linux-kernel - [PATCH] rtc: isl1208: do not advertise update interrupt feature if no interrupt specified

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Date:   Mon, 23 May 2022 16:53:20 +0200
From:   Quentin Schulz <foss+kernel@...il.net>
To:     unlisted-recipients:; (no To-header on input)
Cc:     a.zummo@...ertech.it, alexandre.belloni@...tlin.com,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
        foss+kernel@...il.net,
        Quentin Schulz <quentin.schulz@...obroma-systems.com>
Subject: [PATCH] rtc: isl1208: do not advertise update interrupt feature if no interrupt specified

From: Quentin Schulz <quentin.schulz@...obroma-systems.com>

If an ISL1208 device does not have an interrupt line routed, the feature
shouldn't be advertised (it is by default in rtc core) or it'll confuse
userspace requesting that feature (such as hwclock from util-linux).

Signed-off-by: Quentin Schulz <quentin.schulz@...obroma-systems.com>
---
 drivers/rtc/rtc-isl1208.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 182dfa6055155..f448a525333e1 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -880,10 +880,14 @@ isl1208_probe(struct i2c_client *client, const struct i2c_device_id *id)
 	if (rc)
 		return rc;
 
-	if (client->irq > 0)
+	if (client->irq > 0) {
 		rc = isl1208_setup_irq(client, client->irq);
-	if (rc)
-		return rc;
+		if (rc)
+			return rc;
+
+	} else {
+		clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, isl1208->rtc->features);
+	}
 
 	if (evdet_irq > 0 && evdet_irq != client->irq)
 		rc = isl1208_setup_irq(client, evdet_irq);
-- 
2.36.1