soc: ti: k3: Add AM64 R5F core support

The TI AM64 SoC contains two dual-core R5F clusters. Add support for
all four of these cores here.

Signed-off-by: Andrew Davis <afd@ti.com>

dts/arm/ti/am64x_r5f0_0.dtsi

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2025 Texas Instruments Incorporated
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ti/am64x_r5.dtsi>
+
+&mbox2 {
+	usr-id = <0>;
+	status = "okay";
+};

dts/arm/ti/am64x_r5f0_1.dtsi

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2025 Texas Instruments Incorporated
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ti/am64x_r5.dtsi>
+
+&mbox2 {
+	usr-id = <1>;
+	status = "okay";
+};

dts/arm/ti/am64x_r5f1_0.dtsi

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2025 Texas Instruments Incorporated
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ti/am64x_r5.dtsi>
+
+&mbox4 {
+	usr-id = <0>;
+	status = "okay";
+};

dts/arm/ti/am64x_r5f1_1.dtsi

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2025 Texas Instruments Incorporated
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <ti/am64x_r5.dtsi>
+
+&mbox4 {
+	usr-id = <1>;
+	status = "okay";
+};

soc/ti/k3/am6x/Kconfig

@@ -39,4 +39,8 @@ config SOC_PART_NUMBER
 	default "AM6234" if SOC_AM6234_A53
 	default "AM6234" if SOC_AM6234_M4
 	default "AM6442" if SOC_AM6442_M4
+	default "AM6442" if SOC_AM6442_R5F0_0
+	default "AM6442" if SOC_AM6442_R5F0_1
+	default "AM6442" if SOC_AM6442_R5F1_0
+	default "AM6442" if SOC_AM6442_R5F1_1
 	default "J721e" if SOC_J721E_MAIN_R5F0_0

soc/ti/k3/am6x/Kconfig.soc

@@ -63,6 +63,22 @@ config SOC_J722S_MCU_R5F0_0
 	bool
 	select SOC_SERIES_AM6X_R5
 
+config SOC_AM6442_R5F0_0
+	bool
+	select SOC_SERIES_AM6X_R5
+
+config SOC_AM6442_R5F0_1
+	bool
+	select SOC_SERIES_AM6X_R5
+
+config SOC_AM6442_R5F1_0
+	bool
+	select SOC_SERIES_AM6X_R5
+
+config SOC_AM6442_R5F1_1
+	bool
+	select SOC_SERIES_AM6X_R5
+
 config SOC_SERIES
 	default "am6x" if SOC_SERIES_AM6X
 
@@ -71,5 +87,9 @@ config SOC
 	default "am6232" if SOC_AM6232_M4 || SOC_AM6232_A53
 	default "am6234" if SOC_AM6234_M4 || SOC_AM6234_A53
 	default "am6442" if SOC_AM6442_M4
+	default "am6442" if SOC_AM6442_R5F0_0
+	default "am6442" if SOC_AM6442_R5F0_1
+	default "am6442" if SOC_AM6442_R5F1_0
+	default "am6442" if SOC_AM6442_R5F1_1
 	default "j721e" if SOC_J721E_MAIN_R5F0_0
 	default "j722s" if SOC_J722S_MAIN_R5F0_0 || SOC_J722S_MCU_R5F0_0

soc/ti/k3/soc.yml

@@ -14,6 +14,10 @@ family:
     - name: am6442
       cpuclusters:
       - name: m4
+      - name: r5f0_0
+      - name: r5f0_1
+      - name: r5f1_0
+      - name: r5f1_1
     - name: am2434
       cpuclusters:
       - name: m4