drivers: clock_control: sf32lb: add get_rate support

Add get_rate support for sf32lb platform

Signed-off-by: Qingsong Gou <[email protected]>

Author: ck-telecom

drivers/clock_control/clock_control_sf32lb_rcc.c

@@ -68,6 +68,31 @@ static int clock_control_sf32lb_rcc_off(const struct device *dev, clock_control_
 	return 0;
 }
 
+int clock_control_sf32lb_rcc_get_rate(const struct device *dev, clock_control_subsys_t sys,
+					uint32_t *rate)
+{
+	uint16_t id = *(uint16_t *)sys;
+	int ret = 0;
+
+	switch (id) {
+	case SF32LB52X_CLOCK_I2C1:
+	case SF32LB52X_CLOCK_I2C2:
+	case SF32LB52X_CLOCK_I2C3:
+	case SF32LB52X_CLOCK_I2C4:
+	case SF32LB52X_CLOCK_SPI1:
+	case SF32LB52X_CLOCK_SPI2:
+	case SF32LB52X_CLOCK_USART2:
+	case SF32LB52X_CLOCK_USART3:
+		*rate = DT_FREQ_M(48); /* clk_peri_hpsys always 48MHZ */
+		break;
+
+	default:
+		ret = -ENOTSUP; /* TODO: others are not support yet */
+		break;
+
+	return ret;
+}
+
 static enum clock_control_status clock_control_sf32lb_rcc_get_status(const struct device *dev,
 								     clock_control_subsys_t sys)
 {
@@ -85,6 +110,7 @@ static enum clock_control_status clock_control_sf32lb_rcc_get_status(const struc
 static DEVICE_API(clock_control, clock_control_sf32lb_rcc_api) = {
 	.on = clock_control_sf32lb_rcc_on,
 	.off = clock_control_sf32lb_rcc_off,
+	.get_rate = clock_control_sf32lb_rcc_get_rate,
 	.get_status = clock_control_sf32lb_rcc_get_status,
 };