From 3d39644a2c81ca81c045d760fab26837e7b3c70c Mon Sep 17 00:00:00 2001
From: Felipe Neves <ryukokki.felipe@gmail.com>
Date: Fri, 26 Jul 2024 14:59:57 -0300
Subject: [PATCH] boards: witte_technology: linum: add initial support

To the Linum board from Witte Technology based on STM32H753xx.

Signed-off-by: Felipe Neves <ryukokki.felipe@gmail.com>
---
 boards/witte/index.rst                        |  10 +
 boards/witte/linum/Kconfig.defconfig          |  15 +
 boards/witte/linum/Kconfig.linum              |   5 +
 boards/witte/linum/board.cmake                |   9 +
 boards/witte/linum/board.yml                  |   5 +
 .../linum/doc/img/linum-stm32h753bi-top.jpg   | Bin 0 -> 15110 bytes
 boards/witte/linum/doc/index.rst              | 406 ++++++++++++++++++
 boards/witte/linum/linum.dts                  | 392 +++++++++++++++++
 boards/witte/linum/linum.yaml                 |  21 +
 boards/witte/linum/linum_defconfig            |  23 +
 boards/witte/linum/support/openocd.cfg        |  21 +
 dts/bindings/vendor-prefixes.txt              |   1 +
 12 files changed, 908 insertions(+)
 create mode 100644 boards/witte/index.rst
 create mode 100644 boards/witte/linum/Kconfig.defconfig
 create mode 100644 boards/witte/linum/Kconfig.linum
 create mode 100644 boards/witte/linum/board.cmake
 create mode 100644 boards/witte/linum/board.yml
 create mode 100644 boards/witte/linum/doc/img/linum-stm32h753bi-top.jpg
 create mode 100644 boards/witte/linum/doc/index.rst
 create mode 100644 boards/witte/linum/linum.dts
 create mode 100644 boards/witte/linum/linum.yaml
 create mode 100644 boards/witte/linum/linum_defconfig
 create mode 100644 boards/witte/linum/support/openocd.cfg

diff --git a/boards/witte/index.rst b/boards/witte/index.rst
new file mode 100644
index 00000000000..c7c0d910782
--- /dev/null
+++ b/boards/witte/index.rst
@@ -0,0 +1,10 @@
+.. _boards-witte:
+
+Witte
+#####
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   **/*
diff --git a/boards/witte/linum/Kconfig.defconfig b/boards/witte/linum/Kconfig.defconfig
new file mode 100644
index 00000000000..af3bbba6dd4
--- /dev/null
+++ b/boards/witte/linum/Kconfig.defconfig
@@ -0,0 +1,15 @@
+# STM32H753ZI Linum board configuration
+
+# Copyright (c) 2024 Felipe Neves
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_LINUM
+
+if NETWORKING
+
+config NET_L2_ETHERNET
+	default y
+
+endif # NETWORKING
+
+endif # BOARD_LINUM
diff --git a/boards/witte/linum/Kconfig.linum b/boards/witte/linum/Kconfig.linum
new file mode 100644
index 00000000000..447e3e71469
--- /dev/null
+++ b/boards/witte/linum/Kconfig.linum
@@ -0,0 +1,5 @@
+# Copyright (c) 2024 Felipe Neves
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_LINUM
+	select SOC_STM32H753XX
diff --git a/boards/witte/linum/board.cmake b/boards/witte/linum/board.cmake
new file mode 100644
index 00000000000..8b78b0963a6
--- /dev/null
+++ b/boards/witte/linum/board.cmake
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: Apache-2.0
+
+board_runner_args(jlink "--device=STM32H753BI" "--speed=4000")
+board_runner_args(stm32cubeprogrammer "--port=swd" "--reset-mode=hw")
+board_runner_args(openocd --target-handle=_CHIPNAME.cpu0)
+
+include(${ZEPHYR_BASE}/boards/common/openocd.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/jlink.board.cmake)
+include(${ZEPHYR_BASE}/boards/common/stm32cubeprogrammer.board.cmake)
diff --git a/boards/witte/linum/board.yml b/boards/witte/linum/board.yml
new file mode 100644
index 00000000000..e9ae2c0307d
--- /dev/null
+++ b/boards/witte/linum/board.yml
@@ -0,0 +1,5 @@
+board:
+  name: linum
+  vendor: witte
+  socs:
+    - name: stm32h753xx
diff --git a/boards/witte/linum/doc/img/linum-stm32h753bi-top.jpg b/boards/witte/linum/doc/img/linum-stm32h753bi-top.jpg
new file mode 100644
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diff --git a/boards/witte/linum/doc/index.rst b/boards/witte/linum/doc/index.rst
new file mode 100644
index 00000000000..86fbbeafbdd
--- /dev/null
+++ b/boards/witte/linum/doc/index.rst
@@ -0,0 +1,406 @@
+.. _linum:
+
+Witte Technology Linum Board
+############################
+
+Overview
+********
+Linum is a development board released by Witte Tenology in 2023, and it was developed around the
+STM32H753BI microcontroller. The board has 2 expansion connectors used by the LCD display with
+touchscreen and another for access to other peripherals of microcontroller. Also it brings plenty
+of communications interfaces like UART with RS232 and RS485 capabillities, CAN bus compatible to
+FD standard, and networking over Ethernet.
