linux-kernel - [PATCH 1/3] rtc: ds1374: add uie_unsupported property to drop warning

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Date:   Fri,  8 May 2020 13:49:23 +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 1/3] rtc: ds1374: add uie_unsupported property to drop warning

From: Biwen Li <biwen.li@....com>

Add uie_unsupported property to drop warning as follows:
    - $ hwclock.util-linux
      hwclock.util-liux: select() /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>
---
 drivers/rtc/rtc-ds1374.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rtc/rtc-ds1374.c b/drivers/rtc/rtc-ds1374.c
index 9c51a12cf70f..e530e887a17e 100644
--- a/drivers/rtc/rtc-ds1374.c
+++ b/drivers/rtc/rtc-ds1374.c
@@ -651,6 +651,10 @@ static int ds1374_probe(struct i2c_client *client,
 	if (ret)
 		return ret;
 
+	if (of_property_read_bool(client->dev.of_node,
+						 "uie_unsupported"))
+		ds1374->rtc->uie_unsupported = true;
+
 #ifdef CONFIG_RTC_DRV_DS1374_WDT
 	save_client = client;
 	ret = misc_register(&ds1374_miscdev);
-- 
2.17.1