linux-kernel - Re: [PATCH] clk: respect the clock dependencies in of_clk

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Date:	Thu, 06 Feb 2014 00:11:39 +0100
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Mike Turquette <mturquette@...aro.org>
CC:	linux-kernel@...r.kernel.org, Jason Cooper <jason@...edaemon.net>,
	Andrew Lunn <andrew@...n.ch>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: respect the clock dependencies in of_clk_init

On 02/04/2014 11:59 PM, Gregory CLEMENT wrote:
> Until now the clock providers were initialized in the order found in
> the device tree. This led to have the dependencies between the clocks
> not respected: children clocks could be initialized before their
> parent clocks.
>
> Instead of forcing each platform to manage its own initialization order,
> this patch adds this work inside the framework itself.
>
> Using the data of the device tree the of_clk_init function now delayed
> the initialization of a clock provider if its parent provider was not
> ready yet.
>
> Signed-off-by: Gregory CLEMENT <gregory.clement@...e-electrons.com>
> [...]
> this patch could solve the issues we get on severals mvebu platform
> since 3.14-rc1. This is an alternate solution of the patch set sent by
> Sebastian. However as it modifies the clock framework itself, it is
> more sensible.
>
> I find this solution more elegant than changing the order of the
> initialization of the clock at the platform level. However as it
> should be tested on more platforms that only the mvebu ones, it would
> take some time, and I don't want to still have "broken" platform
> during more release candidate. So at the end this patch should be part
> of the 3.15 kernel.

Gregory,

I admit, your patch is more general and I am looking forward to revert
the reorder fix as soon as this is ready :)

BTW, what happened to the early device discussion? Couldn't this be
picked up here to allow -EPROBE_DEFER also for those early drivers?

Sebastian
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