+
+.. image:: img/linum-stm32h753bi-top.jpg
+     :align: center
+     :alt: Linum development board
+
+Hardware
+********
+
+The board features:
+  - 8 to 52V power supply
+  - SWD Pins for use as STLink (Pin header) and TC2030-IDC 6-Pin Tag-Connect Plug-of-Nails™ Connector
+  - Crystal for HS 25MHz
+  - Crystal for RTC 32.768KHz
+  - 1 UART serial for debug
+  - 1 Led RGB
+  - 1 Buzzer without internal oscillator
+  - 1 Mono audio up to 3W
+  - 1 Ethernet 10/100
+  - 1 MicroSD connector supporting 1 or 4-bit bus
+  - 1 USB 2.0 Host/Device
+  - 1 EEPROM memory with 512K bits
+  - 1 External SRAM memory with 8MB
+  - 1 NOR memory with 16MB
+  - 2 On-board RS232 Transceiver with RTS/CTS
+  - 2 On-board RS485 Transceiver
+  - 2 On-board CAN-FD Transceiver
+
+Expansion connector 1 features:
+  - 1 Display RBG 888
+  - 1 Capacitive Touchscreen sensor
+
+Expansion connector 2 features.
+  - 1 SPI
+  - 1 I2C
+  - 1 One Wire
+  - 2 DACs
+  - 6 PWM Channels
+  - 10 ADCs
+
+Supported Features
+==================
+
+The Zephyr Linum board configuration supports the following hardware
+features:
+
++-----------+------------+-------------------------------------+
+| Interface | Controller | Driver/Component                    |
++===========+============+=====================================+
+| NVIC      | on-chip    | nested vector interrupt controller  |
++-----------+------------+-------------------------------------+
+| UART      | on-chip    | serial port                         |
++-----------+------------+-------------------------------------+
+| PINMUX    | on-chip    | pinmux                              |
++-----------+------------+-------------------------------------+
+| GPIO      | on-chip    | gpio                                |
++-----------+------------+-------------------------------------+
+| RTC       | on-chip    | counter                             |
++-----------+------------+-------------------------------------+
+| I2C       | on-chip    | i2c                                 |
++-----------+------------+-------------------------------------+
+| PWM       | on-chip    | pwm                                 |
++-----------+------------+-------------------------------------+
+| ADC       | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
+| RNG       | on-chip    | True Random number generator        |
++-----------+------------+-------------------------------------+
+| ETHERNET  | on-chip    | ethernet                            |
++-----------+------------+-------------------------------------+
+| SPI       | on-chip    | spi                                 |
++-----------+------------+-------------------------------------+
+| USB       | on-chip    | usb_device                          |
++-----------+------------+-------------------------------------+
+| CAN/CANFD | on-chip    | canbus                              |
++-----------+------------+-------------------------------------+
+| LTDC      | on-chip    | LCD Interface                       |
++-----------+------------+-------------------------------------+
+| FMC       | on-chip    | memc (SDRAM)                        |
++-----------+------------+-------------------------------------+
+| SDMMC     | on-chip    | disk access                         |
++-----------+------------+-------------------------------------+
+
+Other hardware features are not yet supported on this Zephyr port.
