Add STM32N6 support

boards/st/nucleo_n657x0_q/Kconfig.nucleo_n657x0_q

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+# STM32N657X0_Q Nucleo board configuration
+
+# Copyright (c) 2024 STMicroelectronics
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_NUCLEO_N657X0_Q
+	select SOC_STM32N657XX

boards/st/nucleo_n657x0_q/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2024 STMicroelectronics
+
+board_runner_args(stm32cubeprogrammer "--port=swd")
+board_runner_args(stm32cubeprogrammer "--tool-opt= mode=HOTPLUG ap=1")
+board_runner_args(stm32cubeprogrammer "--extload=MX25UM51245G_STM32N6570-NUCLEO.stldr")
+board_runner_args(stm32cubeprogrammer "--download-address=0x70000000")
+
+include(${ZEPHYR_BASE}/boards/common/stm32cubeprogrammer.board.cmake)

boards/st/nucleo_n657x0_q/board.yml

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+board:
+  name: nucleo_n657x0_q
+  full_name: Nucleo N657x0-Q
+  vendor: st
+  socs:
+    - name: stm32n657xx

boards/st/nucleo_n657x0_q/doc/index.rst

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+.. zephyr:board:: nucleo_n657x0_q
+
+Overview
+********
+
+The STM32 Nucleo-144 board provides an affordable and flexible way for users to try out
+new concepts and build prototypes by choosing from the various combinations of performance
+and power consumption features, provided by the STM32 microcontroller. For the compatible boards,
+the internal or external SMPS significantly reduces power consumption in Run mode.
+
+The ST Zio connector, which extends the ARDUINO® Uno V3 connectivity, and the ST morpho headers
+provide an easy means of expanding the functionality of the Nucleo open development platform with
+a wide choice of specialized shields.
+
+The STM32 Nucleo-144 board does not require any separate probe as it integrates the ST-LINK
+debugger/programmer.
+
+The STM32 Nucleo-144 board comes with the STM32 comprehensive free software libraries and
+examples available with the STM32Cube MCU Package.
+
+Hardware
+********
+
+- Common features:
+
+  - STM32 microcontroller in an LQFP144, TFBGA225, or VFBGA264 package
+  - 3 user LEDs
+  - 1 user push-button and 1 reset push-button
+  - 32.768 kHz crystal oscillator
+  - Board connectors:
+
+    - SWD
+    - ST morpho expansion connector
+
+  - Flexible power-supply options: ST-LINK USB VBUS, USB connector, or external sources
+
+- Features specific to some of the boards (refer to the ordering information section
+  of the data brief for details);
+
+  - External or internal SMPS to generate Vcore logic supply
+  - Ethernet compliant with IEEE-802.3-2002
+  - USB Device only, USB OTG full speed, or SNK/UFP (full-speed or high-speed mode)
+  - Board connectors:
+
+    - ARDUINO® Uno V3 connector or ST Zio expansion connector including ARDUINO® Uno V3
+    - Camera module FPC
+    - MIPI20 compatible connector with trace signals
+    - USB with Micro-AB or USB Type-C®
+    - Ethernet RJ45
+
+  - On-board ST-LINK (STLINK/V2-1, STLINK-V3E, or STLINK-V3EC) debugger/programmer with
+    USB re-enumeration capability: mass storage, Virtual COM port, and debug port
+
+Supported Features
+==================
+
+The Zephyr ``nucleo_n657x0_q`` board supports the following hardware features:
+
++-----------+------------+-------------------------------------+
+| Interface | Controller | Driver/Component                    |
++===========+============+=====================================+
+| CLOCK     | on-chip    | reset and clock control             |
++-----------+------------+-------------------------------------+
+| GPIO      | on-chip    | gpio                                |
++-----------+------------+-------------------------------------+
