[PATCH v6 02/17] rtc: rzn1: Handle EPROBE_DEFER for optional pps interrupt

[Prabhakar]

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>

Check for -EPROBE_DEFER from platform_get_irq_byname_optional() and handle
the deferred probe request properly.

Although the "pps" interrupt is optional, an error code of -EPROBE_DEFER
indicates that the interrupt subsystem is not yet ready. Intercept this
specific error condition, assign it to the return value, and jump to the
dis_runtime_pm label to avoid ignoring a valid probe deferral.

Fixes: eea7791e00f33 ("rtc: rzn1: implement one-second accuracy for alarms")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Reviewed-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
Tested-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
---
v5->v6:
- No changes.

v4->v5:
- Added Tested-by tag from Wolfram.

v3->v4:
- Added Reviewed-by tag from Wolfram.

v2->v3:
- No changes

v1->v2:
- No changes
---
 drivers/rtc/rtc-rzn1.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/rtc/rtc-rzn1.c b/drivers/rtc/rtc-rzn1.c
index c4ed43735457..f81d691c8b9a 100644
--- a/drivers/rtc/rtc-rzn1.c
+++ b/drivers/rtc/rtc-rzn1.c
@@ -465,6 +465,10 @@ static int rzn1_rtc_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq_byname_optional(pdev, "pps");
+	if (irq == -EPROBE_DEFER) {
+		ret = irq;
+		goto dis_runtime_pm;
+	}
 	if (irq >= 0)
 		ret = devm_request_irq(&pdev->dev, irq, rzn1_rtc_1s_irq, 0, "RZN1 RTC 1s", rtc);
 
-- 
2.43.0