soc: silabs: siwx91x: Add configurable power profile support via DeviceTree

This commit adds support for configuring the power/performance
profile for the siwx91x device using a generic
'power-profile' property in DeviceTree.
The property is available for NWP nodes,
allowing flexible selection of power management
profiles per application or board via overlay.

Signed-off-by: S Mohamed Fiaz <fiaz.mohamed@silabs.com>

dts/arm/silabs/siwg917.dtsi

@@ -72,14 +72,19 @@
 		zephyr,memory-attr = <DT_MEM_ARM(ATTR_MPU_RAM_NOCACHE)>;
 	};
 
-	bt_hci0: bt_hci {
+	nwp: nwp {
-		compatible = "silabs,siwx91x-bt-hci";
+		compatible = "silabs,siwx91x-nwp";
-		status = "disabled";
+		power-profile = "high-performance";
-	};
 
-	wifi0: wifi {
+		bt_hci0: bt_hci {
-		compatible = "silabs,siwx91x-wifi";
+			compatible = "silabs,siwx91x-bt-hci";
-		status = "disabled";
+			status = "disabled";
+		};
+
+		wifi0: wifi {
+			compatible = "silabs,siwx91x-wifi";
+			status = "disabled";
+		};
 	};
 
 	soc {

dts/bindings/net/wireless/silabs,siwx91x-nwp.yaml

@@ -0,0 +1,23 @@
+# Copyright (c) 2025 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+title: Silicon Labs SiWx91x NWP (Network Wireless Processor)
+
+description: |
+  The Network Wireless Processor (NWP) manages Wi-Fi and Bluetooth connectivity on SiWx91x devices,
+  offloading wireless networking tasks from the main processor and
+  supporting configurable power and performance modes.
+
+compatible: "silabs,siwx91x-nwp"
+
+properties:
+  power-profile:
+    type: string
+    description: Power/performance profile
+    enum:
+      - high-performance
+      - associated-power-save
+      - associated-power-save-low-latency
+      - deep-sleep-without-ram-retention
+      - deep-sleep-with-ram-retention
+    required: true

soc/silabs/silabs_siwx91x/siwg917/nwp.c

@@ -13,6 +13,7 @@
 #include <zephyr/kernel.h>
 #include <zephyr/net/wifi.h>
 #include <zephyr/logging/log.h>
+#include <zephyr/devicetree.h>
 
 #include "nwp.h"
 #include "sl_wifi_callback_framework.h"
@@ -21,6 +22,8 @@
 #endif
 #include "sl_si91x_power_manager.h"
 
+#define NWP_NODE            DT_NODELABEL(nwp)
+#define SI91X_POWER_PROFILE DT_ENUM_IDX(NWP_NODE, power_profile)
 #define AP_MAX_NUM_STA 4
 
 LOG_MODULE_REGISTER(siwx91x_nwp);
@@ -245,7 +248,7 @@ static int siwg917_nwp_init(void)
 	sl_wifi_device_configuration_t network_config;
 	sl_status_t status;
 	__maybe_unused sl_wifi_performance_profile_t performance_profile = {
-		.profile = DEEP_SLEEP_WITH_RAM_RETENTION};
+		.profile = SI91X_POWER_PROFILE};
 
 	siwx91x_get_nwp_config(&network_config, WIFI_STA_MODE, false, 0);
 	/* TODO: If sl_net_*_profile() functions will be needed for WiFi then call