drivers: add assert to check for max children in timer

check for max number of children in timer.

Signed-off-by: Richard Wheatley <richard.wheatley@ambiq.com>

Author: RichardSWheatley

drivers/counter/counter_ambiq_timer.c

@@ -438,12 +438,14 @@ static void counter_ambiq_isr(void *arg)
 #endif
 
 #define AMBIQ_COUNTER_INIT(idx)                                                                    \
+	BUILD_ASSERT(DT_CHILD_NUM_STATUS_OKAY(DT_INST_PARENT(idx)) == 1,                           \
+		     "Too many children for Timer!");                                              \
 	static void counter_irq_config_func_##idx(void);                                           \
 	static struct counter_ambiq_data counter_data_##idx;                                       \
 	static const struct counter_ambiq_config counter_config_##idx = {                          \
 		.instance = (DT_REG_ADDR(DT_INST_PARENT(idx)) - SOC_TIMER_BASE) /                  \
 			    DT_REG_SIZE(DT_INST_PARENT(idx)),                                      \
-		.clk_src = DT_ENUM_IDX(DT_INST_PARENT(idx), clk_source),                               \
+		.clk_src = DT_ENUM_IDX(DT_INST_PARENT(idx), clk_source),                           \
 		.counter_info = {.max_top_value = UINT32_MAX,                                      \
 				 .flags = COUNTER_CONFIG_INFO_COUNT_UP,                            \
 				 .channels = 1},                                                   \

drivers/pwm/pwm_ambiq_ctimer.c

@@ -225,6 +225,8 @@ static DEVICE_API(pwm, pwm_ambiq_timer_driver_api) = {
 };
 
 #define PWM_AMBIQ_TIMER_DEVICE_INIT(n)                                                             \
+	BUILD_ASSERT(DT_CHILD_NUM_STATUS_OKAY(DT_INST_PARENT(n)) == 1,                             \
+		     "Too many children for Timer!");                                              \
 	PINCTRL_DT_INST_DEFINE(n);                                                                 \
 	static struct pwm_ambiq_timer_data pwm_ambiq_timer_data_##n = {                            \
 		.cycles = 0,                                                                       \

drivers/pwm/pwm_ambiq_timer.c

@@ -178,6 +178,8 @@ static DEVICE_API(pwm, pwm_ambiq_timer_driver_api) = {
 };
 
 #define PWM_AMBIQ_TIMER_DEVICE_INIT(n)                                                             \
+	BUILD_ASSERT(DT_CHILD_NUM_STATUS_OKAY(DT_INST_PARENT(n)) == 1,                             \
+		     "Too many children for Timer!");                                              \
 	PINCTRL_DT_INST_DEFINE(n);                                                                 \
 	static struct pwm_ambiq_timer_data pwm_ambiq_timer_data_##n = {                            \
 		.cycles = 0,                                                                       \