dts: stm32h7: Remove zephyr,flash-controller support on M4 core

Flash controller support is not yet ready on M4 core.
Remove the chosen declaration to make it clear.

Additionally, generate a build error if this driver is compiled
on M4 core.

Signed-off-by: Erwan Gouriou <[email protected]>

Author: erwango

drivers/flash/flash_stm32h7x.c

@@ -29,6 +29,10 @@ LOG_MODULE_REGISTER(LOG_DOMAIN);
  */
 #define STM32H7_FLASH_TIMEOUT   (2 * STM32H7_FLASH_MAX_ERASE_TIME)
 
+#ifdef CONFIG_CPU_CORTEX_M4
+#error Flash driver on M4 core is not supported yet
+#endif
+
 #if defined(CONFIG_MULTITHREADING)
 /*
  * This is named flash_stm32_sem_take instead of flash_stm32_lock (and

dts/arm/st/h7/stm32h745Xi_m4.dtsi

@@ -10,6 +10,11 @@
 /delete-node/ &flash0;
 
 / {
+	chosen {
+		/* Flash controller support is not yet supported on M4 core */
+		/delete-property/ zephyr,flash-controller;
+	};
+
 	cpus {
 		/delete-node/ cpu@0;
 	};

dts/arm/st/h7/stm32h747Xi_m4.dtsi

@@ -10,6 +10,11 @@
 /delete-node/ &flash0;
 
 / {
+	chosen {
+		/* Flash controller support is not yet supported on M4 core */
+		/delete-property/ zephyr,flash-controller;
+	};
+
 	cpus {
 		/delete-node/ cpu@0;
 	};