+
+The default configuration can be found in the defconfig file:
+:zephyr_file:`boards/witte_technology/linum/linum_defconfig`
+
+
+Default Zephyr Peripheral Mapping:
+----------------------------------
+
+
+BOARD-LEDs
+----------
+
+The LINUM-STM32H753BI has 3 software controllable LEDs.
+
+  ======= =====
+  LED RGB PINS
+  ======= =====
+  LED_R   PG2
+  LED_G   PG3
+  LED_B   PB2
+  ======= =====
+
+UART/USART
+----------
+
+The LINUM-STM32H753BI used the USART1 for serial console.
+
+USART1
+------
+
+  ====== =====
+  USART1 PINS
+  ====== =====
+  TX     PB14
+  RX     PB15
+  ====== =====
+
+The LINUM-STM32H753BI board has two on-board RS-232 transceiver connected to USART2 and USART3.
+
+  ====== =====
+  USART2 PINS
+  ====== =====
+  TXD    PD5
+  RXD    PD6
+  CTS    PD3
+  RTS    PD4
+  ====== =====
+
+  ====== =====
+  USART3 PINS
+  ====== =====
+  TXD    PB10
+  RXD    PB11
+  CTS    PD11
+  RTS    PD12
+  ====== =====
+
+The LINUM-STM32H753BI board has two on-board RS-485 transceiver connected to USART4 and USART6.
+
+  ====== =====
+  UART4  PINS
+  ====== =====
+  TXD    PB9
+  RXD    PB8
+  DE     PA15
+  ====== =====
+
+  ====== =====
+  USART6 PINS
+  ====== =====
+  TXD    PC6
+  RXD    PC7
+  DE     PG12
+  ====== =====
+
+SDMMC
+-----
+
+The LINUM-STM32H753BI has one SDCard slot connected as below:
+
+  ========== =====
+  SDMMC1     PINS
+  ========== =====
+  SDMMC_D0   PC8
+  SDMMC_D1   PC9
+  SDMMC_D2   PC10
+  SDMMC_D3   PC11
+  SDMMC_DK   PC12
+  ========== =====
+
+  =============== =====
+  GPIO            PINS
+  =============== =====
+  SDCARD_DETECTED PG7
+  SDCARD_PWR_EN   PD7
+  =============== =====
+
+ETHERNET
+--------
+
+The LINUM-STM32H753BI has a ethernet connection using the transceiver KSZ8081RNACA.
+
+  ============ =====
+  ETH          PINS
+  ============ =====
+  ETH_REF_CLK  PA1
+  ETH_MDIO     PA2
+  ETH_CRS_DV   PA7
+  ETH_MDC      PC1
+  ETH_RXD0     PC4
+  ETH_RXD1     PC5
+  ETH_TX_EN    PG11
+  ETH_TXD0     PG13
+  ETH_TXD1     PG14
+  ETH_CLK      PA8
+  ETH_RESET    PI4
+  ============ =====
+
+CAN-FD
+------
+
+The LINUM-STM32H753BI board has two on-board CAN-FD transceiver connected to FDCAN1 and FDCAN2.
+
+  ====== =====
+  FDCAN1 PINS
+  ====== =====
+  TXD    PH13
+  RXD    PH14
+  STD    PI2
+  ====== =====
+
+  ====== =====
+  FDCAN2 PINS
+  ====== =====
+  TXD    PB13
+  RXD    PB12
+  STD    PE3
+  ====== =====
+
+USB
+---
+
+The LINUM-STM32H753BI has one usb port.
+
+  ========= =====
+  USB       PINS
+  ========= =====
+  USB_VBUS  PA9
+  USB_N     PA11
+  USB_P     PA12
+  USB_EN    PI12
+  USB_FLT   PI13
+  ========= =====
+
+I2C3
+----
+The LINUM-STM32H753BI connects the EEPROM memory and the touchscreen sensor to I2C3.
