[U-Boot] [PATCH v7] Add generic ULPI layer

[Marek Vasut <marek.vasut@gmail.com>]

> Although it is a single patch, I felt that a cover letter will
> definetly not hurt here, also the patch version history is so big, so
> I decided to move it here.
> 
> The ULPI (UTMI Low Pin (count) Interface) PHYs are widely used on
> variety of boards. This requires a generic architecture independant
> implementation which can be reused and will eliminate the need for
> direct write of arbitrary values to the ULPI transciever.
> Although, the generic implementation can be reused on any architecture,
> the access to ULPI PHY must be done in a platform specific way.
> The platform specific way is in majority of case called a viewport.
> Also, the ULPI specification defines a hybrid aproach for managing the
> ULPI PHY. That is, the PHY must be managed through both the PHY registers
> and control lines.
> 
> The proposed patch provides a partial implementation of the ULPI
> specification, which should be enough for boot loader use cases,
> and a viewport implementation for Chipidea/ARC based controllers,
> which, AFAIK, are used on imx and tegra SoCs.
> 
> It is based on the Wolfgang's master branch (4 Dec 2012),
> compile tested and checkpatch clean.
> 
> What is still missing, IMO:
> 	- documentation for the CONFIG_* macros (I can add it in a separate 
patch)
> 	- a way to make most of the initialization in one ulpi_init() call
> 	- viewport extension to be able to implement resume,
> 	  reset and disabling the serial mode
> 
> The change log:
> Changes for v2:
> 	- make code EHCI-independent
> 	- use udelay() in waiting loop
> 	- mark static functions as static
> 	- naming changes
> Changes for v3:
> 	- merge with patch ulpi: add generic ULPI support header file
> 	- rewrite ULPI interface in more functionality-oriented way
> Changes for v4:
> 	- add error-checking
> 	- add waiting for completion into ulpi_reset() function
> Changes for v5:
> 	- CodingStyle changes
> 	- add comments
> 	- simplify implemenation of the ULPI interface functions
> Changes for v6:
> 	- cleanup function ulpi_drive_vbus()
> Changes for v7:
> 	- ulpi-viewport.c:
> 		- reorder bit definitions
> 		- split ulpi_request() to two functions
> 		- reuse ulpi_wakeup() from ulpi_request()
> 		  to remove duplicated calls from ulpi_{read|write}()
> 		- inline ulpi_*_mask as it is simple and used only once
> 	- ulpi.c:
> 		- move several defines into c file
> 		- rework all the functions to propagate error values
> 		- move function description comments into ulpi.h
> 		  along with declarations
> 		- check arguments validity (as suggested by Simon)
> 		- fix cases when using the *_set register,
> 		  bits cannot be cleared
> 		- shorten several arguments names (e.g. ulpi_set_vbus())
> 		- add ability to disable VBUS
> 		- clean up ulpi_set_pd()
> 		- add ability to enter the serial mode
> 		- add verbosity in error cases
> 		- remove ulpi_resume() as it were wrong and
> 		  must be implemented in a viewport specific way
> 		- rework ulpi_reset() as it must be implemented in a
> 		  viewport specific way, but provide kind of generic
> 		  implementation which should work in most of the cases
> 	- ulpi.h:
> 		- add default timeout value
> 		- remove unused defines
> 		- move several defines inside c files
> 		- add description for each function
> 		- move the API declaration to the top of the header file
> 
> Jana Rapava (1):
>   USB: Add generic ULPI layer and a viewport
> 
>  Makefile                         |    1 +
>  drivers/usb/ulpi/Makefile        |   44 ++++++
>  drivers/usb/ulpi/ulpi-viewport.c |  118 +++++++++++++++
>  drivers/usb/ulpi/ulpi.c          |  227 +++++++++++++++++++++++++++++
>  include/usb/ulpi.h               |  298
> ++++++++++++++++++++++++++++++++++++++ 5 files changed, 688 insertions(+),
> 0 deletions(-)
>  create mode 100644 drivers/usb/ulpi/Makefile
>  create mode 100644 drivers/usb/ulpi/ulpi-viewport.c
>  create mode 100644 drivers/usb/ulpi/ulpi.c
>  create mode 100644 include/usb/ulpi.h

Igor, please add Cc annotations to this patch too.

M