linux-kernel - Re: [PATCH v3] clk: add MOXA ART SoCs clock driver

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Date:	Thu, 18 Jul 2013 12:36:40 +0200
From:	Jonas Jensen <jonas.jensen@...il.com>
To:	Mark Rutland <mark.rutland@....com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"arm@...nel.org" <arm@...nel.org>,
	"mturquette@...aro.org" <mturquette@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] clk: add MOXA ART SoCs clock driver

Hi Mark, thanks for taking a look at this.

On 18 July 2013 11:50, Mark Rutland <mark.rutland@....com> wrote:
> This confuses me. moxart_of_clk_init gets called because there was a
> "moxa,moxart-core-clock", node in the dt, but the driver only seems to
> use the information to figure out the configuration of another clock
> ("moxa,moxart-apb-clock"), and never registers a clock specifically for
> the core-clock.
>
> I couldn't find "moxa,moxart-apb-clock" described in mainline. COuld you
> describe the relationship between core-clock and apb-clock?

It's true core-clock exist only so the register can be mapped.

apb-clock is part of a patch set that will add new device tree files for the
MOXA ART SoC, but it's not in mainline:

http://lists.infradead.org/pipermail/linux-arm-kernel/2013-July/181757.html

apb-clock could be a fixed rate 48MHz DT only clock, but because we can't
be sure it's 48MHz on all platforms, reading it from a register with core-clock
is more portable.


Best regards,
Jonas
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