linux-kernel - Re: [PATCH v2 1/4] clk: mediatek: mt8173: Fix enabling of critical clocks

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Message-ID: <559B06C7.80209@codeaurora.org>
Date:	Mon, 06 Jul 2015 15:52:55 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Daniel Kurtz <djkurtz@...omium.org>
CC:	James Liao <jamesjj.liao@...iatek.com>,
	Mike Turquette <mturquette@...aro.org>,
	srv_heupstream <srv_heupstream@...iatek.com>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ricky Liang <jcliang@...omium.org>,
	Rob Herring <robh+dt@...nel.org>,
	linux-mediatek@...ts.infradead.org,
	Sascha Hauer <kernel@...gutronix.de>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 1/4] clk: mediatek: mt8173: Fix enabling of critical
 clocks

On 07/02/2015 11:29 PM, Daniel Kurtz wrote:
> Hi Stephen,
>
> On Fri, Jul 3, 2015 at 7:03 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:
>> On 06/30, James Liao wrote:
>>> From: Sascha Hauer <s.hauer@...gutronix.de>
>>>
>>> On the MT8173 the clocks are provided by different units. To enable
>>> the critical clocks we must be sure that all parent clocks are already
>>> registered, otherwise the parents of the critical clocks end up being
>>> unused and get disabled later. To find a place where all parents are
>>> registered we try each time after we've registered some clocks if
>>> all known providers are present now and only then we enable the critical
>>> clocks
>>>
>>> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
>>> Signed-off-by: James Liao <jamesjj.liao@...iatek.com>
>>> ---
>> Applied to clk-fixes
> I think James plans to send an updated version of this patch.
>
>

Oh right. Well those comments are minor so I'll just fold them in given
that I'm rewinding clk-fixes today. I see that comment in init.h about
uninitialized variables and __initdata too. I found this 10 year old
thread about that [1]. At least with my gcc-4.9 arm compiler I don't see
uninitialized __initdata moved to bss. A workaround seems to be to
initialize it to NULL in this case, but maybe that doesn't matter
because compilers don't have that problem anymore.

[1] http://lkml.iu.edu/hypermail/linux/kernel/0512.0/1366.html

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Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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