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:

quoted

From: Biwen Li <redacted>

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 <redacted>
---
 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

quoted

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.

quoted

+				// 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