RE: [RFC PATCHv1] usb: dwc2: Combine the dwc2 and s3c_hsotg into a single USB DRD driver.

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> From: Dinh Nguyen [mailto:dinguyen@xxxxxxxxxx]
> Sent: Tuesday, February 04, 2014 10:14 PM
> 
> On Wed, 2014-02-05 at 00:42 +0000, Paul Zimmerman wrote:
> > > From: dinguyen@xxxxxxxxxx [mailto:dinguyen@xxxxxxxxxx]
> > > Sent: Tuesday, February 04, 2014 1:46 PM
> > >
> > > From: Dinh Nguyen <dinguyen@xxxxxxxxxx>
> > >
> > > This means that the driver can be in host or peripheral mode when the appropriate
> > > connector is used. When an A-cable is plugged in, the driver behaves in host
> > > mode, and when a B-cable is used, the driver will be in peripheral mode.
> > >
> > > This commit:
> > > - Replaces in the defines used in s3c_hsotg.h with the defines used in the dwc2
> > >   hw.h defines.
> > > - Use the dw2_hsotg as the unified data structure for the host/gadget.
> > > - Uses the dwc2 IRQ handler for host/gadget.
> > > - A single spinlock.
> >
> > Hi Dinh,
> >
> > Putting all of these changes into a single patch makes them unreviewable
> > as far I am concerned. You need to break this into a series of smaller
> > patches. I would suggest something like this:
> >
> > 1 of n:  Make the minimum changes to the dwc2 header files needed to
> >          support s3c-hsotg as a standalone driver.
> > 2 of n:  Make the spelling changes to s3c-hsotg.c needed to use the dwc2
> >          headers, and move it to the dwc2/ directory. Make the Kconfig
> >          and Makefile changes needed for the move. Delete s3c-hsotg.h.
> > 3 of n:  Move the struct defines etc. from s3c-hsotg.c to the dwc2
> >          header files.
> > .. of n: Make the changes required to combine the functionality of
> >          both drivers into one. Preferably this would also be a series
> >          of patches instead of one big one.
> >
> > At each step of the series, both drivers should still compile and work.
> 
> I agree. My original thought was to also split this patch, but I just
> didn't know how to split it. This is why I designated as an RFC. I was
> really looking for feedback as this is the correct way to combine this
> driver. I was also looking for testing purpose to make sure I did not
> break anything for the s3c platform.

The problem is, it's almost impossible to see what the functional
changes are because of all the noise of the other changes.

> >
> > Also, please follow the patch style used on the linux lists.
> > 'git format-patch --cover-letter' should do most of this for you
> > automatically.
> 
> I did use --cover-letter on this patch series.
> 
> >
> > And you should probably trim the Cc list to something more reasonable.
> 
> I looked through all the commits for the dwc2 driver for the cc list. I
> also CC a bunch of the Samsung people as I figured that the biggest
> impact of the work would affect the s3c folks.

I would suggest just CCing the Samsung folks to start with, since s3c-hsotg
is a driver for their hardware. And the linux-usb and linux-samsung-soc
lists.

-- 
Paul

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