+| NVIC      | on-chip    | nested vector interrupt controller  |
++-----------+------------+-------------------------------------+
+| UART      | on-chip    | serial port-polling;                |
+|           |            | serial port-interrupt               |
++-----------+------------+-------------------------------------+
+
+
+Other hardware features are not yet supported on this Zephyr port.
+
+The default configuration can be found in the defconfig file:
+:zephyr_file:`boards/st/nucleo_n657x0_q/nucleo_n657x0_q_defconfig`
+
+
+Connections and IOs
+===================
+
+NUCLEO_N657X0_Q Board has 12 GPIO controllers. These controllers are responsible
+for pin muxing, input/output, pull-up, etc.
+
+For more details please refer to `NUCLEO_N657X0_Q User Manual`_.
+
+Default Zephyr Peripheral Mapping:
+----------------------------------
+
+- LD1 : PO1
+- LD2 : PG10
+- USART_1_TX : PE5
+- USART_1_RX : PE6
+
+System Clock
+------------
+
+NUCLEO_N657X0_Q System Clock could be driven by internal or external oscillator,
+as well as main PLL clock. By default System clock is driven by PLL clock at
+400MHz, driven by 64MHz high speed internal oscillator.
+
+Serial Port
+-----------
+
+NUCLEO_N657X0_Q board has 10 U(S)ARTs. The Zephyr console output is assigned to
+USART1. Default settings are 115200 8N1.
+
+Programming and Debugging
+*************************
+
+NUCLEO_N657X0_Q board includes an ST-LINK/V3 embedded debug tool interface.
+This probe allows to flash the board using various tools.
+
+Flashing
+========
+
+The board is configured to be flashed using west `STM32CubeProgrammer`_ runner,
+so its :ref:`installation <stm32cubeprog-flash-host-tools>` is required.
+Version 2.18.0 or later of `STM32CubeProgrammer`_ is required.
+
+Flashing an application to NUCLEO_N657X0_Q
+------------------------------------------
+
+Connect the NUCLEO_N657X0_Q to your host computer using the USB port.
+Then build and flash an application.
+
+.. note::
+   For flashing, BOOT0 pin should be set to 0 and BOOT1 to 1 before powering on
+   the board.
+
+   To run the application after flashing, BOOT1 should be set to 0 and the board
+   should be powered off and on again.
+
+Here is an example for the :zephyr:code-sample:`hello_world` application.
+
+Run a serial host program to connect with your Nucleo board:
+
+.. code-block:: console
+
+   $ minicom -D /dev/ttyACM0
+
+Then build and flash the application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: nucleo_n657x0_q
+   :goals: build flash
+
+You should see the following message on the console:
+
+.. code-block:: console
+
+   Hello World! nucleo_n657x0_q/stm32n657xx
+
+Debugging
+=========
+
+For now debugging is only available through STM32CubeIDE:
+* Go to File > Import and select C/C++ > STM32 Cortex-M Executable
+* In Executable field, browse to your <ZEPHYR_PATH>/build/zephyr/zephyr.elf
+* In MCU field, select STM32N657X0HxQ.
+* Click on Finish
+* Then click on Debug to start the debugging session
+
+.. note::
+   For debugging, BOOT0 pin should be set to 0 and BOOT1 to 1 before powering on the
+   board.
+
+.. _NUCLEO_N657X0_Q website:
+   https://www.st.com/en/evaluation-tools/nucleo-n657x0-q.html
+
+.. _NUCLEO_N657X0_Q User Manual:
+   https://www.st.com/resource/en/user_manual/um3417-stm32n6-nucleo144-board-mb1940-stmicroelectronics.pdf
+
+.. _STM32N657X0 on www.st.com:
+   https://www.st.com/en/microcontrollers-microprocessors/stm32n657x0.html
+
+.. _STM32N657 reference manual:
+   https://www.st.com/resource/en/reference_manual/rm0486-stm32n647657xx-armbased-32bit-mcus-stmicroelectronics.pdf
+
+.. _STM32CubeProgrammer:
+   https://www.st.com/en/development-tools/stm32cubeprog.html

