board: toradex: add verdin imx8m plus support

This adds initial support for the Toradex Verdin iMX8M Plus Quad 4GB WB
IT V1.0B module. They are strapped to boot from eFuses which are factory
fused to properly boot from their on-module eMMC. U-Boot supports
booting from the on-module eMMC only, SDP support is disabled for now
due to missing i.MX 8M Plus USB support.

Functionality wise the following is known to be working:
- eMMC, 8-bit and 4-bit MMC/SD card slots
- Ethernet both on-module eQoS and FEC (requires PHY on carrier board)
- GPIOs
- I2C

Boot sequence is:
SPL ---> ATF (TF-A) ---> U-boot proper

ATF, U-boot proper and u-boot.dtb images are packed into a FIT image,
loaded by SPL.

Boot:
U-Boot SPL 2022.04-rc1-00164-g21a0312611-dirty (Feb 07 2022 - 11:34:04 +0100)
Quad die, dual rank failed, attempting dual die, single rank configuration.
Normal Boot
WDT:   Started watchdog@30280000 with servicing (60s timeout)
Trying to boot from BOOTROM
Find img info 0x&48025a00, size 872
Need continue download 1024
Download 779264, Total size 780424
NOTICE:  BL31: v2.2(release):rel_imx_5.4.70_2.3.2_rc1-5-g835a8f67b
NOTICE:  BL31: Built : 16:52:37, Aug 26 2021

U-Boot 2022.04-rc1-00164-g21a0312611-dirty (Feb 07 2022 - 11:34:04 +0100)

CPU:   Freescale i.MX8MP[8] rev1.1 at 1200 MHz
Reset cause: POR
DRAM:  8 GiB
Core:  78 devices, 18 uclasses, devicetree: separate
WDT:   Started watchdog@30280000 with servicing (60s timeout)
MMC:   FSL_SDHC: 1, FSL_SDHC: 2
Loading Environment from MMC... OK
In:    serial
Out:   serial
Err:   serial
Model: Toradex Verdin iMX8M Plus Quad 4GB Wi-Fi / BT IT V1.0B, Serial# 06817281
Carrier: Toradex Verdin Development Board V1.1A, Serial# 10807609
Setting variant to wifi
Net:   Hard-coding pdata->enetaddr
eth1: ethernet@30be0000, eth0: ethernet@30bf0000 [PRIME]
Hit any key to stop autoboot:  0
Verdin iMX8MP #

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>

2 files changed, 112 insertions, 0 deletions

diff --git a/doc/board/toradex/index.rst b/doc/board/toradex/index.rst
index 56528480197..1cd926a7303 100644
--- a/doc/board/toradex/index.rst
+++ b/doc/board/toradex/index.rst
@@ -11,3 +11,4 @@ Toradex
    colibri_imx7
    colibri-imx8x
    verdin-imx8mm
+   verdin-imx8mp
diff --git a/doc/board/toradex/verdin-imx8mp.rst b/doc/board/toradex/verdin-imx8mp.rst
new file mode 100644
index 00000000000..482f6935779
--- /dev/null
+++ b/doc/board/toradex/verdin-imx8mp.rst
@@ -0,0 +1,111 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Verdin iMX8M Plus Module
+========================
+
+Quick Start
+-----------
+
+- Build the ARM trusted firmware binary
+- Get the DDR firmware
+- Build U-Boot
+- Flash to eMMC
+- Boot
+
+Get and Build the ARM Trusted Firmware (Trusted Firmware A)
+-----------------------------------------------------------
+
+.. code-block:: bash
+
+    $ echo "Downloading and building TF-A..."
+    $ git clone https://git.trustedfirmware.org/TF-A/trusted-firmware-a.git
+    $ cd trusted-firmware-a
+
+Then build ATF (TF-A):
+
+.. code-block:: bash
+
+    $ export CROSS_COMPILE=aarch64-linux-gnu-
+    $ make PLAT=imx8mp IMX_BOOT_UART_BASE=0x30880000 bl31
+    $ cp build/imx8mp/release/bl31.bin ../
+
+Get the DDR Firmware
+--------------------
+
+.. code-block:: bash
+
+    $ cd ..
+    $ wget https://www.nxp.com/lgfiles/NMG/MAD/YOCTO/firmware-imx-8.10.1.bin
+    $ chmod +x firmware-imx-8.10.1.bin
+    $ ./firmware-imx-8.10.1.bin
+    $ cp firmware-imx-8.10.1/firmware/ddr/synopsys/lpddr4*_202006.bin ./
+
+Build U-Boot
+------------
+.. code-block:: bash
+
+    $ export CROSS_COMPILE=aarch64-linux-gnu-
+    $ make verdin-imx8mp_defconfig
+    $ make
+
+Flash to eMMC
+-------------
+
+.. code-block:: bash
+
+    > tftpboot ${loadaddr} flash.bin
+    > setexpr blkcnt ${filesize} + 0x1ff && setexpr blkcnt ${blkcnt} / 0x200
+    > mmc dev 2 1 && mmc write ${loadaddr} 0x0 ${blkcnt}
+
+As a convenience, instead of the last two commands one may also use the update
+U-Boot wrapper:
+
+.. code-block:: bash
+
+    > run update_uboot
+
+Boot
+----
+
+ATF, U-Boot proper and u-boot.dtb images are packed into FIT image,
+which is loaded and parsed by SPL.
+
+Boot sequence is:
+
+* SPL ---> ATF (TF-A) ---> U-Boot proper
+
+Output:
+
+.. code-block:: bash
+
+U-Boot SPL 2022.04-rc1-00164-g21a0312611-dirty (Feb 07 2022 - 11:34:04 +0100)
+Quad die, dual rank failed, attempting dual die, single rank configuration.
+Normal Boot
+WDT:   Started watchdog@30280000 with servicing (60s timeout)
+Trying to boot from BOOTROM
+Find img info 0x&48025a00, size 872
+Need continue download 1024
+Download 779264, Total size 780424
+NOTICE:  BL31: v2.2(release):rel_imx_5.4.70_2.3.2_rc1-5-g835a8f67b
+NOTICE:  BL31: Built : 16:52:37, Aug 26 2021
+
+
+U-Boot 2022.04-rc1-00164-g21a0312611-dirty (Feb 07 2022 - 11:34:04 +0100)
+
+CPU:   Freescale i.MX8MP[8] rev1.1 at 1200 MHz
+Reset cause: POR
+DRAM:  8 GiB
+Core:  78 devices, 18 uclasses, devicetree: separate
+WDT:   Started watchdog@30280000 with servicing (60s timeout)
+MMC:   FSL_SDHC: 1, FSL_SDHC: 2
+Loading Environment from MMC... OK
+In:    serial
+Out:   serial
+Err:   serial
+Model: Toradex Verdin iMX8M Plus Quad 4GB Wi-Fi / BT IT V1.0B, Serial# 06817281
+Carrier: Toradex Verdin Development Board V1.1A, Serial# 10807609
+Setting variant to wifi
+Net:   Hard-coding pdata->enetaddr
+eth1: ethernet@30be0000, eth0: ethernet@30bf0000 [PRIME]
+Hit any key to stop autoboot:  0
+Verdin iMX8MP #