boards: nxp: frdm_mcxn947 and mcx_n9xx_evk: enable clock for FMU

For internal flash FMU programg/erase operations, enable the FRO12MHZ
clock when the flash driver is enabled.

Signed-off-by: Derek Snell <derek.snell@nxp.com>

Author: DerekSnell

boards/nxp/frdm_mcxn947/board.c

@@ -99,6 +99,11 @@ void board_early_init_hook(void)
 	/* Configure Flash wait-states to support 1.2V voltage level and 150000000Hz frequency */
 	FMU0->FCTRL = (FMU0->FCTRL & ~((uint32_t)FMU_FCTRL_RWSC_MASK)) | (FMU_FCTRL_RWSC(0x3U));
 
+#ifdef CONFIG_FLASH
+	/* Enable clock for internal FMU flash */
+	CLOCK_SetupClockCtrl(SYSCON_CLOCK_CTRL_FRO12MHZ_ENA_MASK);
+#endif
+
 	/* Enable FRO HF(48MHz) output */
 	CLOCK_SetupFROHFClocking(48000000U);
 

boards/nxp/mcx_n9xx_evk/board.c

@@ -99,6 +99,11 @@ void board_early_init_hook(void)
 	/* Configure Flash wait-states to support 1.2V voltage level and 150000000Hz frequency */
 	FMU0->FCTRL = (FMU0->FCTRL & ~((uint32_t)FMU_FCTRL_RWSC_MASK)) | (FMU_FCTRL_RWSC(0x3U));
 
+#ifdef CONFIG_FLASH
+	/* Enable clock for internal FMU flash */
+	CLOCK_SetupClockCtrl(SYSCON_CLOCK_CTRL_FRO12MHZ_ENA_MASK);
+#endif
+
 	/* Enable FRO HF(48MHz) output */
 	CLOCK_SetupFROHFClocking(48000000U);