serial: max310x: Do not hard-code the IRQ type

As suggested by Russell King, a driver should not really care about bits
such as the interrupt polarity or whether it is edge- or level-
triggered. The reasons for that include:

- an upstream IRQ controller which cannot support edge- or
level-triggered interrupts,
- board design with a built-in inverter

The interrupt type is being already specified by the Device Tree,
anyway. Other drivers (gpio/gpio-tc3589x.c for example) already work in
this way, delegating the proper IRQ line setup to the DT and not
specifying anything by hand.

Also, there's no reason to have the IRQ flags split between two places.
The SPI probing is the only entry point anyway.

Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/max310x.c

@@ -1089,7 +1089,7 @@ static int max310x_gpio_direction_output(struct gpio_chip *chip,
 #endif
 
 static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
-			 struct regmap *regmap, int irq, unsigned long flags)
+			 struct regmap *regmap, int irq)
 {
 	int i, ret, fmin, fmax, freq, uartclk;
 	struct clk *clk_osc, *clk_xtal;
@@ -1239,7 +1239,7 @@ static int max310x_probe(struct device *dev, struct max310x_devtype *devtype,
 
 	/* Setup interrupt */
 	ret = devm_request_threaded_irq(dev, irq, NULL, max310x_ist,
-					IRQF_ONESHOT | flags, dev_name(dev), s);
+					IRQF_ONESHOT, dev_name(dev), s);
 	if (!ret)
 		return 0;
 
@@ -1304,7 +1304,6 @@ static struct regmap_config regcfg = {
 static int max310x_spi_probe(struct spi_device *spi)
 {
 	struct max310x_devtype *devtype;
-	unsigned long flags = 0;
 	struct regmap *regmap;
 	int ret;
 
@@ -1327,11 +1326,10 @@ static int max310x_spi_probe(struct spi_device *spi)
 		devtype = (struct max310x_devtype *)id_entry->driver_data;
 	}
 
-	flags = IRQF_TRIGGER_FALLING;
 	regcfg.max_register = devtype->nr * 0x20 - 1;
 	regmap = devm_regmap_init_spi(spi, &regcfg);
 
-	return max310x_probe(&spi->dev, devtype, regmap, spi->irq, flags);
+	return max310x_probe(&spi->dev, devtype, regmap, spi->irq);
 }
 
 static int max310x_spi_remove(struct spi_device *spi)