+
+  ====== =====
+  I2C3   PINS
+  ====== =====
+  SCL    PH7
+  SDA    PH8
+  ====== =====
+
+External SDRAM
+--------------
+The LINUM-STM32H753BI has a external SDRAM with 8Mbytes connected to FMC peripheral.
+
+  =========== =====
+  FMC         PINS
+  =========== =====
+  FMC_A0      PF0
+  FMC_A1      PF1
+  FMC_A2      PF2
+  FMC_A3      PF3
+  FMC_A4      PF4
+  FMC_A5      PF5
+  FMC_A6      PF12
+  FMC_A7      PF13
+  FMC_A8      PF14
+  FMC_A9      PF15
+  FMC_A10     PG0
+  FMC_A11     PG1
+  FMC_BA0     PG4
+  FMC_BA1     PG5
+  FMC_D0      PD14
+  FMC_D1      PD15
+  FMC_D2      PD0
+  FMC_D3      PD1
+  FMC_D4      PE7
+  FMC_D5      PE8
+  FMC_D6      PE9
+  FMC_D7      PE10
+  FMC_D8      PE11
+  FMC_D9      PE12
+  FMC_D10     PE13
+  FMC_D11     PE14
+  FMC_D12     PE15
+  FMC_D13     PD8
+  FMC_D14     PD9
+  FMC_D15     PD10
+  FMC_NBL0    PE0
+  FMC_NBL1    PE1
+  FMC_SDCKE0  PC3
+  FMC_SDCLK   PG8
+  FMC_SDNCAS  PG15
+  FMC_SDNEO   PC2
+  FMC_SDNRAS  PF11
+  FMC_SDNWE   PC0
+  =========== =====
+
+LCD
+---
+The LINUM-STM32H753BI use the LTDC to support one LCD with RGB connection.
+
+  ============= =====
+  LTDC          PINS
+  ============= =====
+  LTDC_B0       PJ12
+  LTDC_B1       PJ13
+  LTDC_B2       PJ14
+  LTDC_B3       PJ15
+  LTDC_B4       PK3
+  LTDC_B5       PK4
+  LTDC_B6       PK5
+  LTDC_B7       PK6
+  LTDC_CLK      PI14
+  LTDC_DE       PK7
+  LTDC_G0       PJ7
+  LTDC_G1       PJ8
+  LTDC_G2       PJ9
+  LTDC_G3       PJ10
+  LTDC_G4       PJ11
+  LTDC_G5       PK0
+  LTDC_G6       PK1
+  LTDC_G7       PK2
+  LTDC_HSYNC    PI10
+  LTDC_R0       PI15
+  LTDC_R1       PJ0
+  LTDC_R2       PJ1
+  LTDC_R3       PJ2
+  LTDC_R4       PJ3
+  LTDC_R5       PJ4
+  LTDC_R6       PJ5
+  LTDC_R7       PJ6
+  LTDC_VSYNC    PI9
+  PWM_BACKLIGHT PH6
+  ============= =====
+
+System Clock
+------------
+
+Linum H753ZI System Clock could be driven by an internal or external
+oscillator, as well as the main PLL clock. By default, the System clock is
+driven by the PLL clock at 480MHz, driven by an 25MHz high-speed external clock.
+
+
+Programming and Debugging
+*************************
+
+Applications for the ``linum`` board configuration can be built and
+flashed in the usual way (see :ref:`build_an_application` and
+:ref:`application_run` for more details).
+
+.. note::
+
+  For debugging or programming Linum you will need to use an external debug
+  debug or flash tool and connect it to the SWD Connnector. JLink or ST-Link
+  probes are examples of out of the box compatible tools.
+
+Flashing
+========
+
+Flashing an application to the Linum board
+-------------------------------------------
+
+Here is an example for the :ref:`hello_world` application.
+
+Run a serial host program to connect with your Nucleo board.
+
+.. code-block:: console
+
+   $ minicom -b 115200 -D /dev/ttyACM0
+
+Build and flash the application:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: linum
+   :goals: build flash
+
+You should see the following message on the console:
+
+.. code-block:: console
+
+   $ Hello World! linum
+
+Debugging
+=========
+
+You can debug an application in the usual way.  Here is an example for the
+:ref:`hello_world` application.
