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

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Date:	Thu, 30 Jan 2014 11:31:32 +0100
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
CC:	Mike Turquette <mturquette@...aro.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, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] clk: mvebu: fix clk init order

On 01/30/14 11:24, Gregory CLEMENT wrote:
> On 25/01/2014 19:19, 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.
>
> Can you explain what kind of issue do you observe?

Sure. When probing CLK_OF_DECLAREed clock drivers, clock-gating driver
gets registered before core-clocks. It therefore cannot resolve it's
parent clock name for tclk and all clock gates will have no parent
clock.

Usually, you'll see in some drivers (e.g. v643xx_eth) div_by_zero errors
poping up, when they calculate a frequency division factors based on
clock gate frequency, which should have been tclk but is 0 now.

> I have just tested the master branch of Linus and (excepted for SATA
> but Andrew will send a patch set soon), I didn't experiment any
> issues on Armada 370 and Armada XP based boards.

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