soc: silabs: siwg917: Added 120Mhz soc clock features via DTS

Added support for 120Mhz soc clock via DTS.Setting the clock
to 120 MHz can improve throughput

Signed-off-by: Rahul Gurram <[email protected]>

Author: ragurram26

dts/arm/silabs/siwg917.dtsi

@@ -81,6 +81,7 @@
 		interrupt-parent = <&nvic>;
 		interrupts = <30 0>, <74 0>;
 		interrupt-names = "nwp_stack", "nwp_irq";
+		silabs-nwp-120mhz-clock-frequency;
 		status = "okay";
 
 		bt_hci0: bt_hci {

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

@@ -31,3 +31,11 @@ properties:
       - deep-sleep-without-ram-retention
       - deep-sleep-with-ram-retention
     required: true
+
+  silabs-nwp-120mhz-clock-frequency:
+    type: boolean
+    description: |
+      Enable the 120 MHz SoC clock configuration for SiWx91x devices.
+      Running the clock at 120 MHz can enhance throughput and support
+      demanding performance requirements. While recommended for high-
+      throughput use cases, it is not required for standard operation.

soc/silabs/silabs_siwx91x/siwg917/siwx91x_nwp.c

@@ -43,6 +43,7 @@ struct siwx91x_nwp_config {
 	void (*config_irq)(const struct device *dev);
 	uint32_t stack_size;
 	uint8_t power_profile;
+	bool silabs_nwp_120mhz_clock_frequency;
 };
 
 typedef struct {
@@ -311,6 +312,7 @@ static int siwx91x_get_nwp_config(const struct device *dev,
 				  sl_wifi_device_configuration_t *get_config,
 				  uint8_t wifi_oper_mode, bool hidden_ssid, uint8_t max_num_sta)
 {
+	const struct siwx91x_nwp_config *config = dev->config;
 	sl_wifi_device_configuration_t default_config = {
 		.region_code = siwx91x_map_country_code_to_region(DEFAULT_COUNTRY_CODE),
 		.band = SL_SI91X_WIFI_BAND_2_4GHZ,
@@ -352,6 +354,10 @@ static int siwx91x_get_nwp_config(const struct device *dev,
 	siwx91x_store_country_code(dev, DEFAULT_COUNTRY_CODE);
 	siwx91x_apply_sram_config(boot_config);
 
+	/* Apply TA clock configuration based on DT property */
+	if (config->silabs_nwp_120mhz_clock_frequency) {
+		boot_config->custom_feature_bit_map |= SL_SI91X_CUSTOM_FEAT_SOC_CLK_CONFIG_120MHZ;
+	}
 	switch (wifi_oper_mode) {
 	case WIFI_STA_MODE:
 		siwx91x_configure_sta_mode(boot_config);
@@ -472,7 +478,9 @@ BUILD_ASSERT(CONFIG_SIWX91X_NWP_INIT_PRIORITY < CONFIG_KERNEL_INIT_PRIORITY_DEFA
 	static const struct siwx91x_nwp_config siwx91x_nwp_config_##inst = {                       \
 		.config_irq = silabs_siwx91x_nwp_irq_configure_##inst,                             \
 		.power_profile = DT_ENUM_IDX(DT_DRV_INST(inst), power_profile),                    \
-		.stack_size = DT_INST_PROP(inst, stack_size)                                       \
+		.stack_size = DT_INST_PROP(inst, stack_size),                                      \
+		.silabs_nwp_120mhz_clock_frequency =                                               \
+			DT_INST_PROP(inst, silabs_nwp_120mhz_clock_frequency)                      \
 	};                                                                                         \
                                                                                                    \
 	/* Coprocessor uses value stored in IVT to store its stack. We can't use Z_ISR_DECLARE() */\