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/hello_world
+   :board: linum
+   :maybe-skip-config:
+   :goals: debug
+
+.. _Witte Linum website:
+   https://wittetech.com/
diff --git a/boards/witte/linum/linum.dts b/boards/witte/linum/linum.dts
new file mode 100644
index 00000000000..d4846f3e1c7
--- /dev/null
+++ b/boards/witte/linum/linum.dts
@@ -0,0 +1,392 @@
+/*
+ * Copyright (c) 2024 Felipe Neves
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+#include <st/h7/stm32h753Xi.dtsi>
+#include <st/h7/stm32h753bitx-pinctrl.dtsi>
+#include <zephyr/dt-bindings/input/input-event-codes.h>
+
+/ {
+	model = "Witte Technology STM32H753ZI Linum board";
+	compatible = "witte,linum";
+
+	chosen {
+		zephyr,console = &usart1;
+		zephyr,shell-uart = &usart1;
+		zephyr,sram = &sram0;
+		zephyr,flash = &flash0;
+		zephyr,dtcm = &dtcm;
+		zephyr,code-partition = &slot0_partition;
+		zephyr,canbus = &fdcan1;
+	};
+
+	sdram1: sdram@c0000000 {
+		compatible = "zephyr,memory-region", "mmio-sram";
+		device_type = "memory";
+		reg = <0xc0000000 DT_SIZE_M(8)>;
+		zephyr,memory-region = "SDRAM1";
+		zephyr,memory-attr = <( DT_MEM_ARM(ATTR_MPU_RAM) )>;
+	};
+
+	leds: leds {
+		compatible = "gpio-leds";
+		green_led: led_0 {
+			gpios = <&gpiog 2 GPIO_ACTIVE_LOW>;
+			label = "User LD1";
+		};
+		red_led: led_1 {
+			gpios = <&gpiob 2 GPIO_ACTIVE_LOW>;
+			label = "User LD2";
+		};
+		blue_led: led_2 {
+			gpios = <&gpiog 3 GPIO_ACTIVE_LOW>;
+			label = "User LD3";
+		};
+
+	};
+
+	aliases {
+		led0 = &green_led;
+		led1 = &blue_led;
+	};
+};
+
+&gpiod {
+	status = "okay";
+
+	/* power the SD card */
+	mcu-sel-gpios {
+		gpio-hog;
+		gpios = <7 GPIO_ACTIVE_HIGH>;
+		output-high;
+	};
+};
+
+&gpioi {
+	status = "okay";
+	/* power the ETH PHY , and FDCAN1 XVCR*/
+	mcu-sel-gpios {
+		gpio-hog;
+		gpios = <2 GPIO_ACTIVE_HIGH>,
+				<4 GPIO_ACTIVE_HIGH>;
+
+		output-high;
+	};
+};
+
+&gpioe {
+	status = "okay";
+
+	/* power FDCAN2 XVCR*/
+	mcu-sel-gpios {
+		gpio-hog;
+		gpios = <2 GPIO_ACTIVE_HIGH>,
+				<4 GPIO_ACTIVE_HIGH>;
+
+		output-high;
+	};
+};
+
+&clk_lsi {
+	status = "okay";
+};
+
+&clk_hsi48 {
+	status = "okay";
+};
+
+&clk_hse {
+	/delete-property/ hse-bypass;
+	clock-frequency = <DT_FREQ_M(25)>;
+	status = "okay";
+};
+
+&pll {
+	div-m = <5>;
+	mul-n = <192>;
+	div-p = <2>;
+	div-q = <4>;
+	div-r = <4>;
+	clocks = <&clk_hse>;
+	status = "okay";
+};
+
+&pll2 {
+	div-m = <2>;
+	mul-n = <48>;
+	div-p = <8>;
+	div-q = <40>;
+	div-r = <3>;
+	clocks = <&clk_hse>;
+	status = "okay";
+};
+
+&rcc {
+	clocks = <&pll>;
+	clock-frequency = <DT_FREQ_M(480)>;
+	d1cpre = <1>;
+	hpre = <2>;
+	d1ppre = <2>;
+	d2ppre1 = <2>;
+	d2ppre2 = <2>;
