[U-Boot] dm: device_id info

Hi,

I'm exploring internals of dm where I'm just comparing udevice with Linux model especially on device_id scenarios.

udevice_id - u-boot

Linux: -------- platform_device_id of_device_id

spi_device_id input_device_id .............. ....... pci_device_id

1. Does this udevice_id is a generic model in u-boot for all variant of devices? Bcz Linux defines each devices have own device_id entries. 2. diff of of_device_id vs udevice_id 3. udevice_id vs fdt function calls, suppose If I write a dm driver where my board doesn't have fdt support, is this a valid scenario. 4. Pls- add any info which I haven't covered.

thanks!