[U-Boot-Users] [Patch 0/9] U-boot-V2: Introduce I2C support for SDP3430

[Robert Schwebel <r.schwebel@pengutronix.de>]

On Wed, Jun 18, 2008 at 03:21:02PM -0500, Menon, Nishanth wrote:
> > - Please don't bring in things which are not part of the current code
> >   base. If you add code for subsystems, the subsystems must be there
> >   first and *then* their users. Otherwhise we bloat the codebase and we
> >   disable the possibility to add *real* support for PCI, USB and S390
> >   later :-)
>
> Acked. Yep will redo that :).

Yea, looking forward especially for PCI patches :-)

> > Which part of i2c do we actually *need* in the bootloader? What's
> > *your* use case?
>
> I need i2c_transfer -yes - I can customize the changes just for that.
> I do like i2c_transfers, adapters, clients etc.. my immediate need is
> rather simple -> i2c_transfers.

Ok, so let's start with that.

> > I assume we need i2c host controllers, that's quite clear. We also need
> > an abstraction for i2c devices. The only devices I have seen which
> > really needed a bootloader driver are
> >
> > a) eeproms
> > b) RTCs
> > c) analog/digital in/outputs (i.e. gpio expanders)
> >
> > Other use cases?
>
> USB Transceivers, power management devices.

Yes, but I think what we most of all need is the i2c communication with
the device. We should think about if the abstraction of the devices
*behind* the bus brings us anything; note that you can do lots of things
in scripts in u-boot-v2. Linke writing a shell function for your usb
transceivers which just encapsulates the right predefined i2c_read/write
operations.

> Are we ok with i2ctools movement here?

Hmm? How do you mean that?

rsc
-- 
 Dipl.-Ing. Robert Schwebel | http://www.pengutronix.de
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