gpio: Use of_property_read_bool() for boolean properties

It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties.
Convert reading boolean properties to to of_property_read_bool().
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpio-stp-xway.c

@@ -292,7 +292,7 @@ static int xway_stp_probe(struct platform_device *pdev)
 	}
 
 	/* check which edge trigger we should use, default to a falling edge */
-	if (!of_find_property(pdev->dev.of_node, "lantiq,rising", NULL))
+	if (!of_property_read_bool(pdev->dev.of_node, "lantiq,rising"))
 		chip->edge = XWAY_STP_FALLING;
 
 	clk = devm_clk_get(&pdev->dev, NULL);

drivers/gpio/gpio-tb10x.c

@@ -167,7 +167,7 @@ static int tb10x_gpio_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, tb10x_gpio);
 
-	if (of_find_property(np, "interrupt-controller", NULL)) {
+	if (of_property_read_bool(np, "interrupt-controller")) {
 		struct irq_chip_generic *gc;
 
 		ret = platform_get_irq(pdev, 0);