tests: drivers: clock control stm32 adc device clock setting

Tests the ADC clock domain on the stm32g0 serie
Possible ADC clock sources are SYStem clock (default) or PLL_P.
No clock source HSI for the ADC tested here.

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

tests/drivers/clock_control/stm32_clock_configuration/stm32_common_devices/boards/g0_i2c1_sysclk_lptim1_lsi.overlay

@@ -77,6 +77,6 @@
 };
 
 &adc1 {
-	/* Basic test only. Don't configure domain clock. */
+	/* Basic test only. ADC1 domain clock is set by the board DTS : SYSCLK */
 	status = "okay";
 };

tests/drivers/clock_control/stm32_clock_configuration/stm32_common_devices/src/test_stm32_clock_configuration_adc.c

@@ -25,18 +25,17 @@
 #define PERIPHCLK_ADC		RCC_PERIPHCLK_ADC12
 #define ADC_IS_CLK_ENABLED	__HAL_RCC_ADC12_IS_CLK_ENABLED
 #define GET_ADC_SOURCE		__HAL_RCC_GET_ADC12_SOURCE
-#define ADC_SOURCE_SYSCLK	RCC_ADC12CLKSOURCE_SYSCLK
 #elif defined(__HAL_RCC_GET_ADC_SOURCE)
 #define PERIPHCLK_ADC		RCC_PERIPHCLK_ADC
 #define ADC_IS_CLK_ENABLED	__HAL_RCC_ADC_IS_CLK_ENABLED
 #define GET_ADC_SOURCE		__HAL_RCC_GET_ADC_SOURCE
-#define ADC_SOURCE_SYSCLK	RCC_ADCCLKSOURCE_SYSCLK
 #else
 #define PERIPHCLK_ADC		(-1)
 #define ADC_IS_CLK_ENABLED	__HAL_RCC_ADC1_IS_CLK_ENABLED
 #define GET_ADC_SOURCE()	(-1);
 #endif
 
+/* Not all the stm32 series have all the clock sources */
 #if defined(RCC_ADC12CLKSOURCE_PLL)
 #define ADC_SOURCE_PLL		RCC_ADC12CLKSOURCE_PLL
 #elif defined(RCC_ADCCLKSOURCE_PLLADC)
@@ -47,6 +46,14 @@
 #define ADC_SOURCE_PLL		(-1)
 #endif
 
+#if defined(RCC_ADC12CLKSOURCE_SYSCLK)
+#define ADC_SOURCE_SYSCLK	RCC_ADC12CLKSOURCE_SYSCLK
+#elif defined(RCC_ADCCLKSOURCE_SYSCLK)
+#define ADC_SOURCE_SYSCLK	RCC_ADCCLKSOURCE_SYSCLK
+#else
+#define ADC_SOURCE_SYSCLK	(-1)
+#endif
+
 ZTEST(stm32_common_devices_clocks, test_adc_clk_config)
 {
 	static const struct stm32_pclken pclken[] = STM32_DT_CLOCKS(DT_NODELABEL(adc1));
@@ -87,13 +94,20 @@ ZTEST(stm32_common_devices_clocks, test_adc_clk_config)
 		dev_actual_clk_src = GET_ADC_SOURCE();
 
 		switch (pclken[1].bus) {
+#if defined(STM32_SRC_SYSCLK)
+		case STM32_SRC_SYSCLK:
+			zassert_equal(dev_actual_clk_src, ADC_SOURCE_SYSCLK,
+					"Expected ADC1 src: SYSCLK (0x%lx). Actual ADC1 src: 0x%x",
+					ADC_SOURCE_SYSCLK, dev_actual_clk_src);
+			break;
+#endif /* STM32_SRC_SYSCLK */
 #if defined(STM32_SRC_PLL_P)
 		case STM32_SRC_PLL_P:
 			zassert_equal(dev_actual_clk_src, ADC_SOURCE_PLL,
 					"Expected ADC1 src: PLL (0x%lx). Actual ADC1 src: 0x%x",
 					ADC_SOURCE_PLL, dev_actual_clk_src);
 			break;
-#endif
+#endif /* STM32_SRC_PLL_P */
 		default:
 			zassert_true(0, "Unexpected src clk (%d)", dev_actual_clk_src);
 		}