adc: support ADC on esp32c6 (driver/test/example)

components/soc/esp32c3/include/soc/Kconfig.soc_caps.in

@@ -175,6 +175,10 @@ config SOC_ADC_ATTEN_NUM
     int
     default 4
 
+config SOC_ADC_DIGI_SEGMENTED_THRESH
+    bool
+    default y
+
 config SOC_ADC_DIGI_CONTROLLER_NUM
     int
     default 1

components/soc/esp32c3/include/soc/clk_tree_defs.h

@@ -284,8 +284,8 @@ typedef enum {
  * @brief ADC digital controller clock source
  */
 typedef enum {
-    ADC_DIGI_CLK_SRC_APB = SOC_MOD_CLK_APB,
-    ADC_DIGI_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB,
+    ADC_DIGI_CLK_SRC_APB = SOC_MOD_CLK_APB,     /*!< Select APB as the source clock */
+    ADC_DIGI_CLK_SRC_DEFAULT = SOC_MOD_CLK_APB, /*!< Select APB as the default clock choice */
 } soc_periph_adc_digi_clk_src_t;
 
 #ifdef __cplusplus

components/soc/esp32c3/include/soc/soc_caps.h

@@ -85,6 +85,7 @@
 #define SOC_ADC_ATTEN_NUM                       (4)
 
 /*!< Digital */
+#define SOC_ADC_DIGI_SEGMENTED_THRESH           1
 #define SOC_ADC_DIGI_CONTROLLER_NUM             (1U)
 #define SOC_ADC_PATT_LEN_MAX                    (8) /*!< One pattern table, each contains 8 items. Each item takes 1 byte */
 #define SOC_ADC_DIGI_MIN_BITWIDTH               (12)