rtc: pcf2123: use IRQ flags obtained from fwnode

Allow the IRQ type to be passed from the device tree if available as there
may be components changing the trigger type of the interrupt between the
RTC and the IRQ controller.

Link: https://lore.kernel.org/r/20230123200217.1236011-5-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-pcf2123.c

@@ -413,9 +413,14 @@ static int pcf2123_probe(struct spi_device *spi)
 
 	/* Register alarm irq */
 	if (spi->irq > 0) {
+		unsigned long irqflags = IRQF_TRIGGER_LOW;
+
+		if (dev_fwnode(&spi->dev))
+			irqflags = 0;
+
 		ret = devm_request_threaded_irq(&spi->dev, spi->irq, NULL,
 				pcf2123_rtc_irq,
-				IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+				irqflags | IRQF_ONESHOT,
 				pcf2123_driver.driver.name, &spi->dev);
 		if (!ret)
 			device_init_wakeup(&spi->dev, true);