Re: [PATCH v10 0/9] Add the I3C subsystem - Greg Kroah-Hartman

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Boris Brezillon <boris.brezillon@bootlin.com>
Cc: Wolfram Sang <wsa@the-dreams.de>,
	linux-i2c@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
	linux-doc@vger.kernel.org, Arnd Bergmann <arnd@arndb.de>,
	Przemyslaw Sroka <psroka@cadence.com>,
	Arkadiusz Golec <agolec@cadence.com>,
	Alan Douglas <adouglas@cadence.com>,
	Bartosz Folta <bfolta@cadence.com>, Damian Kos <dkos@cadence.com>,
	Alicja Jurasik-Urbaniak <alicja@cadence.com>,
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	Suresh Punnoose <sureshp@cadence.com>,
	Rafal Ciepiela <rafalc@cadence.com>,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Nishanth Menon <nm@ti.com>, Rob Herring <robh+dt@kernel.org>,
	Pawel Moll <pawel.moll@arm.com>,
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	Ian Campbell <ijc+devicetree@hellion.org.uk>,
	Kumar Gala <galak@codeaurora.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Vitor Soares <Vitor.Soares@synopsys.com>,
	Geert Uytterhoeven <geert@linux-m68k.org>,
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	Xiang Lin <Xiang.Lin@synaptics.com>,
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	Przemyslaw Gaj <pgaj@cadence.com>, Peter Rosin <peda@axentia.se>,
	Mike Shettel <mshettel@codeaurora.org>,
	Stephen Boyd <swboyd@chromium.org>,
	Stephen Rothwell <sfr@canb.auug.org.au>
Subject: Re: [PATCH v10 0/9] Add the I3C subsystem
Date: Sun, 11 Nov 2018 12:59:02 -0800	[thread overview]
Message-ID: <20181111205902.GA21546@kroah.com> (raw)
In-Reply-To: <20181111205718.GA16288@kroah.com>

On Sun, Nov 11, 2018 at 12:57:18PM -0800, Greg Kroah-Hartman wrote:
> On Sun, Nov 11, 2018 at 09:08:18PM +0100, Boris Brezillon wrote:
> > On Sun, 11 Nov 2018 11:10:20 -0800
> > Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
> > 
> > > On Sun, Nov 11, 2018 at 07:10:17PM +0100, Boris Brezillon wrote:
> > > > Hi Greg,
> > > > 
> > > > On Sun, 11 Nov 2018 09:39:32 -0800
> > > > Greg Kroah-Hartman <gregkh@linuxfoundation.org> wrote:
> > > >   
> > > > > On Fri, Oct 26, 2018 at 04:43:24PM +0200, Boris Brezillon wrote:  
> > > > > > Hi Greg,
> > > > > > 
> > > > > > I think we've reached a point where we can eventually consider the I3C
> > > > > > framework for inclusion in 4.20 (5.0?). A few more issues were reported
> > > > > > on v9 and fixed in v10. I can't guarantee that the implementation is
> > > > > > free of bugs but I still think it's worth merging it in v4.20: it's a
> > > > > > new subsystem, so we don't risk regressions, and the only way we can
> > > > > > detect other issues is by having other people experiment with this
> > > > > > implementation.
> > > > > > 
> > > > > > The only remaining concern raised by Arnd is the fact that both hosts
> > > > > > and slaves share the same bus type and are differentiated thanks to
> > > > > > their device_type, which IMHO is fine since this is what other
> > > > > > subsystems do (plus I don't see other solutions to have both I3C
> > > > > > devices and I3C buses represented under /sys/bus/i3c/).    
> > > > > 
> > > > > Yeah, it's not the nicest, but it will work, we did it also for USB and
> > > > > greybus and it solves the issue.
> > > > > 
> > > > > This all looks good to me, so I've queued it up.  Let's see if
> > > > > linux-next has any problems with it.  
> > > > 
> > > > I recently asked Stephen to add the linux-i3c tree to linux-next, so
> > > > I'm expecting conflicts :-/. Sorry, I didn't know you were planning to
> > > > take these patches through your tree.
> > > > 
> > > > BTW, I also fixed a couple of things when rebasing on top of 4.20-rc1:
> > > > 
> > > > - KernelVersion in the sysfs ABI doc has been updated to 5.0  
> > > 
> > > There is no 5.0 yet :)
> > 
> > Actually I had a hard time choosing between 4.21 and 5.0, and then I
> > saw Linus' email announcing 4.20-rc1 ;-). But I can change it back to
> > 4.21 if you prefer.
> > 
> > > 
> > > > - Fixed i3c_master_getmxds_locked() (bug reported/fixed by Colin here
> > > >   https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1799850.html)
> > > > - Removed a blank line at the end of master-driver-api.rst
> > 
> > One extra thing I didn't mention (and didn't fix yet) is the I3C
> > mailing list. I asked Dave Miller if he'd be okay to create the
> > linux-i3c ML on vger.kernel.org, and he suggested that we use the
> > linux-i2c ML instead which I know Wolfram is not fond of. I might
> > decide to just put linux-kernel@vger.kernel.org as the ML to Cc for
> > I3C patches until we settle on something. 
> > 
> > > > 
> > > > For the record, the i3c/next branch pulled by Stephen is available here
> > > > [1].
> > > >   
> > > > > Thanks for sticking with it, nice work!  
> > > > 
> > > > Thanks for reviewing it! Greg, Stephen, let me know if you want me to
> > > > reset i3c/next to v4.20-rc1 to avoid conflicts in linux-next.  
> > > 
> > > So do you want me to just drop these patches from my tree?  If so, I
> > > can, but i have no problem sending these to Linus for the next -rc1
> > > merge window through my tree if that is easier.
> > > 
> > > It's up to you.
> > 
> > I think that's easier for me and for you if I take them in the i3c tree
> > and then send a PR to Linus myself. This way I won't bother you if
> > fixes are needed or if I decide to apply patches adding support for
> > other I3C controllers (I see you commented on the Synopsys driver
> > already, and I might indeed decide to queue this patchset for this
> > release).
> > 
> > Doing that also allows me to get everything in place since I'll anyway
> > have to send PRs to Linus at some point.
> > 
> > Regards,
> > 
> > Boris
> > 
> > PS: If you're fine with me taking the I3C patches, I'll need your
> > Acked-by.
> 
> Sure, feel free to do it all yourself, I do not object to that!  :)
> 
> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

And I've now dropped all of these patches from my tree, so no need to
worry about any conflicts.

thanks,

greg k-h