linux-kernel - Re: [PATCH 2/2] Changes to existing files for 0PF FPGA board.

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Date:	Sat, 20 Jun 2015 10:00:37 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Rob Landley <rob@...dley.net>
Cc:	Jiri Slaby <jslaby@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Kevin Hilman <khilman@...aro.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Riku Voipio <riku.voipio@...aro.org>,
	Jiri Kosina <jkosina@...e.cz>, Paul Bolle <pebolle@...cali.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Davidlohr Bueso <davidlohr@...com>,
	Richard Weinberger <richard@....at>,
	Zhigang Lu <zlu@...era.com>,
	Vineet Gupta <vgupta@...opsys.com>,
	Richard Kuo <rkuo@...eaurora.org>,
	Max Filippov <jcmvbkbc@...il.com>,
	Pranith Kumar <bobby.prani@...il.com>,
	Linux-sh list <linux-sh@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH 2/2] Changes to existing files for 0PF FPGA board.

Hi Rob,

On Sat, Jun 20, 2015 at 12:11 AM, Rob Landley <rob@...dley.net> wrote:
> On 06/18/2015 02:36 PM, Geert Uytterhoeven wrote:
>> On Thu, Jun 18, 2015 at 7:19 PM, Rob Landley <rob@...dley.net> wrote:
>>> Changes to existing files to add 0pf j2 board support.
>>
>> Thanks for your patch!
>>
>> Like Greg already said, splitting it up in logical parts and providing useful
>> patch descriptions would be highly appreciated.
>
> I actually don't know how to split it up further. The initial port was
> done by a series of contractors (in Russia, I think), and then I
> inherited it to try to get something releasable. This is the smallest
> chunk I could get to actually boot.
>
> I suppose I could send you the serial driver by itself, and _then_ the
> board, but it wouldn't compile if nothing uses it. (Similarly you can't
> boot the board without a serial console...)

You don't have to send in a big initial patch that actually boots.
For new architecture/SoC/board support, just split it in logical hunks,
and submit it in some logical order that always builds.

E.g.:
  - SoC core support (arch/sh/),
  - Board support (arch/sh/),
  - Drivers.

The first two should go in through akpm (sh is orphaned),
the rest through the individual subsystem maintainers.

> (Now the reason _I_ thought you'd reject it had more to do with not
> having converted it to device tree yet, and things on that level. But I

Sh is an existing supported architecture, so DT is not a hard requirement.
If you would have waited until after the removal of sh, it would be much
harder :-) (cfr. h8300, but Sato-san did a great job there, with DT, CCF, ...)

> wanted to get it out there so people outside $DAYJOB can test the
> hardware. We did a linuxcon japan presentation which lwn.net covered,
> and we're getting pokes about "where can I download this", so...)

It's great to hear there's so much interest in this! Let's hope this will
attract more actual contributors...

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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