boards: arm: stm32h747i disco board enables QSPI interface

The stm32h474i_disco has a twin NOR flash made of two
MT25QL512 64MBytes quad-NOR devices.
Here, the partition is fully adressing the memory size.
The 1st NOR device is selected (U3 on the schematics).

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

boards/arm/stm32h747i_disco/doc/index.rst

@@ -27,6 +27,7 @@ Additionally, the board features:
 - USB OTG HS
 - Stereo speaker outputs
 - ST-MEMS digital microphones
+- 2 x 512-Mbit QUAD-SPI NOR Flash memory
 - 256-Mbit SDRAM
 - 4 color user LEDs
 - 1 user and reset push-button
@@ -71,6 +72,8 @@ The current Zephyr stm32h747i_disco board configuration supports the following h
 +-----------+------------+-------------------------------------+
 | SPI       | on-chip    | spi                                 |
 +-----------+------------+-------------------------------------+
+| QSPI NOR  | on-chip    | off-chip flash                      |
++-----------+------------+-------------------------------------+
 | SDMMC     | on-chip    | disk access                         |
 +-----------+------------+-------------------------------------+
 | IPM       | on-chip    | virtual mailbox based on HSEM       |

boards/arm/stm32h747i_disco/stm32h747i_disco_m7.dts

@@ -19,6 +19,7 @@
 		zephyr,shell-uart = &usart1;
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
+		zephyr,flash-controller = &mt25ql512ab1;
 	};
 
 	sdram2: sdram@d0000000 {
@@ -53,6 +54,7 @@
 		led0 = &green_led_1;
 		led1 = &orange_led_2;
 		sw0 = &wake_up;
+		spi-flash0 = &mt25ql512ab1;
 	};
 };
 
@@ -206,4 +208,41 @@ zephyr_udc0: &usbotg_hs {
 	cd-gpios = <&gpioi 8 GPIO_ACTIVE_LOW>;
 };
 
+&quadspi {
+	pinctrl-0 = <&quadspi_clk_pb2 &quadspi_bk1_ncs_pg6
+		     &quadspi_bk1_io0_pd11 &quadspi_bk1_io1_pf9
+		     &quadspi_bk1_io2_pf7 &quadspi_bk1_io3_pf6
+		     &quadspi_bk2_io0_ph2 &quadspi_bk2_io1_ph3
+		     &quadspi_bk2_io2_pg9 &quadspi_bk2_io3_pg14>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	mt25ql512ab1: qspi-nor-flash-1@0 {
+		compatible = "st,stm32-qspi-nor";
+		reg = <0>;
+		qspi-max-frequency = <72000000>;
+		size = <DT_SIZE_M(512)>; /* 64 MBytes */
+		spi-bus-width = <4>;
+		status = "okay";
+
+		partitions {
+			   compatible = "fixed-partitions";
+			   #address-cells = <1>;
+			   #size-cells = <1>;
+
+			   partition@0 {
+			       reg = <0x0 DT_SIZE_M(64)>;
+			   };
+		};
+	};
+
+	mt25ql512ab2: qspi-nor-flash-2@0 {
+		compatible = "st,stm32-qspi-nor";
+		reg = <0>;
+		qspi-max-frequency = <72000000>;
+		size = <DT_SIZE_M(512)>; /* 64 MBytes */
+		status = "okay";
+	};
+};
+
 arduino_spi: &spi5 {};

boards/arm/stm32h747i_disco/stm32h747i_disco_m7.yaml

@@ -14,6 +14,7 @@ supported:
   - arduino_spi
   - spi
   - netif:eth
+  - qspi
   - memc
   - usb_cdc
   - usb_device