linux-kernel - Re: [PATCH 3/4] ARM: Dove: Convert to DT GPIO and pinctrl

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Date:	Sun, 25 Nov 2012 10:28:45 -0500
From:	Jason Cooper <jason@...edaemon.net>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Andrew Lunn <andrew@...n.ch>,
	Russell King <linux@....linux.org.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Axel Lin <axel.lin@...ics.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/4] ARM: Dove: Convert to DT GPIO and pinctrl

On Sun, Nov 25, 2012 at 11:51:46AM +0100, Sebastian Hesselbarth wrote:
> On 11/24/2012 07:59 PM, Jason Cooper wrote:
> >On Sat, Nov 24, 2012 at 07:10:24PM +0100, Thomas Petazzoni wrote:
> >>On Sat, 24 Nov 2012 10:00:04 -0500, Jason Cooper wrote:
> >>>Yes, so that's what I thought happened.  This would have made orion/dt
> >>>depend upon mvebu/everything.  It already had two other dependencies.
> >>>Not ideal.
> >>>
> >>>The good thing is, the build is not broken.  Once v3.8-rc1 drops with
> >>>all of our stuff merged, I'll post a fixup patch adding this back in.
> >>
> >>It unfortunately means that Dove will be basically unbootable in
> >>3.8-rc1, as the driver will not be clk_get()ing its gatable clock, and
> >>the clock driver will disable it. Maybe we can just live with it, I
> >>don't know.
> >
> >Yes, I thought as much after I sent this reply.  Definitely a choice of
> >the lesser of two evils.  As long as we don't break the build or have
> >horrendous merge conflicts, I think it's tolerable.
> >
> >Any one who is booting -rc1's is typically bug hunting.  This means
> >Sebastian, who has been CC'd on all of this.  I don't want to rely on
> >this in the future, but doing it once due to the circumstances is
> >something I'm comfortable answering to.
> 
> sorry for the late answer. I merged all pull reqs in the order posted
> on top of latest linux/master. Thomas is right, removing the clk_gate
> from pinctrl potentially could have broken boot on dove. I tried it and
> it _does_ boot, because the clk used by pinctrl is optional in pinctrl-dove
> and there is no pinhog/device touching the register clocked by the clock.
> 
> As soon as I 'cat pinconf-groups' in debugfs, the register is read and
> my cubox hangs as expected.
> 
> So, finally a fixup patch for 3.8-rc1 is ok for me.

Great!  I'm glad to hear it's not as bad as I feared.

thx,

Jason.
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