linux-kernel - Re: [PATCHv3 4/5] rtc: s3c: Add support for RTC of Exynos3250 SoC

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Date:	Wed, 17 Sep 2014 10:39:39 +0200
From:	Javier Martinez Canillas <javier@...hile0.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Daniel Drake <drake@...lessm.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	rtc-linux@...glegroups.com,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCHv3 4/5] rtc: s3c: Add support for RTC of Exynos3250 SoC

Hello Doug,

On Wed, Sep 17, 2014 at 12:15 AM, Doug Anderson <dianders@...omium.org> wrote:
>
> I think you can turn off CONFIG_COMMON_CLK_MAX77686 and then this
> clock will be left at whatever the bootloader set it to, right?  Then
> there will be no auto-disabling by the CCF and the RTC will work.

Yes, that's how Daniel was working around the issue.

> That's one argument for making the clock "optional".
>

Indeed.

> NOTE: I don't think that the builtin RTC is terribly important for any
> exynos-based Chromebooks that I'm aware of.  We rely on the RTC that's
> part of the Maxim PMIC itself and pretty much ignore the one built-in
> to the exynos.  I think there are some cases it was used (as a
> fallback wakeup source in certain test scripts), but nothing very
> important.
>

Ok, I'll post the patch I shared before that makes the rtc to claim
the max77802 32kHz clock as "rtc_src" anyways since that is the right
thing to do even if the "rtc_src" ends being optional due DT backward
compat.

> -Doug

Best regards,
Javier
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