drivers: use fracn in clock stm32h7 driver

use fracn value if defined for each PLL 1, 2 and 3 based on stm32u5 code

Signed-off-by: Nathan Olff <[email protected]>

Author: nono313

drivers/clock_control/clock_stm32_ll_h7.c

@@ -800,8 +800,11 @@ static int set_up_plls(void)
 
 	LL_RCC_PLL1_SetN(STM32_PLL_N_MULTIPLIER);
 
-	/* FRACN disable DIVP,DIVQ,DIVR enable*/
 	LL_RCC_PLL1FRACN_Disable();
+	if (IS_ENABLED(STM32_PLL_FRACN_ENABLED)) {
+		LL_RCC_PLL1_SetFRACN(STM32_PLL_FRACN_VALUE);
+		LL_RCC_PLL1FRACN_Enable();
+	}
 
 	if (IS_ENABLED(STM32_PLL_P_ENABLED)) {
 		LL_RCC_PLL1_SetP(STM32_PLL_P_DIVISOR);
@@ -846,6 +849,10 @@ static int set_up_plls(void)
 	LL_RCC_PLL2_SetN(STM32_PLL2_N_MULTIPLIER);
 
 	LL_RCC_PLL2FRACN_Disable();
+	if (IS_ENABLED(STM32_PLL2_FRACN_ENABLED)) {
+		LL_RCC_PLL2_SetFRACN(STM32_PLL2_FRACN_VALUE);
+		LL_RCC_PLL2FRACN_Enable();
+	}
 
 	if (IS_ENABLED(STM32_PLL2_P_ENABLED)) {
 		LL_RCC_PLL2_SetP(STM32_PLL2_P_DIVISOR);
@@ -896,6 +903,10 @@ static int set_up_plls(void)
 	LL_RCC_PLL3_SetN(STM32_PLL3_N_MULTIPLIER);
 
 	LL_RCC_PLL3FRACN_Disable();
+	if (IS_ENABLED(STM32_PLL3_FRACN_ENABLED)) {
+		LL_RCC_PLL3_SetFRACN(STM32_PLL3_FRACN_VALUE);
+		LL_RCC_PLL3FRACN_Enable();
+	}
 
 	if (IS_ENABLED(STM32_PLL3_P_ENABLED)) {
 		LL_RCC_PLL3_SetP(STM32_PLL3_P_DIVISOR);