gpiolib: of: add quirk for phy reset polarity for Freescale Ethernet

Bindings for Freescale Fast Ethernet Controller use a separate
property "phy-reset-active-high" to specify polarity of its phy
gpio line. To allow converting the driver to gpiod API we need
to add this quirk to gpiolib.
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

drivers/gpio/gpiolib-of.c

@@ -231,6 +231,33 @@ static void of_gpio_flags_quirks(const struct device_node *np,
 	    !strcmp(propname, "snps,reset-gpio") &&
 	    of_property_read_bool(np, "snps,reset-active-low"))
 		*flags |= OF_GPIO_ACTIVE_LOW;
+
+	/*
+	 * Freescale Fast Ethernet Controller uses a separate property to
+	 * describe polarity of the phy reset line.
+	 */
+	if (IS_ENABLED(CONFIG_FEC)) {
+		static const char * const fec_devices[] = {
+			"fsl,imx25-fec",
+			"fsl,imx27-fec",
+			"fsl,imx28-fec",
+			"fsl,imx6q-fec",
+			"fsl,mvf600-fec",
+			"fsl,imx6sx-fec",
+			"fsl,imx6ul-fec",
+			"fsl,imx8mq-fec",
+			"fsl,imx8qm-fec",
+			"fsl,s32v234-fec",
+			NULL
+		};
+
+		if (!strcmp(propname, "phy-reset-gpios") &&
+		    of_device_compatible_match(np, fec_devices)) {
+			bool active_high = of_property_read_bool(np,
+						"phy-reset-active-high");
+			of_gpio_quirk_polarity(np, active_high, flags);
+		}
+	}
 }
 
 /**