[U-Boot] [PATCH 10/13] at91: move usb driver to drivers/usb

[ksi at koi8.net]

On Wed, 1 Apr 2009, Stefan Roese wrote:

> On Tuesday 31 March 2009, Wolfgang Denk wrote:
> > In message <20090331192117.GF24923 at game.jcrosoft.org> you wrote:
> > > > >  drivers/usb/Makefile                        >        |    1 +
> > > > >  .../at91/usb.c => drivers/usb/atmel_usb.c          |  >   0
> > > > >  rename cpu/arm926ejs/at91/usb.c => drivers/usb/atmel_usb.c
> (100%)
> > > >
> > > > Same here, this is architecture specific code, why move it to
> generic
> > > > cod> e?
> > >
> > > it's the at91 usb drivers and we need to have it in the driver/usb
> >
> > Why do we need to have it in the driver/usb ?
> >
> > Please explain in detail.
> 
> >From what I remember we all agreed to move the device drivers (e.g.
> ethernet, 
> NAND, USB, serial etc) from the architecture/board (cpu/... board/...)
> to the 
> drivers directories at some time.
> 
> Speaking for PPC4xx, the 4xx ethernet driver has recently been moved
> from 
> cpu/ppc4xx to drivers/net. And I'm planning to move the 4xx NAND driver
> (and 
> others) soon too.
> 
> So if this atmel_usb.c driver isn't just platform USB init code, but a
> real 
> USB driver, then I'm voting to move it to drivers/usb as well.

I also vote for moving _ALL_ the drivers (i2c, usb, net, etc.) to
appropriate directories under drivers/ no matter architecture specific they
are or not.

This will make the tree more logical and one wouldn't have to chase say USB
driver all over the source tree.

Also it is a first step to general overhaul that would allow for multiple
drivers support. The fact some SoC has a built-in, say USB controller does
_NOT_ mean there is no more USB controllers on the same board. Some can be
on PCI bus etc. The same is true for each and every other driver. And we
should _NOT_ treat some drivers (e.g. SPI) as marginal. AT91RM9200 for
example can _NOT_ boot off of parallel flash because of silicon error so it
boots off of SPI DataFlash thus making SPI driver essential for the system.

To contain drivers is a reason for drivers/* to exist, isn't it?

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