+	d3ppre = <2>;
+};
+
+&usart1 {
+	pinctrl-0 = <&usart1_tx_pb14 &usart1_rx_pb15>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&usart2 {
+	pinctrl-0 = <&usart2_tx_pd5 &usart2_rx_pd6>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&usart3 {
+	pinctrl-0 = <&usart3_tx_pb10 &usart3_rx_pb11>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&uart4 {
+	pinctrl-0 = <&uart4_tx_pb9 &uart4_rx_pb8>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+&usart6 {
+	pinctrl-0 = <&usart6_tx_pc6 &usart6_rx_pc7>;
+	pinctrl-names = "default";
+	current-speed = <115200>;
+	status = "okay";
+};
+
+zephyr_udc0: &usbotg_fs {
+	pinctrl-0 = <&usb_otg_fs_dm_pa11 &usb_otg_fs_dp_pa12>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&rtc {
+	clocks = <&rcc STM32_CLOCK_BUS_APB4 0x00010000>,
+		 <&rcc STM32_SRC_LSI RTC_SEL(2)>;
+	status = "okay";
+};
+
+&i2c3 {
+	pinctrl-0 = <&i2c3_scl_ph7 &i2c3_sda_ph8>;
+	pinctrl-names = "default";
+	status = "okay";
+	clock-frequency = <I2C_BITRATE_FAST>;
+};
+
+&timers12 {
+	st,prescaler = <10000>;
+	status = "okay";
+
+	pwm12: pwm {
+		status = "okay";
+		pinctrl-0 = <&tim12_ch1_pb14>;
+		pinctrl-names = "default";
+	};
+};
+
+&adc1 {
+	pinctrl-0 = <&adc1_inp15_pa3>;
+	pinctrl-names = "default";
+	st,adc-clock-source = <SYNC>;
+	st,adc-prescaler = <4>;
+	status = "okay";
+};
+
+&rng {
+	status = "okay";
+};
+
+&fdcan1 {
+	clocks = <&rcc STM32_CLOCK_BUS_APB1_2 0x00000100>,
+		 <&rcc STM32_SRC_PLL2_Q FDCAN_SEL(2)>;
+	pinctrl-0 = <&fdcan1_tx_ph13 &fdcan1_rx_ph14>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&fdcan2 {
+	clocks = <&rcc STM32_CLOCK_BUS_APB1_2 0x00000100>,
+		 <&rcc STM32_SRC_PLL2_Q FDCAN_SEL(2)>;
+	pinctrl-0 = <&fdcan2_rx_pb12 &fdcan2_tx_pb13>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&mac {
+	status = "okay";
+	pinctrl-0 = <&eth_rxd0_pc4
+		     &eth_rxd1_pc5
+		     &eth_ref_clk_pa1
+		     &eth_crs_dv_pa7
+		     &eth_tx_en_pg11
+		     &eth_txd0_pg13
+		     &eth_txd1_pg14>;
+	pinctrl-names = "default";
+};
+
+&mdio {
+	status = "okay";
+	pinctrl-0 = <&eth_mdio_pa2 &eth_mdc_pc1>;
+	pinctrl-names = "default";
+
+	ethernet-phy@0 {
+		compatible = "microchip,ksz8081";
+		reg = <0x00>;
+		status = "okay";
+		microchip,interface-type = "rmii-25MHz";
+	};
+};
+
+&spi1 {
+	status = "okay";
+	pinctrl-0 = <&spi1_sck_pa5 &spi1_miso_pa6 &spi1_mosi_pb5>;
+	pinctrl-names = "default";
+	cs-gpios = <&gpiod 14 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
+};
+
+&fmc {
+	pinctrl-0 = <&fmc_nbl0_pe0
+		&fmc_nbl1_pe1 &fmc_sdclk_pg8 &fmc_sdnwe_pc0 &fmc_sdcke0_pc3_c
+		&fmc_sdne0_pc2_c &fmc_sdnras_pf11 &fmc_sdncas_pg15
+		&fmc_a0_pf0 &fmc_a1_pf1 &fmc_a2_pf2 &fmc_a3_pf3 &fmc_a4_pf4
