boards: disco_l475_iot1: Enable support for MX25R6435F QSPI NOR

Configure QSPI NOR support and MX25R6435F on disco_l475_iot1 board.

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

Author: erwango

boards/arm/disco_l475_iot1/disco_l475_iot1.dts

@@ -228,3 +228,27 @@
 		     &adc1_in14_pc5>;
 	status = "okay";
 };
+
+&dma1 {
+	status = "okay";
+};
+
+&quadspi {
+	pinctrl-0 = <&quadspi_clk_pe10 &quadspi_ncs_pe11
+		     &quadspi_bk1_io0_pe12 &quadspi_bk1_io1_pe13
+		     &quadspi_bk1_io2_pe14 &quadspi_bk1_io3_pe15>;
+	dmas = <&dma1 5 5 0x0000 0x03>;
+	dma-names = "tx_rx";
+
+	status = "okay";
+
+	mx25r6435f: qspi-nor-flash@0 {
+		compatible = "st,stm32-qspi-nor";
+		label = "MX25R6435F";
+		reg = <0>;
+		spi-max-frequency = <80000000>;
+		/* 64 Megabits = 8 Megabytes */
+		size = <0x4000000>;
+		status = "okay";
+	};
+};

boards/arm/disco_l475_iot1/doc/index.rst

@@ -125,6 +125,16 @@ The Zephyr Disco L475 IoT board configuration supports the following hardware fe
 +-----------+------------+-------------------------------------+
 | ADC       | on-chip    | adc                                 |
 +-----------+------------+-------------------------------------+
+| QSPI NOR  | on-chip    | flash                               |
++-----------+------------+-------------------------------------+
+
+Note: QSPI NOR Support could be tested using ``samples/drivers/flash_shell``.
+      Once the shell is started, run following command:
+
+.. code-block:: console
+
+   uart:~$ flash set_device MX25R6435F
+
 
 Other hardware features are not yet supported on this Zephyr port.