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

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Date:	Sun, 25 Nov 2012 11:51:46 +0100
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Jason Cooper <jason@...edaemon.net>
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 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.

Jason,

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.

Thanks for merging all the patches!

Sebastian


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