+		&fmc_a5_pf5 &fmc_a6_pf12 &fmc_a7_pf13 &fmc_a8_pf14
+		&fmc_a9_pf15 &fmc_a10_pg0 &fmc_a11_pg1
+		&fmc_a14_pg4 &fmc_a15_pg5 &fmc_d0_pd14 &fmc_d1_pd15
+		&fmc_d2_pd0 &fmc_d3_pd1 &fmc_d4_pe7 &fmc_d5_pe8 &fmc_d6_pe9
+		&fmc_d7_pe10 &fmc_d8_pe11 &fmc_d9_pe12 &fmc_d10_pe13
+		&fmc_d11_pe14 &fmc_d12_pe15 &fmc_d13_pd8 &fmc_d14_pd9
+		&fmc_d15_pd10>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	sdram {
+		status = "okay";
+		power-up-delay = <100>;
+		num-auto-refresh = <8>;
+		mode-register = <0x220>;
+		refresh-rate = <0x603>;
+		bank@1 {
+			reg = <1>;
+			st,sdram-control = <STM32_FMC_SDRAM_NC_8
+				STM32_FMC_SDRAM_NR_12
+				STM32_FMC_SDRAM_MWID_16
+				STM32_FMC_SDRAM_NB_4
+				STM32_FMC_SDRAM_CAS_3
+				STM32_FMC_SDRAM_SDCLK_PERIOD_2
+				STM32_FMC_SDRAM_RBURST_ENABLE
+				STM32_FMC_SDRAM_RPIPE_0>;
+			st,sdram-timing = <2 7 4 7 2 2 2>;
+		};
+	};
+};
+
+&ltdc {
+		pinctrl-0 = <&ltdc_r0_pi15 &ltdc_r1_pj0 &ltdc_r2_pj1 &ltdc_r3_pj2
+		&ltdc_r4_pj3 &ltdc_r5_pj4 &ltdc_r6_pj5 &ltdc_r7_pj6
+		&ltdc_g0_pj7 &ltdc_g1_pj8 &ltdc_g2_pj9 &ltdc_g3_pj10
+		&ltdc_g4_pj11 &ltdc_g5_pk0 &ltdc_g6_pk1 &ltdc_g7_pk2
+		&ltdc_b0_pj12 &ltdc_b1_pj13 &ltdc_b2_pj14 &ltdc_b3_pj15
+		&ltdc_b4_pk3 &ltdc_b5_pk4 &ltdc_b6_pk5 &ltdc_b7_pk6
+		&ltdc_de_pk7 &ltdc_clk_pi14 &ltdc_hsync_pi10 &ltdc_vsync_pi9>;
+	pinctrl-names = "default";
+
+	disp-on-gpios = <&gpiod 7 GPIO_ACTIVE_HIGH>;
+
+	ext-sdram = <&sdram1>;
+	status = "okay";
+
+	clocks = <&rcc STM32_CLOCK_BUS_APB3 0x00000008>,
+		<&rcc STM32_SRC_PLL3_R NO_SEL>;
+
+	width = <480>;
+	height = <272>;
+	pixel-format = <PANEL_PIXEL_FORMAT_RGB_565>;
+	display-timings {
+		compatible = "zephyr,panel-timing";
+		de-active = <1>;
+		pixelclk-active = <0>;
+		hsync-active = <0>;
+		vsync-active = <0>;
+		hsync-len = <1>;
+		vsync-len = <10>;
+		hback-porch = <43>;
+		vback-porch = <12>;
+		hfront-porch = <8>;
+		vfront-porch = <4>;
+	};
+	def-back-color-red = <0xFF>;
+	def-back-color-green = <0xFF>;
+	def-back-color-blue = <0xFF>;
+};
+
+&sdmmc1 {
+	pinctrl-0 = <&sdmmc1_d0_pc8
+		     &sdmmc1_d1_pc9
+		     &sdmmc1_d2_pc10
+		     &sdmmc1_d3_pc11
+		     &sdmmc1_ck_pc12
+		     &sdmmc1_cmd_pd2>;
+	pinctrl-names = "default";
+	cd-gpios = <&gpiog 7 GPIO_ACTIVE_LOW>;
+	status = "okay";
+
+	disk {
+		status = "okay";
+	};
+};
+
+&flash0 {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		/* 128KB for bootloader */
+		boot_partition: partition@0 {
+			label = "mcuboot";
+			reg = <0x00000000 DT_SIZE_K(128)>;
+			read-only;
+		};
+
+		/* storage: 128KB for settings */
+		storage_partition: partition@20000 {
+			label = "storage";
+			reg = <0x00020000 DT_SIZE_K(128)>;
+		};
+
+		/* application image slot: 256KB */
