dts: bindings: debug: Add Silicon Labs Packet Trace Interface

Add bindings and DTS nodes for the Packet Trace Interface of the radio.

Signed-off-by: Aksel Skauge Mellbye <aksel.mellbye@silabs.com>

dts/arm/silabs/xg21/efr32xg21.dtsi

@@ -19,6 +19,13 @@
 			pa-ramp-time-us = <10>;
 			pa-voltage-mv = <3300>;
 			pa-2p4ghz = "highest";
+
+			pti: pti {
+				compatible = "silabs,pti";
+				clock-frequency = <DT_FREQ_K(1600)>;
+				mode = "uart";
+				status = "disabled";
+			};
 		};
 	};
 };

dts/arm/silabs/xg22/efr32xg22.dtsi

@@ -21,6 +21,12 @@
 			pa-voltage-mv = <3300>;
 			pa-2p4ghz = "highest";
 
+			pti: pti {
+				compatible = "silabs,pti";
+				clock-frequency = <DT_FREQ_K(1600)>;
+				mode = "uart";
+				status = "disabled";
+			};
 		};
 	};
 };

dts/arm/silabs/xg23/efr32xg23.dtsi

@@ -20,6 +20,13 @@
 			pa-ramp-time-us = <10>;
 			pa-voltage-mv = <3300>;
 			pa-subghz = "highest";
+
+			pti: pti {
+				compatible = "silabs,pti";
+				clock-frequency = <DT_FREQ_K(1600)>;
+				mode = "uart";
+				status = "disabled";
+			};
 		};
 	};
 };

dts/arm/silabs/xg24/efr32xg24.dtsi

@@ -25,6 +25,13 @@
 				compatible = "silabs,bt-hci-efr32";
 				status = "disabled";
 			};
+
+			pti: pti {
+				compatible = "silabs,pti";
+				clock-frequency = <DT_FREQ_K(1600)>;
+				mode = "uart";
+				status = "disabled";
+			};
 		};
 	};
 };

dts/arm/silabs/xg27/efr32xg27.dtsi

@@ -25,6 +25,13 @@
 				compatible = "silabs,bt-hci-efr32";
 				status = "disabled";
 			};
+
+			pti: pti {
+				compatible = "silabs,pti";
+				clock-frequency = <DT_FREQ_K(1600)>;
+				mode = "uart";
+				status = "disabled";
+			};
 		};
 	};
 };

dts/arm/silabs/xg29/efr32xg29.dtsi

@@ -25,6 +25,13 @@
 				compatible = "silabs,bt-hci-efr32";
 				status = "disabled";
 			};
+
+			pti: pti {
+				compatible = "silabs,pti";
+				clock-frequency = <DT_FREQ_K(1600)>;
+				mode = "uart";
+				status = "disabled";
+			};
 		};
 	};
 };

dts/bindings/debug/silabs,pti.yaml

@@ -0,0 +1,24 @@
+# Copyright (c) 2025 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+description: Silicon Labs Packet Trace Interface
+
+compatible: "silabs,pti"
+
+include: [base.yaml, pinctrl-device.yaml]
+
+properties:
+  clock-frequency:
+    type: int
+    description: |
+      Clock frequency for PTI signal in Hz.
+
+  mode:
+    type: string
+    enum:
+      - disabled
+      - spi
+      - uart
+      - uart-onewire
+    description: |
+      Packet Trace mode.