linux-kernel - RE: [PATCH 2/3] dts: ppc: t4240rdb: add uie

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Message-ID: <DB6PR0401MB2438A53873ABE34EFA0BB9498FA20@DB6PR0401MB2438.eurprd04.prod.outlook.com>
Date:   Fri, 8 May 2020 11:59:43 +0000
From:   "Biwen Li (OSS)" <biwen.li@....nxp.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "Biwen Li (OSS)" <biwen.li@....nxp.com>
CC:     Leo Li <leoyang.li@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>
Subject: RE: [PATCH 2/3] dts: ppc: t4240rdb: add uie_unsupported property to
 drop warning

> 
> On 08/05/2020 13:49:24+0800, Biwen Li wrote:
> > From: Biwen Li <biwen.li@....com>
> >
> > This adds uie_unsupported property to drop warning as follows:
> >     - $ hwclock.util-linux
> >       hwclock.util-linux: select() to /dev/rtc0
> >       to wait for clock tick timed out
> >
> > My case:
> >     - RTC ds1374's INT pin is connected to VCC on T4240RDB,
> >       then the RTC cannot inform cpu about the alarm interrupt
> >
> > Signed-off-by: Biwen Li <biwen.li@....com>
> > ---
> >  arch/powerpc/boot/dts/fsl/t4240rdb.dts | 6 +++++-
> >  1 file changed, 5 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/powerpc/boot/dts/fsl/t4240rdb.dts
> b/arch/powerpc/boot/dts/fsl/t4240rdb.dts
> > index a56a705d41f7..ccdd10202e56 100644
> > --- a/arch/powerpc/boot/dts/fsl/t4240rdb.dts
> > +++ b/arch/powerpc/boot/dts/fsl/t4240rdb.dts
> > @@ -144,7 +144,11 @@
> >  			rtc@68 {
> >  				compatible = "dallas,ds1374";
> >  				reg = <0x68>;
> > -				interrupts = <0x1 0x1 0 0>;
> 
> removing the interrupt should be enough to solve your issue
Okay, got it. Thanks.
> 
> > +				// The ds1374's INT pin isn't
> > +				// connected to cpu's INT pin,
> > +				// so the rtc cannot synchronize
> > +				// clock tick per second.
> > +				uie_unsupported;
> >  			};
> >  		};
> >
> > --
> > 2.17.1
> >
> 
> --
> Alexandre Belloni, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com