esp32s2: drivers: entropy: add support

also needed for wifi driver support.

Signed-off-by: Glauber Maroto Ferreira <glauber.ferreira@espressif.com>

boards/xtensa/esp32s2_saola/Kconfig.defconfig

@@ -6,3 +6,9 @@
 config BOARD
 	default "esp32s2_saola"
 	depends on BOARD_ESP32S2_SAOLA
+
+config ENTROPY_GENERATOR
+	default y
+
+config ENTROPY_ESP32_RNG
+	default y if ENTROPY_GENERATOR

boards/xtensa/esp32s2_saola/esp32s2_saola.dts

@@ -43,3 +43,7 @@
 &timer3 {
 	status = "okay";
 };
+
+&trng0 {
+	status = "okay";
+};

drivers/entropy/Kconfig.esp32

@@ -5,7 +5,7 @@
 
 config ENTROPY_ESP32_RNG
 	bool "ESP32 entropy number generator driver"
-	depends on SOC_ESP32 || SOC_ESP32C3
+	depends on SOC_ESP32 || SOC_ESP32C3 || SOC_ESP32S2
 	select ENTROPY_HAS_DRIVER
 	default y
 	help

dts/xtensa/espressif/esp32s2.dtsi

@@ -13,6 +13,10 @@
 	#address-cells = <1>;
 	#size-cells = <1>;
 
+	chosen {
+		zephyr,entropy = &trng0;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;
@@ -127,6 +131,12 @@
 			interrupts = <TG1_T1_LEVEL_INTR_SOURCE>;
 			interrupt-parent = <&intc>;
 			label = "TIMG1_T1";
+		};
+
+		trng0: trng@3f435110 {
+			compatible = "espressif,esp32-trng";
+			reg = <0x3f435110 0x4>;
+			label = "TRNG_0";
 			status = "disabled";
 		};
 	};