Re: Driver(s) for Synopsys' DesignWare USB OTG

On Sun, Jan 08, 2012 at 04:56:49PM +0400, Nikolai Zhubr wrote:

Hello Piter,

08.01.2012 7:12, you wrote:

quoted

2012/1/8 Nikolai Zhubr[off-list ref]:

Please see:
http://marc.info/?l=linux-usb&m=129906859817430&w=2

Ah, thanks. So sadly uncoordinated work in this area is quite
common. However, in case of Synopsys the situation is even more
disappointing because initially it _was_ a single driver! What
probably lacked was some shared repository and proper communication
between developers to stay in sync. Maybe there were also licensing
issues at some point, though currently file headers contain rather
reasonable (imho) permissive license from Synopsys.

quoted

I am not sure we can combine all Synopsys USB drivers to single file, but we

Synopsys driver which I examine consists of 16 files (each of 2
versions), 200k lines total. I've already perpared some few smaller
files for version merging. So probably it is doable, but quite a lot
of work, therefore I wouldn't like it to be wasted.

I mean one file is just a common udc driver for all Synopsys, not all usb file.
For ehci, I think it will be easier to use single file as well as 
some specific SoC's quirks if needed.
For udc, as there is no standard spec for how usb device should be designed,
maybe different Synopsys IPs have a little different for work flow.
For otg, it  should be not difficult after we split PHY's operation
from the otg, as common otg operation is the same.

quoted

can try combine similar IP versions to one file, this work may need all Synopsys
USB IP driver maintainer work together.

Exactly. This is why I'm now trying to find all relevant people to
begin with.

I know someone(@Pengutronix and @linux.intel.com) is doing that. I think first
we should find which driver file at current code base is most capable and
compatible. I would like to help it, and verify it at Freescale i.MX SoCs.

Thank you.
Nikolai.

Please CC me, I'm not subscribed to the lists.

quoted

quoted

Thank you.
Nikolai.
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Best Regards,
Peter Chen