boards/st/nucleo_n657x0_q/nucleo_n657x0_q.dts

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+/*
+ * Copyright (c) 2024 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <st/n6/stm32n657X0.dtsi>
+#include <st/n6/stm32n657x0hxq-pinctrl.dtsi>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	model = "STMicroelectronics STM32N657X0-Q-NUCLEO board";
+	compatible = "st,stm32n657x0-q-nucleo";
+
+	chosen {
+		zephyr,console = &usart1;
+		zephyr,shell-uart = &usart1;
+		zephyr,sram = &axisram2;
+	};
+
+	leds: leds {
+		compatible = "gpio-leds";
+
+		green_led: led_1 {
+			gpios = <&gpiog 0 GPIO_ACTIVE_HIGH>;
+			label = "User LD6";
+		};
+
+		blue_led: led_2 {
+			gpios = <&gpiog 8 GPIO_ACTIVE_HIGH>;
+			label = "User LD7";
+		};
+
+		red_led: led_3 {
+			gpios = <&gpiog 10 GPIO_ACTIVE_HIGH>;
+			label = "User LD5";
+		};
+	};
+
+	gpio_keys {
+		compatible = "gpio-keys";
+
+		user_button: button_0 {
+			gpios = <&gpioc 13 GPIO_ACTIVE_HIGH>;
+			label = "User SB1";
+			zephyr,code = <INPUT_KEY_0>;
+		};
+	};
+
+	aliases {
+		led0 = &green_led;
+		sw0 = &user_button;
+	};
+};
+
+&clk_hsi {
+	hsi-div = <1>;
+	status = "okay";
+};
+
+&pll1 {
+	clocks = <&clk_hsi>;
+	div-m = <4>;
+	mul-n = <75>;
+	div-p1 = <1>;
+	div-p2 = <1>;
+	status = "okay";
+};
+
+&ic1 {
+	pll-src = <1>;
+	ic-div = <2>;
+	status = "okay";
+};
+
+&ic2 {
+	pll-src = <1>;
+	ic-div = <3>;
+	status = "okay";
+};
+
+&ic6 {
+	pll-src = <1>;
+	ic-div = <2>;
+	status = "okay";
+};
+
+&ic11 {
+	pll-src = <1>;
+	ic-div = <3>;
+	status = "okay";
+};
+
+&perck {
+	clocks = <&rcc STM32_SRC_HSI PER_SEL(0)>;
+	status = "okay";
+};
+
+&cpusw {
+	clocks = <&rcc STM32_SRC_IC1 CPU_SEL(3)>;
+	clock-frequency = <DT_FREQ_M(600)>;
+	status = "okay";
+};
+
+&rcc {
+	/* ic2, ic6 & ic11 must all be enabled to set ic2 as SYSCLK */
+	clocks = <&ic2>;
+	clock-frequency = <DT_FREQ_M(400)>;
+	ahb-prescaler = <2>;
+	apb1-prescaler = <1>;
+	apb2-prescaler = <1>;
+	apb4-prescaler = <1>;
+	apb5-prescaler = <1>;
+};
+
+&usart1 {
+	clocks = <&rcc STM32_CLOCK(APB2, 4)>,
+		 <&rcc STM32_SRC_CKPER USART1_SEL(1)>;
+	pinctrl-0 = <&usart1_tx_pe5 &usart1_rx_pe6>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};

boards/st/nucleo_n657x0_q/nucleo_n657x0_q.yaml

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+identifier: nucleo_n657x0_q
+name: ST Nucleo N657X0-Q
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+ram: 1024
+flash: 0
+supported:
+  - gpio
+  - uart
+vendor: st

boards/st/nucleo_n657x0_q/nucleo_n657x0_q_defconfig

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+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2024 STMicroelectronics
+
+# Enable UART driver
+CONFIG_SERIAL=y
+
+# Enable GPIO
+CONFIG_GPIO=y
+
+# Console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# No internal Flash
+CONFIG_XIP=n

boards/st/stm32n6570_dk/Kconfig.stm32n6570_dk

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+# Copyright (c) 2024 STMicroelectronics
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_STM32N6570_DK
+	select SOC_STM32N657XX

boards/st/stm32n6570_dk/board.cmake

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+# SPDX-License-Identifier: Apache-2.0
+# Copyright (c) 2024 STMicroelectronics
+
+board_runner_args(stm32cubeprogrammer "--port=swd")
+board_runner_args(stm32cubeprogrammer "--tool-opt= mode=HOTPLUG ap=1")
+board_runner_args(stm32cubeprogrammer "--extload=MX66UW1G45G_STM32N6570-DK.stldr")
+board_runner_args(stm32cubeprogrammer "--download-address=0x70000000")
+
+include(${ZEPHYR_BASE}/boards/common/stm32cubeprogrammer.board.cmake)

boards/st/stm32n6570_dk/board.yml

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+board:
+  name: stm32n6570_dk
+  full_name: STM32N6570-DK
+  vendor: st
+  socs:
+    - name: stm32n657xx