drivers: flash: stm32 xspi driver size and address of the external NOR

New property of the st,stm32-xspi-nor compatible gives
the external NOR flash in bits.
The property of the st,stm32-xspi compatible gives
the external NOR flash base address

Signed-off-by: Francois Ramu <francois.ramu@st.com>

Author: FRASTM

drivers/flash/flash_stm32_xspi.c

@@ -37,8 +37,8 @@ LOG_MODULE_REGISTER(flash_stm32_xspi, CONFIG_FLASH_LOG_LEVEL);
 		    (_CONCAT(HAL_XSPIM_, DT_STRING_TOKEN(STM32_XSPI_NODE, prop))),	\
 		    ((default_value)))
 
-/* Get the base address of the flash from the DTS node */
-#define STM32_XSPI_BASE_ADDRESS DT_INST_REG_ADDR(0)
+/* Get the base address of the flash from the DTS st,stm32-xspi node */
+#define STM32_XSPI_BASE_ADDRESS DT_REG_ADDR_BY_IDX(STM32_XSPI_NODE, 1)
 
 #define STM32_XSPI_RESET_GPIO DT_INST_NODE_HAS_PROP(0, reset_gpios)
 
@@ -2434,7 +2434,7 @@ static const struct flash_stm32_xspi_config flash_stm32_xspi_cfg = {
 	.pclken = pclken,
 	.pclk_len = DT_NUM_CLOCKS(STM32_XSPI_NODE),
 	.irq_config = flash_stm32_xspi_irq_config_func,
-	.flash_size = DT_INST_REG_SIZE(0),
+	.flash_size = DT_INST_PROP(0, size) / 8, /* In Bytes */
 	.max_frequency = DT_INST_PROP(0, ospi_max_frequency),
 	.data_mode = DT_INST_PROP(0, spi_bus_width), /* SPI or OPI */
 	.data_rate = DT_INST_PROP(0, data_rate), /* DTR or STR */