
+
+maintainers:
+  - Gatien Chevallier <gatien.chevallier@...s.st.com>
+
+description: |
+  The STM32 debug bus is in charge of checking the debug configuration
+  of the platform before probing the peripheral drivers that rely on the debug
+  domain.
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - st,stm32mp131-dbg-bus
+              - st,stm32mp151-dbg-bus
+
+  "#address-cells":
+    const: 1
+
+  "#size-cells":
+    const: 1
+
+  clocks:
+    maxItems: 1
+
+  ranges: true
+
+  reg:
+    maxItems: 1
+
+  "#access-controller-cells":
+    const: 1
+    description:
+      Contains the debug profile necessary to access the peripheral.
+
+patternProperties:
+  "^.*@[0-9a-f]+$":
+    description: Debug related peripherals
+    type: object
+
+    additionalProperties: true
+
+    required:
+      - access-controllers
+
+required:
+  - "#access-controller-cells"
+  - "#address-cells"
+  - "#size-cells"
+  - clocks
+  - compatible
+  - ranges
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/stm32mp1-clks.h>
+
+    dbg_bus: bus@...80000 {
+      compatible = "st,stm32mp131-dbg-bus";
+      reg = <0x50080000 0x3f80000>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+      clocks = <&rcc CK_DBG>;
+      #access-controller-cells = <1>;
+      ranges;
+
+      cs_cti_trace: cti@...94000 {
+        compatible = "arm,coresight-cti", "arm,primecell";
+        reg = <0x50094000 0x1000>;
+        clocks = <&rcc CK_DBG>;
+        clock-names = "apb_pclk";
+        access-controllers = <&dbg_bus 0>;
+        status = "disabled";
+      };
+    };

-- 
2.43.0