[PATCH 2/9] dt-bindings: pinctrl: stm32: Introduce HDP

[Clément Le Goffic <clement.legoffic@xxxxxxxxxxx>]

Introduce dt-bindings for HDP driver.

'HDP' stands for Hardware Debug Port, it is an hardware block in
STMicrolectronics' MPUs that let the user decide which internal SoC's
signal to observe.
It provides 8 ports and for each port there is up to 16 different
signals that can be output.
Signals are different for each MPU.

Signed-off-by: Clément Le Goffic <clement.legoffic@xxxxxxxxxxx>
---
 .../bindings/pinctrl/st,stm32-pinctrl-hdp.yaml     | 72 ++++++++++++++++++++++
 1 file changed, 72 insertions(+)

diff --git a/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl-hdp.yaml b/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl-hdp.yaml
new file mode 100644
index 000000000000..b6787162faaa
--- /dev/null
+++ b/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl-hdp.yaml
@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) STMicroelectronics 2025.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/pinctrl/st,stm32-pinctrl-hdp.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STM32 Hardware Debug Port Mux/Config
+
+maintainers:
+  - Clément LE GOFFIC <clement.legoffic@xxxxxxxxxxx>
+
+description: |
+  STMicroelectronics's STM32 MPUs integrate a Hardware Debug Port (HDP).
+  It allows to output internal signals on SoC's GPIO.
+
+properties:
+  compatible:
+    const: st,stm32mp-hdp
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+patternProperties:
+  '-pins$':
+    type: object
+    $ref: pinmux-node.yaml#
+
+    properties:
+      function:
+        enum: [ "0", "1", "2", "3", "4", "5", "6", "7",
+                "8", "9", "10", "11", "12", "13", "14",
+                "15" ]
+
+      pins:
+        enum: [ hdp0, hdp1, hdp2, hdp3, hdp4, hdp5, hdp6, hdp7 ]
+
+    required:
+      - function
+      - pins
+
+    additionalProperties: false
+
+allOf:
+  - $ref: pinctrl.yaml#
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/stm32mp1-clks.h>
+    #include <dt-bindings/pinctrl/stm32mp15-hdp.h>
+    //Example 1
+    pinctrl@54090000 {
+      compatible = "st,stm32mp-hdp";
+      reg = <0x54090000 0x400>;
+      clocks = <&rcc HDP>;
+      pinctrl-names = "default";
+      pinctrl-0 = <&hdp2>;
+      hdp2-pins {
+        function = HDP2_GPOVAL_2;
+        pins = "hdp2";
+      };
+    };

-- 
2.43.0