linux-kernel - Re: [PATCH 0/4] clk: mvebu: fix clk init order

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Date:	Mon, 17 Feb 2014 11:13:37 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	Jason Cooper <jason@...edaemon.net>,
	Emilio López <emilio@...pez.com.ar>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Mike Turquette <mturquette@...aro.org>,
	linux-kernel@...r.kernel.org,
	Gregory Clement <gregory.clement@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/4] clk: mvebu: fix clk init order

On Wed, Feb 05, 2014 at 01:34:57PM -0500, Jason Cooper wrote:
> On Sat, Jan 25, 2014 at 07:19:06PM +0100, Sebastian Hesselbarth wrote:
> > This patch set fixes clk init order that went upside-down with
> > v3.14. I haven't really investigated what caused this, but I assume
> > it is related with DT node reordering by addresses.
> > 
> > Anyway, with v3.14 for MVEBU SoCs, the clock gating driver gets
> > registered before core clocks driver. Unfortunately, we cannot
> > return -EPROBE_DEFER in drivers initialized by clk_of_init. As the
> > init order for our drivers is always core clocks before clock gating,
> > we maintain init order ourselves by hooking CLK_OF_DECLARE to one
> > init function that will register core clocks before clock gating
> > driver.
> > 
> > This patch is based on pre-v3.14-rc1 mainline and should go in as
> > fixes for it. As we now send MVEBU clk pull-requests to Mike directly,
> > I suggest Jason picks it up as a topic branch.
> > 
> > The patches have been boot tested on Dove and compile-tested only
> > for Kirkwood, Armada 370 and XP.
> > 
> > Sebastian Hesselbarth (4):
> >   clk: mvebu: armada-370: maintain clock init order
> >   clk: mvebu: armada-xp: maintain clock init order
> >   clk: mvebu: dove: maintain clock init order
> >   clk: mvebu: kirkwood: maintain clock init order
> > 
> >  drivers/clk/mvebu/armada-370.c | 21 ++++++++++-----------
> >  drivers/clk/mvebu/armada-xp.c  | 20 +++++++++-----------
> >  drivers/clk/mvebu/dove.c       | 19 +++++++++----------
> >  drivers/clk/mvebu/kirkwood.c   | 34 ++++++++++++++++------------------
> >  4 files changed, 44 insertions(+), 50 deletions(-)
> 
> Whole series applied to mvebu/clk-fixes.
> 

Are we still in time to consider Emilio's oneline proposal?
(Emilio: would you mind preparing a suitable patch against dove,
kirkwood, armada370/xp, so we can see the real thing?).

Sebastian fix works perfect, and it easy to understand. However, it has
quite a large diffstat. When compared to Emilio's oneline proposal, it
seems to me it would be preferable, unless it's broken.

Workaround or not, the fact is this code will be in v3.14, so maybe we
can spend some time considering a cleaner option.

Or is this just rubbish?
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
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