From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Biwen Li <biwen.li@oss.nxp.com>
Cc: leoyang.li@nxp.com, robh+dt@kernel.org, mpe@ellerman.id.au,
benh@kernel.crashing.org, a.zummo@towertech.it,
devicetree@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org,
Biwen Li <biwen.li@nxp.com>
Subject: Re: [PATCH 2/3] dts: ppc: t4240rdb: add uie_unsupported property to drop warning
Date: Fri, 8 May 2020 13:50:52 +0200 [thread overview]
Message-ID: <20200508115052.GL34497@piout.net> (raw)
In-Reply-To: <20200508054925.48237-2-biwen.li@oss.nxp.com>
On 08/05/2020 13:49:24+0800, Biwen Li wrote:
> From: Biwen Li <biwen.li@nxp.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@nxp.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
> + // 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
next prev parent reply other threads:[~2020-05-08 11:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-08 5:49 [PATCH 1/3] rtc: ds1374: add uie_unsupported property to drop warning Biwen Li
2020-05-08 5:49 ` [PATCH 2/3] dts: ppc: t4240rdb: " Biwen Li
2020-05-08 11:50 ` Alexandre Belloni [this message]
2020-05-08 11:59 ` Biwen Li (OSS)
2020-05-08 5:49 ` [PATCH 3/3] dts: ppc: t1024rdb: add wakeup-source " Biwen Li
2020-05-08 11:49 ` [PATCH 1/3] rtc: ds1374: add uie_unsupported " Alexandre Belloni
2020-05-08 11:59 ` Biwen Li (OSS)
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