diff --git a/drivers/entropy/entropy_gecko_trng.c b/drivers/entropy/entropy_gecko_trng.c
index 8eda146c52ef9..1eec4ff5edf45 100644
--- a/drivers/entropy/entropy_gecko_trng.c
+++ b/drivers/entropy/entropy_gecko_trng.c
@@ -76,17 +76,16 @@ static int entropy_gecko_trng_get_entropy(const struct device *dev,
 
 	ARG_UNUSED(dev);
 
+#ifdef CONFIG_CRYPTO_ACC_GECKO_TRNG
+	CMU_ClockEnable(cmuClock_CRYPTOACC, true);
+#endif
+
 	while (length) {
 #ifndef CONFIG_CRYPTO_ACC_GECKO_TRNG
 		available = TRNG0->FIFOLEVEL * 4;
 #else
-		CMU_ClockEnable(cmuClock_CRYPTOACC, true);
 		available = S2_FIFO_LEVEL * 4;
 #endif
-		if (available == 0) {
-			return -EINVAL;
-		}
-
 		count = SL_MIN(length, available);
 		entropy_gecko_trng_read(buffer, count);
 		buffer += count;
diff --git a/soc/silabs/silabs_siwx91x/Kconfig.defconfig b/soc/silabs/silabs_siwx91x/Kconfig.defconfig
index 28db3e653709e..848201bca2532 100644
--- a/soc/silabs/silabs_siwx91x/Kconfig.defconfig
+++ b/soc/silabs/silabs_siwx91x/Kconfig.defconfig
@@ -13,6 +13,22 @@ configdefault SYS_CLOCK_TICKS_PER_SEC
 configdefault UART_NS16550_DW8250_DW_APB
 	default y
 
+configdefault ZERO_LATENCY_IRQS
+	default y
+
+configdefault ZERO_LATENCY_LEVELS
+	default 2
+
+if PM_DEVICE
+
+configdefault PM_DEVICE_RUNTIME
+	default y
+
+configdefault POWER_DOMAIN
+	default y
+
+endif # PM_DEVICE
+
 if SILABS_SIWX91X_NWP
 
 # WiseConnect create threads with realtime priority. Default (10kHz) clock tick