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

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

[Quentin Schulz]

From: Quentin Schulz <quentin.schulz@theobroma-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@theobroma-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

Re: [PATCH] rtc: isl1208: do not advertise update interrupt feature if no interrupt specified

[Alexandre Belloni]

On Mon, 23 May 2022 16:53:20 +0200, Quentin Schulz wrote:
> From: Quentin Schulz <quentin.schulz@theobroma-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).
> 
> 
> [...]

Applied, thanks!

[1/1] rtc: isl1208: do not advertise update interrupt feature if no interrupt specified
      commit: ddc9c54b6b993bca4aa810402b17a0f42c5744d1

Best regards,

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com