[RFC PATCH 0/8] MXS: Add i.MX28 USB Host driver

[marex@denx.de (Marek Vasut)]

Dear Dirk Behme,

> Hi Marek,
> 
> On 17.04.2012 12:15, Marek Vasut wrote:
> > This patchset introduces the USB Host driver for i.MX28 CPU, utilising
> > the generic USB PHY infrastructure.
> 
> Great, many thanks!

Hey, this is still RFC and will need a great discussion.

> 
> Unfortunately, I lost the overview over the i.MXxx USB discussion ;)

Well I put parts together from the old patchset, did some coding on my own ... I 
still have a few places where I'm very uncertain about so please, review 
thoroughly.

> 
> Could this be used to add support for the mx53 and mx6, too? If yes,
> what do you think would be needed for this?

Yes, that's the plan actually. But, isn't mx53 supported by ehci-mxc? I thought 
the USB PHY core from mx28 was then reused only in mx6q.

You'd have to add support for some clock handling probably (enabling the USB 
clock on mx53 and maybe some other clock, I'm not quite sure now without the 
manual), but that should be about it. The MX6q PHY on the other hand looks quite 
similar to mx28 so it should be easy hacking.

> 
> Best regards
> 
> Dirk
> 
> P.S.: What I read from the discussion:
> 
> -- cut --
> All recent Freescale SoC's USB controller are the same, they are mx23,
> mx25, mx28, mx31, mx35, mx37, mx50, mx51, mx53, and mx6. But, the
> transceiver is different between them
> * mx23, mx28, mx6 (Transceiver A)
> * mx25 mx31, mx35,mx37, mx50, mx51, mx53 (Transceiver B)
> -- cut --
> 
> > Marek Vasut (8):
> >   MXS: Make clk_disable return integer
> >   MXS: Add USB EHCI and USB PHY clock handling
> >   MXS: Fixup i.MX233 USB base address name
> >   MXS: Add platform registration hooks for USB EHCI
> >   MXS: Add USB PHY driver
> >   MXS: Add separate MXS EHCI HCD driver
> >   MXS: Enable USB on M28EVK
> >   MXS: Enable USB on MX28EVK
> >  
> >  arch/arm/mach-mxs/Kconfig                       |    4 +
> >  arch/arm/mach-mxs/clock-mx28.c                  |   28 +-
> >  arch/arm/mach-mxs/devices-mx28.h                |    4 +
> >  arch/arm/mach-mxs/devices/Kconfig               |    3 +
> >  arch/arm/mach-mxs/devices/Makefile              |    1 +
> >  arch/arm/mach-mxs/devices/platform-usb.c        |   79 ++++++
> >  arch/arm/mach-mxs/include/mach/clock.h          |    2 +-
> >  arch/arm/mach-mxs/include/mach/devices-common.h |    9 +
> >  arch/arm/mach-mxs/include/mach/mx23.h           |    8 +-
> >  arch/arm/mach-mxs/mach-m28evk.c                 |   10 +
> >  arch/arm/mach-mxs/mach-mx28evk.c                |   10 +
> >  drivers/usb/host/Kconfig                        |    7 +
> >  drivers/usb/host/ehci-hcd.c                     |    5 +
> >  drivers/usb/host/ehci-mxs.c                     |  309
> >  +++++++++++++++++++++++ drivers/usb/otg/Kconfig                        
> >  |    9 +
> >  drivers/usb/otg/Makefile                        |    1 +
> >  drivers/usb/otg/mxs-phy.c                       |  256
> >  +++++++++++++++++++ 17 files changed, 736 insertions(+), 9 deletions(-)
> >  create mode 100644 arch/arm/mach-mxs/devices/platform-usb.c
> >  create mode 100644 drivers/usb/host/ehci-mxs.c
> >  create mode 100644 drivers/usb/otg/mxs-phy.c
> > 
> > Cc: Chen Peter-B29397 <B29397@freescale.com>
> > Cc: Detlev Zundel <dzu@denx.de>
> > Cc: Fabio Estevam <festevam@gmail.com>
> > Cc: Li Frank-B20596 <B20596@freescale.com>
> > Cc: Lin Tony-B19295 <B19295@freescale.com>
> > Cc: Linux USB <linux-usb@vger.kernel.org>
> > Cc: Sascha Hauer <s.hauer@pengutronix.de>
> > Cc: Shawn Guo <shawn.guo@freescale.com>
> > Cc: Shawn Guo <shawn.guo@linaro.org>
> > Cc: Stefano Babic <sbabic@denx.de>
> > Cc: Subodh Nijsure <snijsure@grid-net.com>
> > Cc: Tony Lin <tony.lin@freescale.com>
> > Cc: Wolfgang Denk <wd@denx.de>

Best regards,
Marek Vasut