[PATCH v8] board: mntre: imx8mq: Add MNT Reform 2 board support

[Vagrant Cascadian]

On 2023-02-06, Patrick Wildt wrote:
> The MNT Reform 2 is a modular DIY laptop.  In its initial version it
> is based on the BoundaryDevices i.MX8MQ SoM.  Some parts have been
> lifted from BoundaryDevices official U-Boot downstream project.
>
> Signed-off-by: Patrick Wildt <patrick at blueri.se>

Tested booting Debian with a 6.1.x linux kernel on a mnt/reform2 using
nvme rootfs and microsd /boot. Some oddities with video and wifi that do
not occur with the vendor u-boot, but seems like huge progress.

Thanks!

Tested-by: Vagrant Cascadian <vagrant at debian.org>

> ---
> Changes since v7:
> - Re-added lost ramdisk_addr_r.
> Changes since v6:
> - Cleaned up some CONFIG_* pollution.
> Changes since v5:
> - Adjusted to further Binman changes.
> - Adjusted to further Kconfig conversions.
> - Removed some phy init in favor of DM.
> - Removed some pinmux which are now handled by DM_SERIAL.
> - Compared with Librem5/EVK and adjusted for similarity.
> Changes since v4:
> - Adjusted to Kconfig conversions.
> - Removed U-Boot-specific device tree changes.
> - Synced device tree to Linux v5.19-rc3.
> Changes since v3:
> - Adjusted to Binman changes in main branch.
> - Cleaned up environment variables akin to i.MX8MM.
> - Added vendor-prefix to device tree filename.
> - Provided ramdisk_addr_r.
> Changes since v2:
> - Switched to Binman.
> Changes since v1:
> - Synced DTS with files in Linux git repo.
> - Added support for USB host ports.
>
>  arch/arm/dts/imx8mq-mnt-reform2-u-boot.dtsi   |   11 +
>  arch/arm/mach-imx/imx8m/Kconfig               |    7 +
>  board/mntre/imx8mq_reform2/Kconfig            |   15 +
>  board/mntre/imx8mq_reform2/MAINTAINERS        |    7 +
>  board/mntre/imx8mq_reform2/Makefile           |   12 +
>  board/mntre/imx8mq_reform2/imx8mq_reform2.c   |  171 +++
>  board/mntre/imx8mq_reform2/lpddr4_timing.c    | 1014 +++++++++++++++++
>  .../mntre/imx8mq_reform2/lpddr4_timing_ch2.h  |   95 ++
>  board/mntre/imx8mq_reform2/spl.c              |  260 +++++
>  configs/imx8mq_reform2_defconfig              |  107 ++
>  include/configs/imx8mq_reform2.h              |   67 ++
>  11 files changed, 1766 insertions(+)
>  create mode 100644 arch/arm/dts/imx8mq-mnt-reform2-u-boot.dtsi
>  create mode 100644 board/mntre/imx8mq_reform2/Kconfig
>  create mode 100644 board/mntre/imx8mq_reform2/MAINTAINERS
>  create mode 100644 board/mntre/imx8mq_reform2/Makefile
>  create mode 100644 board/mntre/imx8mq_reform2/imx8mq_reform2.c
>  create mode 100644 board/mntre/imx8mq_reform2/lpddr4_timing.c
>  create mode 100644 board/mntre/imx8mq_reform2/lpddr4_timing_ch2.h
>  create mode 100644 board/mntre/imx8mq_reform2/spl.c
>  create mode 100644 configs/imx8mq_reform2_defconfig
>  create mode 100644 include/configs/imx8mq_reform2.h
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