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

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Message-ID: <20140206170838.GB12542@localhost>
Date:	Thu, 6 Feb 2014 14:08:39 -0300
From:	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
To:	Jason Cooper <jason@...edaemon.net>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	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.
> 

FWIW, Tested-by: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>

Observed "division by zero" get fixed by this, on A370 Mirabox, Kirkwood
Topkick and Dove Cubox.
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com
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