doc: driver-model: Convert serial-howto.txt to reST

Convert plain text documentation to reStructuredText format and add
it to Sphinx TOC tree. No essential content change.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 0 insertions, 44 deletions

diff --git a/doc/driver-model/serial-howto.txt b/doc/driver-model/serial-howto.txt
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-How to port a serial driver to driver model
-===========================================
-
-Almost all of the serial drivers have been converted as at January 2016. These
-ones remain:
-
-   serial_bfin.c
-   serial_pxa.c
-
-The deadline for this work was the end of January 2016. If no one steps
-forward to convert these, at some point there may come a patch to remove them!
-
-Here is a suggested approach for converting your serial driver over to driver
-model. Please feel free to update this file with your ideas and suggestions.
-
-- #ifdef out all your own serial driver code (#ifndef CONFIG_DM_SERIAL)
-- Define CONFIG_DM_SERIAL for your board, vendor or architecture
-- If the board does not already use driver model, you need CONFIG_DM also
-- Your board should then build, but will not boot since there will be no serial
-    driver
-- Add the U_BOOT_DRIVER piece at the end (e.g. copy serial_s5p.c for example)
-- Add a private struct for the driver data - avoid using static variables
-- Implement each of the driver methods, perhaps by calling your old methods
-- You may need to adjust the function parameters so that the old and new
-    implementations can share most of the existing code
-- If you convert all existing users of the driver, remove the pre-driver-model
-    code
-
-In terms of patches a conversion series typically has these patches:
-- clean up / prepare the driver for conversion
-- add driver model code
-- convert at least one existing board to use driver model serial
-- (if no boards remain that don't use driver model) remove the old code
-
-This may be a good time to move your board to use device tree also. Mostly
-this involves these steps:
-
-- define CONFIG_OF_CONTROL and CONFIG_OF_SEPARATE
-- add your device tree files to arch/<arch>/dts
-- update the Makefile there
-- Add stdout-path to your /chosen device tree node if it is not already there
-- build and get u-boot-dtb.bin so you can test it
-- Your drivers can now use device tree
-- For device tree in SPL, define CONFIG_SPL_OF_CONTROL