drivers: flash_stm32_xspi: fix DT accessor for flash size

The flash size is the second part (size) of the first reg value, not the
first part (address) of a nonexistent second reg value.

Based-on-patch-by: Armin Brauns <[email protected]>
Signed-off-by: Tim Pambor <[email protected]>

Author: tpambor

drivers/flash/flash_stm32_xspi.c

@@ -2413,7 +2413,7 @@ 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_ADDR_BY_IDX(0, 1),
+	.flash_size = DT_INST_REG_SIZE(0),
 	.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 */

dts/arm/st/h5/stm32h562.dtsi

@@ -266,7 +266,7 @@
 			clocks = <&rcc STM32_CLOCK(AHB4, 20U)>,
 				<&rcc STM32_SRC_PLL1_Q OCTOSPI1_SEL(1)>;
 			#address-cells = <1>;
-			#size-cells = <0>;
+			#size-cells = <1>;
 			status = "disabled";
 		};
 

dts/arm/st/n6/stm32n6.dtsi

@@ -694,7 +694,7 @@
 				 <&rcc STM32_SRC_CKPER XSPI1_SEL(1)>,
 				 <&rcc STM32_CLOCK(AHB5, 13)>;
 			#address-cells = <1>;
-			#size-cells = <0>;
+			#size-cells = <1>;
 			status = "disabled";
 		};
 
@@ -707,7 +707,7 @@
 				 <&rcc STM32_SRC_CKPER XSPI2_SEL(1)>,
 				 <&rcc STM32_CLOCK(AHB5, 13)>;
 			#address-cells = <1>;
-			#size-cells = <0>;
+			#size-cells = <1>;
 			status = "disabled";
 		};
 	};