doc/driver-model/serial-howto.txt

1 How to port a serial driver to driver model
4 Almost all of the serial drivers have been converted as at January 2016. These
13 Here is a suggested approach for converting your serial driver over to driver
16 - #ifdef out all your own serial driver code (#ifndef CONFIG_DM_SERIAL)
17 - Define CONFIG_DM_SERIAL for your board, vendor or architecture
18 - If the board does not already use driver model, you need CONFIG_DM also
19 - Your board should then build, but will not boot since there will be no serial
21 - Add the U_BOOT_DRIVER piece at the end (e.g. copy serial_s5p.c for example)
22 - Add a private struct for the driver data - avoid using static variables
23 - Implement each of the driver methods, perhaps by calling your old methods
24 - You may need to adjust the function parameters so that the old and new
26 - If you convert all existing users of the driver, remove the pre-driver-model
30 - clean up / prepare the driver for conversion
31 - add driver model code
32 - convert at least one existing board to use driver model serial
33 - (if no boards remain that don't use driver model) remove the old code
38 - define CONFIG_OF_CONTROL and CONFIG_OF_SEPARATE
39 - add your device tree files to arch/<arch>/dts
40 - update the Makefile there
41 - Add stdout-path to your /chosen device tree node if it is not already there
42 - build and get u-boot-dtb.bin so you can test it
43 - Your drivers can now use device tree
44 - For device tree in SPL, define CONFIG_SPL_OF_CONTROL