linux-kernel - Re: [PATCH v1 0/2] x86/init: extend quirk use

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Date:	Wed, 13 Apr 2016 00:30:12 +0200
From:	"Luis R. Rodriguez" <mcgrof@...nel.org>
To:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	George Dunlap <george.dunlap@...rix.com>,
	Julien Grall <julien.grall@...aro.org>
Cc:	"Luis R. Rodriguez" <mcgrof@...nel.org>, bp@...en8.de,
	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	rusty@...tcorp.com.au, x86@...nel.org,
	linux-kernel@...r.kernel.org, luto@...capital.net,
	boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
	konrad.wilk@...cle.com, xen-devel@...ts.xensource.com,
	lguest@...ts.ozlabs.org, andriy.shevchenko@...ux.intel.com,
	jlee@...e.com, glin@...e.com, matt@...eblueprint.co.uk,
	andrew.cooper3@...rix.com, rjw@...ysocki.net, lenb@...nel.org,
	robert.moore@...el.com, lv.zheng@...el.com, toshi.kani@...com,
	linux-acpi@...r.kernel.org, kozerkov@...allels.com,
	josh@...htriplett.org, joro@...tes.org, tiwai@...e.de,
	sathyanarayanan.kuppuswamy@...ux.intel.com, alan@...ux.intel.com,
	rui.zhang@...el.com, mbizon@...ebox.fr, ffainelli@...ebox.fr
Subject: Re: [PATCH v1 0/2] x86/init: extend quirk use

On Mon, Apr 11, 2016 at 09:31:54AM +0200, Sebastian Andrzej Siewior wrote:
> On 04/09/2016 02:22 AM, Luis R. Rodriguez wrote:
> > What seems a bit odd is CE4100 leaves RTC enabled, can someone
> > confirm if indeed it really needs it, or can it also disable it
> > as with Xen, lguest, and Intel MID ?
> 
> So what you do with "x86_platform.legacy.rtc" is to skip
> add_rtc_cmos().

Yeap.

> For ce4100 I added of_have_populated_dt() to skip the probe.

Ah look at that.. x86 using device tree. Wasn't aware.

> If you plan to add this to CE4100 you could remove the
> "of_have_populated_dt()". It was meant to skip the RTC probe on all OF
> platforms but as of now, CE4100 is the only.

Indeed, this would clean up the add_rtc_cmos() path more and make
the semantics required for this a platform specific quirk which can
instead more easily be set by the platform on the generic:

	x86_early_init_platform_quirks()

Will go a head and remove this hack as part of the CE4100 patch, and
also add CE4100 to the list of subarchs that need the RTC quirk.

  Luis