boards: starfive: add visionfive2 board

these list of patches add support the Starfive Visionfive2
SBC based on the JH7110 SoC. Board identifier is `visionfive2`.

Signed-off-by: Kanak Shilledar <kanakshilledar111@protonmail.com>
Signed-off-by: Pratik Farkase <pratik.farkase@wsisweden.com>

boards/starfive/index.rst

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+.. _boards-starfive:
+
+StarFive
+########
+
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   **/*

boards/starfive/visionfive2/Kconfig.defconfig

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+# Copyright (c) 2024 Kanak Shilledar <kanakshilledar111@protonmail.com>
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_VISIONFIVE2_JH7110
+
+config SYS_CLOCK_TICKS_PER_SEC
+	default 1000
+
+config SYS_CLOCK_HW_CYCLES_PER_SEC
+	default 1000000
+
+endif # BOARD_VISIONFIVE2_JH7110

boards/starfive/visionfive2/Kconfig.visionfive2

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+# Copyright (c) 2024 Kanak Shilledar <kanakshilledar111@protonmail.com>
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_VISIONFIVE2_JH7110
+	select SOC_JH7110

boards/starfive/visionfive2/board.yml

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+# Copyright (c) 2024 Kanak Shilledar <kanakshilledar111@protonmail.com>
+# SPDX-License-Identifier: Apache-2.0
+
+board:
+  name: visionfive2
+  vendor: starfive
+  socs:
+    - name: jh7110

boards/starfive/visionfive2/doc/index.rst

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+.. _visionfive2:
+
+Starfive VisionFive 2 JH7110
+############################
+
+Overview
+********
+
+The StarFive VisionFive 2 is a development board with a StarFive JH7110
+multi-core 64bit RISC-V SoC.
+
+.. image:: img/visionfive2.webp
+   :align: center
+   :alt: StarFive VisionFive 2 Board
+
+Programming and debugging
+*************************
+
+Building
+========
+
+Applications for the ``visionfive2`` board configuration can be built
+as usual (see :ref:`build_an_application`) using the corresponding board name:
+
+.. zephyr-app-commands::
+   :board: visionfive2
+   :goals: build
+
+`spl_tool <https://github.com/starfive-tech/Tools/tree/master/spl_tool/>`_
+is a jh7110 signature tool used to generate spl header information
+and generate ``zephyr.bin.normal.out``.
+
+.. code-block:: console
+
+   ./spl_tool -c -f build/zephyr/zephyr.bin
+
+This will create a new file ``build/zephyr/zephyr.bin.normal.out`` that can be flashed.
+This step is necessary as zephyr binary must contain the SPL header info in order
+to run it in M-Mode (Machine Mode) since S-Mode (Supervisor Mode) is
+currently not supported.
+
+Flashing
+========
+
+.. note::
+   The following steps use minicom for serial communication, feel free to use
+   any other serial terminal that supports xmodem based file transfers.
+   Thanks to @orangecms for his vf2-loader tool which makes the flashing process easier
+
+git clone the vf2-loader tool from https://github.com/orangecms/vf2-loader.git and
+xmodem tool from https://github.com/orangecms/xmodem.rs.git side by side.
+
+VisionFive2 uses uart for flashing. Refer to
+`VisionFive2 Recovery Quick Start Guide
+<https://doc-en.rvspace.org/VisionFive2/Quick_Start_Guide/VisionFive2_SDK_QSG/recovering_bootloader%20-%20vf2.html>`_
+to connect your serial-to-usb converter. Now power on the board and using
+minicom access board's serial and press the reset switch on the board until you see CCCCCC... prompt
+
+Copy the ``zephyr.bin.normal.out`` from ``build/zephyr/zephyr.bin.normal.out``
+to previously git cloned vf2-loader/ directory and cd into it.
+Flash the ``zephyr.bin.normal.out`` using this command:
+
+.. code-block:: console
+
+   cargo run -- zephyr.bin.normal.out && minicom -D /dev/ttyUSB0
+
+.. code-block:: text
+
+   cargo run -- zephyr.bin.normal.out && minicom -D /dev/ttyUSB0
+   Finished dev [unoptimized + debuginfo] target(s) in 0.03s
+   Running `target/debug/vf2-loader zephyr.bin.normal.out`
+   Welcome to minicom 2.7.1
+   OPTIONS: I18n
+   Compiled on Dec 23 2019, 02:06:26.
+   Port /dev/ttyUSB0, 14:59:24
+   Press CTRL-A Z for help on special keys
+   6*** Booting Zephyr OS build v3.6.0-rc3 ***
+   Hello World! visionfive2

boards/starfive/visionfive2/visionfive2.dts

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+/*
+ * Copyright (c) 2024 Kanak Shilledar <kanakshilledar111@protonmail.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/dts-v1/;
+
+#include "starfive/jh7110-visionfive-v2.dtsi"
+
+/ {
+	model = "StarFive VisionFive V2";
+	compatible = "starfive,visionfive-v2";
+
+	chosen {
+		zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
+		zephyr,sram = &ram0;
+	};
+};
+
+&uart0 {
+	status = "okay";
+	current-speed = <115200>;
+};
+
+&uart1 {
+	status = "okay";
+	current-speed = <115200>;
+};

boards/starfive/visionfive2/visionfive2.yaml

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+identifier: visionfive2
+name: Visionfive JH7110 (NON-SMP)
+type: mcu
+arch: riscv64
+toolchain:
+  - zephyr
+  - cross-compile
+supported:
+  - uart

boards/starfive/visionfive2/visionfive2_defconfig

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+# SPDX-License-Identifier: Apache-2.0
+
+# Zephyr Kernel Configuration
+CONFIG_PRINTK=y
+CONFIG_XIP=n
+
+# Serial Drivers
+CONFIG_SERIAL=y
+CONFIG_CONSOLE=y
+CONFIG_UART_CONSOLE=y