[U-Boot] Marvell Kirkwood newbie question GPIO functions

[Dieter Kiermaier <dk-arm-linux@gmx.de>]

Hi again,


> Hi Prafulla,
>
> > It's my pleasure to reply you :-)
> > Basic Kirkwood Soc Support patches are available on the
> > u-boot-arm.git/next (will be mainlined soon) Sheevaplug board support
> > patches are also submitted those are under review, you can find them
> > here...
> > http://lists.denx.de/pipermail/u-boot/2009-June/054313.html
> > http://lists.denx.de/pipermail/u-boot/2009-June/054314.html
> > http://lists.denx.de/pipermail/u-boot/2009-June/054316.html
> >
> > Some other board patches are in pipeline
>
> thanks very much for your help.
> So far I have seen that marvell git u-boot is used to push it to mainline.
> Great job!
> What patches are in the pipeline?
>
> > > Currently I'm using the u-boot from git.marvell.com which has
> > > first board support for sheevaplug. I'm working on a custom
> > > hardware design but as a starting point the sheevaplug seems
> > > to work well.
> >
> > Objective for U-boot at git.marvell.com is to maintain a usable copy of
> > u-boot with all accepted/unaccepted patches at one place to support
> > Kirkwood developers, but once all these patches are mainlined, this
> > repository will be removed.
> >
> > > Sadly there is no generic gpio support - at least I couldn't find it.
> > > Are there any plans to support a driver for this feature?
> >
> > BTW: what you want to do at u-boot level with GPIOs?
> > Current Kirkwood drivers and board support does not need any specific
> > GPIO driver, you can access registers directly to read/write GPIOs. But I
> > think if this is a need in future, I will add gpio driver support. You
> > can provide me your requirements too.
>
> I'm working on a custom hardware using the sheevaplug as a starting point.
> Hopefully end of summer I finish the hardware work and have my own board.
> But I have some additional requirements. For example control some power
> supplies for LCD, boot an FPGA, program a clock chip device and so on.
> So my demands are:
> - GPIO support (for programming the clock generator which has a simple
> serial interface to clock in the configuration data)
> ????????Yeah, I know that I can setup the GPIOs by writing directly to the
> registers,
> ????????but a gpio frameworks would be much nicer ;)
>
> - SPI (from the TDM module) support which works independet
> ? from NAND flash and SD-Card
>
> I have allready posted a query to arm-linux kernel mailing list and
> yesterday evening I have talked with Lennert on IRC regarding SPI and linux
> .
>
> The SPI interface is needed in u-boot to boot my lattice FPGA
> which is configured as slave serial device (and later on in linux to drive
> a touch controller).
> There is allready a FPGA configuration framework inside u-boot
> and I would like to integrate also a lattice FPGA into that. But to do this
> I need SPI support.


What I forgot to mention is the i2c driver inside u-boot.
I need this to read the mac address from an additional eeprom.
This makes mass production more ease and doesn't produce hight costs :)

Dieter

>
> > > I'm willing to contribute some code if someone guides me a bit?
> >
> > You are most welcomed....
> > Pls feel free to raise your queries...
>
> Here they are :)
> Thanks,
> Dieter
>
> > Regards..
> > Prafulla . .
> >
> > > Thanks in advance,
> > > Dieter
> > >
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