docs(gpu): add docs for arm-2d (#3456)

README.md

@@ -100,6 +100,7 @@ Just to mention some platforms:
 - Microchip dsPIC33, PIC24, PIC32MX, PIC32MZ
 - [Linux frame buffer](https://blog.lvgl.io/2018-01-03/linux_fb) (/dev/fb)
 - [Raspberry Pi](https://github.com/lvgl/lv_port_linux_frame_buffer)
+- [Raspberry Pi Pico](https://github.com/lvgl/lv_port_raspberry_pi_pico_mdk)
 - [Espressif ESP32](https://github.com/lvgl/lv_port_esp32)
 - [Infineon Aurix](https://github.com/lvgl/lv_port_aurix)
 - Nordic NRF52 Bluetooth modules
@@ -114,6 +115,7 @@ LVGL is also available as:
 - [NXP MCUXpresso component](https://www.nxp.com/design/software/embedded-software/lvgl-open-source-graphics-library:LITTLEVGL-OPEN-SOURCE-GRAPHICS-LIBRARY)
 - [NuttX library](https://docs.lvgl.io/master/get-started/os/nuttx.html)
 - [RT-Thread RTOS](https://docs.lvgl.io/master/get-started/os/rt-thread.html)
+- CMSIS-Pack
 
 
 ## Get started

docs/CHANGELOG.md

@@ -10,7 +10,7 @@
 - **inherit and initial style properties** Besides setting "normal values" for style properties now you can set them to `inherit` (inherit the parent's value) and `initial` (set the system default). See more [here](https://docs.lvgl.io/master/overview/style.html#forced-value-inheritance-default-value)
 - **NXP-PXP and VGLITE GPU support** The support for NXP GPUs are added again
 - **Color font support** You can use emojis and images in texts with this great new features. See more [here](https://docs.lvgl.io/master/others/imgfont.html).
-- **ARM2D GPU support** Get support for ARM's own GPU.
+- **ARM2D GPU support** Get support for Arm's Microcontroller 2D Graphics Acceleration, e.g. Helium based acceleration, DMA-350 based acceleration etc.
 - **PubSub messaging** A publisher-subscriber based messaging system is added to make communication between components easier. See more [here](https://docs.lvgl.io/master/others/msg.html).
 - **Pinyin IME** Add support for Pinyin IME Chinese input. See more [here](https://docs.lvgl.io/master/others/ime_pinyin.html).
 - **render_start_cb** A new callback is added to `lv_disp_drv_t` to indicate when the rendering starts. It's useful to make synchronization, e.g. wait for a TE signal.

docs/get-started/platforms/index.md

@@ -12,5 +12,6 @@
    arduino
    tasmota-berry
    cmake
+   mdk
 ```
 

docs/get-started/platforms/mdk.md

@@ -0,0 +1,4 @@
+
+# MDK
+
+TODO

docs/intro/index.md

@@ -98,15 +98,16 @@ The changes are recorded in [CHANGELOG.md](/CHANGELOG).
 Before v8 the last minor release of each major series was supported for 1 year.
 Starting from v8, every minor release is supported for 1 year.
 
-| Version | Release date | Support end | Active |
-|---------|--------------|-------------|--------|
-| v5.3    | Feb 1, 2019  |Feb 1, 2020  | No     |
-| v6.1    | Nov 26, 2019 |Nov 26, 2020 | No     |
-| v7.11   | Mar 16, 2021 |Mar 16, 2022 | No     |
-| v8.0    | 1 Jun, 2021  |1 Jun, 2022  | Yes    |
-| v8.1    | 10 Nov, 2021 |10 Nov, 2022 | Yes    |
-| v8.2    | 31 Jan, 2022 |31 Jan, 2023 | Yes    |
-| v8.3    | In progress  |             |        |
+| Version | Release date | Support end  | Active |
+| ------- | ------------ | ------------ | ------ |
+| v5.3    | Feb 1, 2019  | Feb 1, 2020  | No     |
+| v6.1    | Nov 26, 2019 | Nov 26, 2020 | No     |
+| v7.11   | Mar 16, 2021 | Mar 16, 2022 | No     |
+| v8.0    | 1 Jun, 2021  | 1 Jun, 2022  | No     |
+| v8.1    | 10 Nov, 2021 | 10 Nov, 2022 | Yes    |
+| v8.2    | 31 Jan, 2022 | 31 Jan, 2023 | Yes    |
+| v8.3    | 6 July, 2022 | 6 July, 2023 | Yes    |
+| v9.0    | In progress  |              |        |
 
 ## FAQ
 
@@ -123,7 +124,7 @@ Every MCU which is capable of driving a display via parallel port, SPI, RGB inte
 
 This includes:
 - "Common" MCUs like STM32F, STM32H, NXP Kinetis, LPC, iMX, dsPIC33, PIC32, SWM341 etc.
-- Bluetooth, GSM, Wi-Fi modules like Nordic NRF and Espressif ESP32
+- Bluetooth, GSM, Wi-Fi modules like Nordic NRF, Espressif ESP32 and Raspberry Pi Pico W
 - Linux with frame buffer device such as /dev/fb0. This includes Single-board computers like the Raspberry Pi
 - Anything else with a strong enough MCU and a peripheral to drive a display
 

docs/overview/renderers/arm-2d.md

@@ -1,4 +1,32 @@
-# ARM-2D GPU
+# Arm-2D GPU
 
-TODO
+Arm-2D is not a GPU but **an abstraction layer for 2D GPUs dedicated to Microcontrollers**. It supports all Cortex-M processors ranging from Cortex-M0 to the latest Cortex-M85. 
 
+Arm-2D is an open-source project on Github. For more, please refer to: https://github.com/ARM-software/Arm-2D.
+
+
+
+## How to Use
+
+In general, you can set the macro `LV_USE_GPU_ARM2D` to `1`in `lv_conf.h` to enable Arm-2D acceleration for LVGL.
+
+If you are using **[CMSIS-Pack](https://github.com/lvgl/lvgl/tree/master/env_support/cmsis-pack)** to deploy the LVGL. You don't have to define the macro `LV_USE_GPU_ARM2D` manually, instead, please select the component `GPU Arm-2D` in the **RTE** dialog. This step will define the macro for us. 
+
+
+
+## Design Considerations
+
+As mentioned before, Arm-2D is an abstraction layer for 2D GPU; hence if there is no accelerator or dedicated instruction set (such as Helium or ACI) available for Arm-2D, it provides negligible performance boost for LVGL (sometimes worse) for regular Cortex-M processors. 
+
+**We highly recommend you enable Arm-2D acceleration for LVGL** when:
+
+- The target processors are **Cortex-M55** and/or **Cortex-M85**
+- The target processors support **[Helium](https://developer.arm.com/documentation/102102/0103/?lang=en)**.
+- The device vendor provides an arm-2d compliant driver for their propriotory 2D accelerators and/or customized instruction set.
+- The target device contains [DMA-350](https://community.arm.com/arm-community-blogs/b/internet-of-things-blog/posts/arm-corelink-dma-350-next-generation-direct-memory-access-for-endpoint-ai)
+
+
+
+## Examples
+
+- [A Cortex-M55 (supports Helium) based MDK Project, PC emulation is available.](https://github.com/lvgl/lv_port_an547_cm55_sim)