examples: I2C Driver Model in Standalone Applications

[Joshua Estes]

Hey all,

I am currently trying to build a standalone application using the driver
model functions to interface with the Designware I2C Controller on my SoC.
I believe I have correctly used the driver model functions such that I can
read and write to an I2C device, but when I try to compile the code with
the following configuration options added to socfpga_de10_nano_defconfig I
get a few errors from the linker about undefined references to
"uclass_get_device_by_seq", "dm_i2c_probe", and "dm_i2c_read".

CONFIG_DM=y
CONNFIG_CMD_I2C=y
CONFIG_API=y
CONFIG_EXAMPLES=y
CONFIG_STANDALONE_LOAD_ADDR=0x0c100000
CONFIG_SYS_MMC_MAX_DEVICE=1

My code is located at:
https://github.com/jestes15/DE10-Nano_u-boot-socfpga/blob/socfpga_v2024.07/examples/standalone/i2c_test.c

What do I need to do that would allow me to compile my standalone
application? Is there documentation I can read that explains more of this,
I have looked through this "https://docs.u-boot.org/en/latest/" and
didn't see anything.

Very respectfully,
Joshua Estes