linux-kernel - Re: [PATCH] clk: rockchip: add initcall to set clk defaults after syscons are available

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Date:	Wed, 24 Sep 2014 13:21:57 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Heiko Stübner <heiko@...ech.de>
Cc:	Mike Turquette <mturquette@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] clk: rockchip: add initcall to set clk defaults after
 syscons are available

Hi,

On Thu, Aug 7, 2014 at 5:57 AM, Heiko Stübner <heiko@...ech.de> wrote:
> PLLs on Rockchip platforms report their locking state in an external
> register situated in the "General Register Files" which is provided
> through a syscon device.
>
> When the initial clk init runs, this syscon is of course not yet
> available, making it impossible to set PLLs to other frequencies
> through the assigned-rate property of the clock-controller node.
>
> Syscon devices are initialized through a postcore initcall, so add an
> arch_initcall to rerun the rockchip specific clock initalization when
> the GRF is available.
>
> As the clock init already runs two times (through of_clk_add_provider
> and of_clk_init), a third time shouldn't hurt to much and in the best
> case wouldn't change any settings at all.
>
> Signed-off-by: Heiko Stuebner <heiko@...ech.de>
> ---
>  drivers/clk/rockchip/clk.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)

My current understanding is that this patch is on hold pending
<https://patchwork.kernel.org/patch/4945531/> (AKA mfd: syscon:
Decouple syscon interface from platform devices).  If that patch lands
then we can drop this one.

-Doug
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