linux-kernel - Re: [v2 1/2] dts: ppc: t4240rdb: remove interrupts property

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Date:   Fri, 22 May 2020 14:20:28 -0500
From:   Li Yang <leoyang.li@....com>
To:     Biwen Li <biwen.li@....nxp.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        a.zummo@...ertech.it,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        lkml <linux-kernel@...r.kernel.org>, linux-rtc@...r.kernel.org,
        Biwen Li <biwen.li@....com>
Subject: Re: [v2 1/2] dts: ppc: t4240rdb: remove interrupts property

On Wed, May 20, 2020 at 4:21 AM Biwen Li <biwen.li@....nxp.com> wrote:
>
> From: Biwen Li <biwen.li@....com>
>
> This removes interrupts 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

The commit message need a little bit improvement.  Something like:

Since the interrupt pin for RTC DS1374 is not connected to the CPU on
T4240RDB, remove
the interrupt property from the device tree.

This also fix the following warning for hwclock.util-linux:
  $ hwclock.util-linux
   hwclock.util-linux: select() to /dev/rtc0
   to wait for clock tick timed out

>
> Signed-off-by: Biwen Li <biwen.li@....com>
> ---
>  arch/powerpc/boot/dts/fsl/t4240rdb.dts | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/arch/powerpc/boot/dts/fsl/t4240rdb.dts b/arch/powerpc/boot/dts/fsl/t4240rdb.dts
> index a56a705d41f7..145896f2eef6 100644
> --- a/arch/powerpc/boot/dts/fsl/t4240rdb.dts
> +++ b/arch/powerpc/boot/dts/fsl/t4240rdb.dts
> @@ -144,7 +144,6 @@
>                         rtc@68 {
>                                 compatible = "dallas,ds1374";
>                                 reg = <0x68>;
> -                               interrupts = <0x1 0x1 0 0>;
>                         };
>                 };
>
> --
> 2.17.1
>