linux-kernel - [PATCH 2/3] dts: ppc: t4240rdb: add uie_unsupported property to drop warning

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Message-Id: <20200508054925.48237-2-biwen.li@oss.nxp.com>
Date:   Fri,  8 May 2020 13:49:24 +0800
From:   Biwen Li <biwen.li@....nxp.com>
To:     leoyang.li@....com, robh+dt@...nel.org, mpe@...erman.id.au,
        benh@...nel.crashing.org, a.zummo@...ertech.it,
        alexandre.belloni@...tlin.com
Cc:     devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-rtc@...r.kernel.org,
        Biwen Li <biwen.li@....com>
Subject: [PATCH 2/3] dts: ppc: t4240rdb: add uie_unsupported property to drop warning

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>;
+				// 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