On 08/05/2020 13:49:24+0800, Biwen Li wrote:
> From: Biwen Li <biwen.li@xxxxxxx>
>
> 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@xxxxxxx>
> ---
> 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
