esp_adc: support h2 oneshot mode and continuous mode

components/driver/test_apps/legacy_adc_driver/README.md

@@ -1,2 +1,2 @@
-| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-S2 | ESP32-S3 |
-| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- |
+| Supported Targets | ESP32 | ESP32-C2 | ESP32-C3 | ESP32-C6 | ESP32-H2 | ESP32-S2 | ESP32-S3 |
+| ----------------- | ----- | -------- | -------- | -------- | -------- | -------- | -------- |

components/driver/test_apps/legacy_adc_driver/main/test_legacy_adc.c

@@ -1,5 +1,5 @@
 /*
- * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ * SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
  *
  * SPDX-License-Identifier: Unlicense OR CC0-1.0
  */
@@ -60,6 +60,13 @@
 #define ADC_TEST_HIGH_VAL        4081
 #define ADC_TEST_HIGH_THRESH     200
 
+#elif CONFIG_IDF_TARGET_ESP32H2  // TODO: IDF-6216
+#define ADC_TEST_LOW_VAL         2144
+#define ADC_TEST_LOW_THRESH      200
+
+#define ADC_TEST_HIGH_VAL        4081
+#define ADC_TEST_HIGH_THRESH     200
+
 #endif
 
 //ADC Channels

components/driver/test_apps/legacy_adc_driver/pytest_legacy_adc.py

@@ -10,6 +10,7 @@ from pytest_embedded import Dut
 @pytest.mark.esp32s3
 @pytest.mark.esp32c3
 @pytest.mark.esp32c6
+@pytest.mark.esp32h2
 @pytest.mark.adc
 @pytest.mark.parametrize(
     'config',