arm: stm32mp: handle the OP-TEE nodes in DT with FIP support

With FIP support in TF-A (when CONFIG_STM32MP15x_STM32IMAGE
is not activated), the DT nodes needed by OP-TEE are added by OP-TEE
firmware in U-Boot device tree, present in FIP.

These nodes are only required in trusted boot, when TF-A load the file
u-boot.stm32, including the U-Boot device tree with STM32IMAGE header,
in this case OP-TEE can't update the U-Boot device tree.

Moreover in trusted boot mode with FIP, as the OP-TEE nodes are present
in U-Boot device tree only when needed the function
stm32_fdt_disable_optee can be removed.
Signed-off-by: NPatrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: NPatrice Chotard <patrice.chotard@foss.st.com>

arch/arm/dts/stm32mp157a-dk1-u-boot.dtsi

@@ -21,6 +21,8 @@
 		st,stm32prog-gpios = <&gpioa 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
 	};
 
+#ifdef CONFIG_STM32MP15x_STM32IMAGE
+	/* only needed for boot with TF-A, witout FIP support */
 	firmware {
 		optee {
 			compatible = "linaro,optee-tz";
@@ -37,6 +39,7 @@
 			u-boot,dm-spl;
 		};
 	};
+#endif
 
 	led {
 		red {

arch/arm/dts/stm32mp157c-ed1-u-boot.dtsi

@@ -20,6 +20,8 @@
 		st,stm32prog-gpios = <&gpioa 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
 	};
 
+#ifdef CONFIG_STM32MP15x_STM32IMAGE
+	/* only needed for boot with TF-A, witout FIP support */
 	firmware {
 		optee {
 			compatible = "linaro,optee-tz";
@@ -33,6 +35,7 @@
 			no-map;
 		};
 	};
+#endif
 
 	led {
 		red {

arch/arm/mach-stm32mp/fdt.c

@@ -332,7 +332,16 @@ int ft_system_setup(void *blob, struct bd_info *bd)
 				       "st,package", pkg, false);
 	}
 
-	if (!CONFIG_IS_ENABLED(OPTEE) ||
+	/*
+	 * TEMP: remove OP-TEE nodes in kernel device tree
+	 *       copied from U-Boot device tree by optee_copy_fdt_nodes
+	 *       when OP-TEE is not detected (probe failed)
+	 * these OP-TEE nodes are present in <board>-u-boot.dtsi
+	 * under CONFIG_STM32MP15x_STM32IMAGE only for compatibility
+	 * when FIP is not used by TF-A
+	 */
+	if (CONFIG_IS_ENABLED(STM32MP15x_STM32IMAGE) &&
+	    CONFIG_IS_ENABLED(OPTEE) &&
 	    !tee_find_device(NULL, NULL, NULL, NULL))
 		stm32_fdt_disable_optee(blob);