drivers: display: stm32_ltdc: add support of clock_configure

Add support of clock_configure() for clock source selection
through devicetree.

Signed-off-by: Hugues Fruchet <[email protected]>

Author: hfruchet-st

drivers/display/display_stm32_ltdc.c

@@ -76,7 +76,8 @@ struct display_stm32_ltdc_config {
 	uint32_t height;
 	struct gpio_dt_spec disp_on_gpio;
 	struct gpio_dt_spec bl_ctrl_gpio;
-	struct stm32_pclken pclken;
+	const struct stm32_pclken *pclken;
+	size_t pclk_len;
 	const struct reset_dt_spec reset;
 	const struct pinctrl_dev_config *pctrl;
 	void (*irq_config_func)(const struct device *dev);
@@ -297,6 +298,14 @@ static int stm32_ltdc_display_blanking_on(const struct device *dev)
 	return display_blanking_on(display_dev);
 }
 
+/* This symbol takes the value 1 if one of the device instances */
+/* is configured in dts with a domain clock */
+#if STM32_DT_INST_DEV_DOMAIN_CLOCK_SUPPORT
+#define STM32_LTDC_DOMAIN_CLOCK_SUPPORT 1
+#else
+#define STM32_LTDC_DOMAIN_CLOCK_SUPPORT 0
+#endif
+
 static int stm32_ltdc_init(const struct device *dev)
 {
 	int err;
@@ -337,12 +346,23 @@ static int stm32_ltdc_init(const struct device *dev)
 
 	/* Turn on LTDC peripheral clock */
 	err = clock_control_on(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
-				(clock_control_subsys_t) &config->pclken);
+				(clock_control_subsys_t) &config->pclken[0]);
 	if (err < 0) {
 		LOG_ERR("Could not enable LTDC peripheral clock");
 		return err;
 	}
 
+	if (IS_ENABLED(STM32_LTDC_DOMAIN_CLOCK_SUPPORT) && (config->pclk_len > 1)) {
+		/* Enable LTDC clock source */
+		err = clock_control_configure(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
+					      (clock_control_subsys_t) &config->pclken[1],
+					      NULL);
+		if (err < 0) {
+			LOG_ERR("Could not configure LTDC peripheral clock");
+			return err;
+		}
+	}
+
 #if defined(CONFIG_SOC_SERIES_STM32F4X)
 	LL_RCC_PLLSAI_Disable();
 	LL_RCC_PLLSAI_ConfigDomain_LTDC(LL_RCC_PLLSOURCE_HSE,
@@ -455,7 +475,7 @@ static int stm32_ltdc_suspend(const struct device *dev)
 
 	/* Turn off LTDC peripheral clock */
 	err = clock_control_off(DEVICE_DT_GET(STM32_CLOCK_CONTROL_NODE),
-				(clock_control_subsys_t) &config->pclken);
+				(clock_control_subsys_t) &config->pclken[0]);
 
 	return err;
 }
@@ -634,6 +654,9 @@ static DEVICE_API(display, stm32_ltdc_display_api) = {
 			},									\
 		},										\
 	};											\
+	static const struct stm32_pclken pclken_##inst[] =			\
+					 STM32_DT_INST_CLOCKS(inst);		\
+										\
 	static const struct display_stm32_ltdc_config stm32_ltdc_config_##inst = {		\
 		.width = DT_INST_PROP(inst, width),						\
 		.height = DT_INST_PROP(inst, height),						\
@@ -642,10 +665,8 @@ static DEVICE_API(display, stm32_ltdc_display_api) = {
 		.bl_ctrl_gpio = COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, bl_ctrl_gpios),		\
 				(GPIO_DT_SPEC_INST_GET(inst, bl_ctrl_gpios)), ({ 0 })),		\
 		.reset = RESET_DT_SPEC_INST_GET(0),						\
-		.pclken = {									\
-			.enr = DT_INST_CLOCKS_CELL(inst, bits),					\
-			.bus = DT_INST_CLOCKS_CELL(inst, bus)					\
-		},										\
+		.pclken = pclken_##inst,					\
+		.pclk_len = DT_INST_NUM_CLOCKS(inst),				\
 		.pctrl = STM32_LTDC_DEVICE_PINCTRL_GET(inst),					\
 		.irq_config_func = stm32_ltdc_irq_config_func_##inst,				\
 		.display_controller = DEVICE_DT_GET_OR_NULL(					\