boards: nordic: Add retention using GPREGRET1 for boot mode

Enables GPREGRET1 and assigns it as a retention device for use
with boot mode selection

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

boards/nordic/bm_nrf54l05_template/cpuapp_common.dtsi

@@ -10,6 +10,7 @@
 
 	chosen {
 		zephyr,flash-controller = &rram_controller;
+		zephyr,boot-mode = &boot_mode0;
 	};
 };
 
@@ -24,6 +25,16 @@
 	reg = <0x0 DT_SIZE_K(500)>;
 };
 
+&gpregret1 {
+	status = "okay";
+
+	boot_mode0: boot_mode@0 {
+		compatible = "zephyr,retention";
+		status = "okay";
+		reg = <0x0 0x1>;
+	};
+};
+
 &grtc {
 	owned-channels = <0 1 2 3 4 5 6 7 8 9 10 11>;
 	/* Channels 7-11 reserved for Zero Latency IRQs, 3-4 for FLPR */

boards/nordic/bm_nrf54l10_template/cpuapp_common.dtsi

@@ -10,6 +10,7 @@
 
 	chosen {
 		zephyr,flash-controller = &rram_controller;
+		zephyr,boot-mode = &boot_mode0;
 	};
 };
 
@@ -24,6 +25,16 @@
 	reg = <0x0 DT_SIZE_K(1022)>;
 };
 
+&gpregret1 {
+	status = "okay";
+
+	boot_mode0: boot_mode@0 {
+		compatible = "zephyr,retention";
+		status = "okay";
+		reg = <0x0 0x1>;
+	};
+};
+
 &grtc {
 	owned-channels = <0 1 2 3 4 5 6 7 8 9 10 11>;
 	/* Channels 7-11 reserved for Zero Latency IRQs, 3-4 for FLPR */

boards/nordic/bm_nrf54l15_template/cpuapp_common.dtsi

@@ -10,6 +10,7 @@
 
 	chosen {
 		zephyr,flash-controller = &rram_controller;
+		zephyr,boot-mode = &boot_mode0;
 	};
 };
 
@@ -24,6 +25,16 @@
 	reg = <0x0 DT_SIZE_K(1524)>;
 };
 
+&gpregret1 {
+	status = "okay";
+
+	boot_mode0: boot_mode@0 {
+		compatible = "zephyr,retention";
+		status = "okay";
+		reg = <0x0 0x1>;
+	};
+};
+
 &grtc {
 	owned-channels = <0 1 2 3 4 5 6 7 8 9 10 11>;
 	/* Channels 7-11 reserved for Zero Latency IRQs, 3-4 for FLPR */

boards/nordic/bm_nrf54l15dk/bm_nrf54l15dk_nrf54l05_cpuapp_common.dtsi

@@ -10,6 +10,7 @@
 
 	chosen {
 		zephyr,flash-controller = &rram_controller;
+		zephyr,boot-mode = &boot_mode0;
 	};
 };
 
@@ -24,6 +25,16 @@
 	reg = <0x0 DT_SIZE_K(500)>;
 };
 
+&gpregret1 {
+	status = "okay";
+
+	boot_mode0: boot_mode@0 {
+		compatible = "zephyr,retention";
+		status = "okay";
+		reg = <0x0 0x1>;
+	};
+};
+
 &grtc {
 	owned-channels = <0 1 2 3 4 5 6 7 8 9 10 11>;
 	/* Channels 7-11 reserved for Zero Latency IRQs, 3-4 for FLPR */

boards/nordic/bm_nrf54l15dk/bm_nrf54l15dk_nrf54l10_cpuapp_common.dtsi

@@ -10,6 +10,7 @@
 
 	chosen {
 		zephyr,flash-controller = &rram_controller;
+		zephyr,boot-mode = &boot_mode0;
 	};
 };
 
@@ -24,6 +25,16 @@
 	reg = <0x0 DT_SIZE_K(1022)>;
 };
 
+&gpregret1 {
+	status = "okay";
+
+	boot_mode0: boot_mode@0 {
+		compatible = "zephyr,retention";
+		status = "okay";
+		reg = <0x0 0x1>;
+	};
+};
+
 &grtc {
 	owned-channels = <0 1 2 3 4 5 6 7 8 9 10 11>;
 	/* Channels 7-11 reserved for Zero Latency IRQs, 3-4 for FLPR */

boards/nordic/bm_nrf54l15dk/bm_nrf54l15dk_nrf54l15_cpuapp_common.dtsi

@@ -10,6 +10,7 @@
 
 	chosen {
 		zephyr,flash-controller = &rram_controller;
+		zephyr,boot-mode = &boot_mode0;
 	};
 };
 
@@ -24,6 +25,16 @@
 	reg = <0x0 DT_SIZE_K(1524)>;
 };
 
+&gpregret1 {
+	status = "okay";
+
+	boot_mode0: boot_mode@0 {
+		compatible = "zephyr,retention";
+		status = "okay";
+		reg = <0x0 0x1>;
+	};
+};
+
 &grtc {
 	owned-channels = <0 1 2 3 4 5 6 7 8 9 10 11>;
 	/* Channels 7-11 reserved for Zero Latency IRQs, 3-4 for FLPR */