+		slot0_partition: partition@40000 {
+			label = "image-0";
+			reg = <0x00040000 DT_SIZE_K(256)>;
+		};
+
+		/* backup slot: 256KB */
+		slot1_partition: partition@80000 {
+			label = "image-1";
+			reg = <0x00080000 DT_SIZE_K(256)>;
+		};
+
+		/* swap slot: 128KB */
+		scratch_partition: partition@c0000 {
+			label = "image-scratch";
+			reg = <0x000c0000 DT_SIZE_K(128)>;
+		};
+
+	};
+};
diff --git a/boards/witte/linum/linum.yaml b/boards/witte/linum/linum.yaml
new file mode 100644
index 00000000000..3242d570583
--- /dev/null
+++ b/boards/witte/linum/linum.yaml
@@ -0,0 +1,21 @@
+identifier: linum
+name: Linum
+type: mcu
+arch: arm
+toolchain:
+  - zephyr
+  - gnuarmemb
+  - xtools
+ram: 512
+flash: 2048
+supported:
+  - uart
+  - gpio
+  - counter
+  - i2c
+  - pwm
+  - netif:eth
+  - spi
+  - usb_device
+  - can
+vendor: witte
diff --git a/boards/witte/linum/linum_defconfig b/boards/witte/linum/linum_defconfig
new file mode 100644
index 00000000000..8dcaab60f61
--- /dev/null
+++ b/boards/witte/linum/linum_defconfig
@@ -0,0 +1,23 @@
+# SPDX-License-Identifier: Apache-2.0
+
+# Enable MPU
+CONFIG_ARM_MPU=y
+
+# Enable HW stack protection
+CONFIG_HW_STACK_PROTECTION=y
+
+# Enable UART
+CONFIG_SERIAL=y
+
+# Console
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y
+
+# Enable GPIO
+CONFIG_GPIO=y
+
+# Enable clocks
+CONFIG_CLOCK_CONTROL=y
+
+# enable pin controller
+CONFIG_PINCTRL=y
diff --git a/boards/witte/linum/support/openocd.cfg b/boards/witte/linum/support/openocd.cfg
new file mode 100644
index 00000000000..89d4f7ab594
--- /dev/null
+++ b/boards/witte/linum/support/openocd.cfg
@@ -0,0 +1,21 @@
+source [find board/st_nucleo_h743zi.cfg]
+
+reset_config srst_only srst_nogate connect_assert_srst
+
+$_CHIPNAME.cpu0 configure -event gdb-attach {
+        echo "Debugger attaching: halting execution"
+        gdb_breakpoint_override hard
+}
+
+$_CHIPNAME.cpu0 configure -event gdb-detach {
+        echo "Debugger detaching: resuming execution"
+        resume
+}
+
+# Due to the use of connect_assert_srst, running gdb requires
+# to reset halt just after openocd init.
+rename init old_init
+proc init {} {
+        old_init
+       reset halt
+}
diff --git a/dts/bindings/vendor-prefixes.txt b/dts/bindings/vendor-prefixes.txt
index 27edef9862d..b243c8e6116 100644
--- a/dts/bindings/vendor-prefixes.txt
+++ b/dts/bindings/vendor-prefixes.txt
@@ -732,6 +732,7 @@ winbond	Winbond Electronics corp.
 winsen	Zhengzhou Winsen Electronics Technology Co., Ltd.
 winstar	Winstar Display Corp.
 wits	Shenzhen Merrii Technology Co., Ltd. (WITS)
+witte	Witte Technology
 wiznet	WIZnet Co., Ltd.
 wlf	Wolfson Microelectronics
 wm	Wondermedia Technologies, Inc.