As the PHYTEC phyCORE-i.MX91 [1] is just another variant of the existing
PHYTEC phyCORE-i.MX93 SoM but with i.MX91 SoC populated instead, add it
to the existing board-code "phycore_imx93", and rename that board to
"phycore_imx91_93" to reflect the dual SoCs support. While at it, also
rename and change common files accordingly. This way i.MX91 and i.MX93
SoC variants of the phyCORE SoM share most of the code and documentation
without duplication, while maintaining own device-tree and defconfigs
for each CPU variant.

Supported features:
 - 1GB LPDDR4 RAM
 - Debug UART
 - EEPROM
 - eMMC
 - Ethernet
 - SD-card
 - USB

Product page SoM:
[1] https://www.phytec.eu/en/produkte/system-on-modules/phycore-imx-91-93/

Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>

Drop SUPPORT_EXTENSION_SCAN and enable PHYTEC_SOM_DETECTION_BLOCKS
to align with other PHYTEC platforms. These options were missed when
phyCORE-AM62Ax support was added.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>

Add the option to choose a different bus number than 0 for the i2c eeprom
based som detection.

Signed-off-by: Dominik Haller <d.haller@phytec.de>
Signed-off-by: Wadim Egorov <w.egorov@phytec.de>

Add the phyCORE-AM62Ax to our common board directory to
enable our SOM detection for this product.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Signed-off-by: Wadim Egorov <w.egorov@phytec.de>

The phyCORE-i.MX 93 is available in various variants. Relevant variant
options for the spl/u-boot are:
- with or without HS400 support for the eMMC
- with 1GB ram chip, or 2GB ram chip

The phyCORE's eeprom contains all information about the existing variant
options. Add evaluation of the eeprom data to the spl/u-boot to
enable/disable HS400 and to select the appropriate ram configuration at
startup.

Signed-off-by: Christoph Stoidner <c.stoidner@phytec.de>
Reviewed-by: Wadim Egorov <w.egorov@phytec.de>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Primoz Fiser <primoz.fiser@norik.com>

Wadim Egorov <w.egorov@phytec.de> says:

Changes in v2:
  - Reabse to current next
  - Add Tested-by: John Ma <jma@phytec.com>
  - Add Kconfig option to select RAM size statically
  - Make board/phytec/common/k3 always compile for CONFIG_ARCH_K3

v1: https://lists.denx.de/pipermail/u-boot/2024-May/553057.html

SoM detection is using I2C driver model functions.
Let's depend on I2C.

Signed-off-by: Wadim Egorov <w.egorov@phytec.de>
Tested-by: John Ma <jma@phytec.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>

This API is based on a block structure with a 8 Byte large
API v3 header and various of different blocks following. It extends
our current API v2, which is always 32 Byte large, and is located
directly after v2.

Add the MAC block as first block type. It contains the physical
Ehternet interface number, a MAC address and a CRC checksum over the
MAC payload.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>
Tested-by: Wadim Egorov <w.egorov@phytec.de>

Add all functions to read each SOM option from the EEPROM
image and detect whether it's the correct product for this
image.

Signed-off-by: Daniel Schultz <d.schultz@phytec.de>

Add imx8m specific detection part. Which includes checking the
EEPROM data for article number options.

Signed-off-by: Teresa Remmet <t.remmet@phytec.de>
Reviewed-by: Yannic Moog <y.moog@phytec.de>
Tested-by: Yannic Moog <y.moog@phytec.de>