gpio: Slightly more helpful debugfs

This at least makes debugfs print if the line is active
high or low. That is pretty helpful as what we display
as "lo" or "hi" is the raw physical level of the line.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpiolib.c

@@ -4584,8 +4584,9 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
 	struct gpio_chip	*chip = gdev->chip;
 	unsigned		gpio = gdev->base;
 	struct gpio_desc	*gdesc = &gdev->descs[0];
-	int			is_out;
-	int			is_irq;
+	bool			is_out;
+	bool			is_irq;
+	bool			active_low;
 
 	for (i = 0; i < gdev->ngpio; i++, gpio++, gdesc++) {
 		if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) {
@@ -4599,11 +4600,13 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_device *gdev)
 		gpiod_get_direction(gdesc);
 		is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
 		is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
-		seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s",
+		active_low = test_bit(FLAG_ACTIVE_LOW, &gdesc->flags);
+		seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s%s",
 			gpio, gdesc->name ? gdesc->name : "", gdesc->label,
 			is_out ? "out" : "in ",
 			chip->get ? (chip->get(chip, i) ? "hi" : "lo") : "?  ",
-			is_irq ? "IRQ" : "   ");
+			is_irq ? "IRQ " : "",
+			active_low ? "ACTIVE LOW" : "");
 		seq_printf(s, "\n");
 	}
 }