linux-kernel - Re: [PATCH v9 1/3] RTC: RK808: add RTC driver for RK808

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Message-ID: <20140904200843.GF10224@core.coreip.homeip.net>
Date:	Thu, 4 Sep 2014 13:08:44 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Chris Zhong <zyw@...k-chips.com>,
	Heiko Stübner <heiko@...ech.de>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Mike Turquette <mturquette@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"broonie@...nel.org" <broonie@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	rtc-linux@...glegroups.com, Grant Likely <grant.likely@...aro.org>,
	Lin Huang <hl@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>,
	zhangqing <zhangqing@...k-chips.com>, xxx <xxx@...k-chips.com>,
	Olof Johansson <olof@...om.net>,
	Sonny Rao <sonnyrao@...omium.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Kever Yang <kever.yang@...k-chips.com>
Subject: Re: [PATCH v9 1/3] RTC: RK808: add RTC driver for RK808

On Thu, Sep 04, 2014 at 12:04:11PM -0700, Doug Anderson wrote:
> Dmitry,
> 
> On Thu, Sep 4, 2014 at 10:33 AM, Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
> > On Wed, Sep 03, 2014 at 09:18:42PM -0700, Doug Anderson wrote:
> >> Chris,
> >>
> >> On Wed, Sep 3, 2014 at 6:12 PM, Chris Zhong <zyw@...k-chips.com> wrote:
> >> > Adding RTC driver for supporting RTC device present inside RK808 PMIC.
> >> >
> >> > Signed-off-by: Chris Zhong <zyw@...k-chips.com>
> >> > Signed-off-by: Zhang Qing <zhangqing@...k-chips.com>
> >> >
> >> > Tested-by: Heiko Stuebner <heiko@...ech.de>
> >>
> >> Reviewed-by: Doug Anderson <dianders@...omium.org>
> >> Tested-by: Doug Anderson <dianders@...omium.org>
> >>
> >>
> >> > +       rk808_rtc->irq = platform_get_irq(pdev, 0);
> >> > +       if (rk808_rtc->irq < 0) {
> >> > +               dev_err(&pdev->dev, "Wake up is not possible as irq = %d\n",
> >> > +                       rk808_rtc->irq);
> >>
> >> Technically you shouldn't print the error if it's -EPROBE_DEFER.
> >> ...but I think that's really unlikely here (I can't imagine any real
> >> cases where the interrupt parent for RK808 would actually be deferred)
> >> so I won't push it.
> >
> > Doug, platform_get_irq() simply iterates through IRQ resources assigned to the
> > device, which are populated at platform device creation time. The only error it
> > returns ever is -ENXIO, so we are fine here.
> 
> I think maybe you're looking at older source code?  The source code I
> have for mainline Linux specifically includes code handling
> EPROBE_DEFER in platform_get_irq().

Ah, indeed. That -EPROBE_DEFER monstrosity keeps spreading :(

-- 
Dmitry
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