diff options
| author | Simon Glass <sjg@chromium.org> | 2014-02-26 15:59:27 -0700 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2014-03-04 12:15:30 -0500 |
| commit | f9aa6a1086f6b7da1814a2c95feefa91c9c4b593 (patch) | |
| tree | afc79b7da6aa52de764ed53bf6b4c3a63a03b0df /doc/driver-model/UDM-twserial.txt | |
| parent | 95a260a98c010321cdc5f2acd1f4272b9c0a19dc (diff) | |
dm: Remove old driver model documentation
This documentation pertains to the planned implementation of driver model
in U-Boot for each subsystem, but it has not been superseded. It is
probably better to have this documentation in the source code for each
subsystem where possible, so that docbook will pick it up. Where this does
not make sense, new documentation can be placed in some suitable file in
doc/driver-model.
Signed-off-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc/driver-model/UDM-twserial.txt')
| -rw-r--r-- | doc/driver-model/UDM-twserial.txt | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/doc/driver-model/UDM-twserial.txt b/doc/driver-model/UDM-twserial.txt deleted file mode 100644 index 5f2c5a3d40..0000000000 --- a/doc/driver-model/UDM-twserial.txt +++ /dev/null @@ -1,47 +0,0 @@ -================================== -TWserial device subsystem analysis -================================== - -Tomas Hlavacek<tmshlvck@gmail.com> -2012-03-21 - -I) Overview ------------ - -U-Boot currently implements one common API for TWSerial devices. The interface -is defined in include/tws.h and comprises of functions: - - int tws_read(uchar *buffer, int len); - int tws_write(uchar *buffer, int len); - -The functions are implemented by a proper device driver in drivers/twserial -directory and the driver to be compiled in is selected in a Makefile. There is -only one driver present now. - -The driver depends on ad-hoc code in board specific data, namely functions: - - void tws_ce(unsigned bit); - void tws_wr(unsigned bit); - void tws_clk(unsigned bit); - void tws_data(unsigned bit); - unsigned tws_data_read(void); - void tws_data_config_output(unsigned output); - -implemented in include/configs/inka4x0.h . - -II) Approach ------------- - - U-Boot TWserial drivers exports two simple functions and therefore the conversion - of the driver and creating a core for it is not needed. It should be consolidated - with include/configs/inka4x0.h and taken to the misc/ dir. - - -III) Analysis of in-tree drivers --------------------------------- - - drivers/twserial/soft_tws.c - --------------------------- - The driver is the only TWserial driver. The ad-hoc part in - include/configs/inka4x0.h and the core soft_tws driver should be consolidated - to one compact driver and moved to misc/ . |