drivers: clock control of the stm32h7 skips pll1 re-init

Skip the PLL1 init if it is already running, this will avoid disabling
the PLL when running after a jump from mcuboot.
In case of XiP, the pll must not be reinit because it clocks
the octo-quad SPI instance which accesses the external NOR flash.

Signed-off-by: Francois Ramu <[email protected]>

Author: FRASTM

drivers/clock_control/clock_stm32_ll_h7.c

@@ -672,6 +672,16 @@ __unused
 static int set_up_plls(void)
 {
 #if defined(STM32_PLL_ENABLED) || defined(STM32_PLL2_ENABLED) || defined(STM32_PLL3_ENABLED)
+
+	/*
+	 * Skip if PLL1 is already configured by the McuBoot
+	 * with ext NOR in MemMapped  : application running in external NOR in XiP
+	 * has not necessarily the CONFIG_STM32_MEMMAP
+	 */
+	if (LL_RCC_PLL1_IsReady()) {
+		return 0;
+	}
+
 	int r;
 	uint32_t vco_input_range;
 	uint32_t vco_output_range;