soc: ambiq: move init code from SYS_INIT to hooks

Replace SYS_INIT with SoC hooks and adapt SoC init code

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

soc/ambiq/apollo3x/Kconfig

@@ -11,3 +11,4 @@ config SOC_SERIES_APOLLO3X
 	select HAS_SWO
 	select AMBIQ_HAL
 	select HAS_PM
+	select SOC_EARLY_INIT_HOOK

soc/ambiq/apollo3x/power.c

@@ -65,7 +65,7 @@ void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
 	irq_unlock(0);
 }
 
-static int ambiq_power_init(void)
+void ambiq_power_init(void)
 {
 	/* Enable flash.
 	 * Currently all flash area is powered on, but we should only enable the used flash area and
@@ -100,8 +100,4 @@ static int ambiq_power_init(void)
 	 */
 	am_hal_sysctrl_control(AM_HAL_SYSCTRL_CONTROL_DEEPSLEEP_MINPWR_EN, 0);
 #endif
-
-	return 0;
 }
-
-SYS_INIT(ambiq_power_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);

soc/ambiq/apollo3x/soc.c

@@ -8,7 +8,9 @@
 
 #include <am_mcu_apollo.h>
 
-static int arm_apollo3_init(void)
+extern void ambiq_power_init(void);
+
+void soc_early_init_hook(void)
 {
 	/* Set the clock frequency. */
 	am_hal_clkgen_control(AM_HAL_CLKGEN_CONTROL_SYSCLK_MAX, 0);
@@ -23,7 +25,7 @@ static int arm_apollo3_init(void)
 	/* Disable the RTC. */
 	am_hal_rtc_osc_disable();
 
-	return 0;
+#ifdef CONFIG_PM
+	ambiq_power_init();
+#endif
 }
-
-SYS_INIT(arm_apollo3_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);

soc/ambiq/apollo4x/Kconfig

@@ -12,3 +12,4 @@ config SOC_SERIES_APOLLO4X
 	select HAS_SWO
 	select AMBIQ_HAL
 	select HAS_PM
+	select SOC_EARLY_INIT_HOOK

soc/ambiq/apollo4x/power.c

@@ -65,7 +65,7 @@ void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
 	irq_unlock(0);
 }
 
-static int ambiq_power_init(void)
+void ambiq_power_init(void)
 {
 	am_hal_pwrctrl_mcu_memory_config_t sMcuMemCfg = {
 		.eCacheCfg    = AM_HAL_PWRCTRL_CACHE_NONE,
@@ -98,8 +98,4 @@ static int ambiq_power_init(void)
 	am_hal_pwrctrl_dsp_memory_config(AM_HAL_DSP0, &sDSPMemCfg);
 
 	am_hal_pwrctrl_periph_disable(AM_HAL_PWRCTRL_PERIPH_CRYPTO);
-
-	return 0;
 }
-
-SYS_INIT(ambiq_power_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);

soc/ambiq/apollo4x/soc.c

@@ -8,7 +8,8 @@
 
 #include <am_mcu_apollo.h>
 
-static int arm_apollo4_init(void)
+extern void ambiq_power_init(void);
+void soc_early_init_hook(void)
 {
 
 	/* Initialize for low power in the power control block */
@@ -19,8 +20,7 @@ static int arm_apollo4_init(void)
 
 	/* Disable the RTC. */
 	am_hal_rtc_osc_disable();
-
+#ifdef CONFIG_PM
-	return 0;
+	ambiq_power_init();
+#endif
 }
-
-SYS_INIT(arm_apollo4_init, PRE_KERNEL_1, CONFIG_KERNEL_INIT_PRIORITY_DEFAULT);