gpio: exar: Use correct property prefix and document bindings

The device-specific property should be prefixed with the vendor name,
not "linux,", as Linus Walleij pointed out. Change this and document the
bindings of this platform device.

We didn't ship the old binding in a release yet. So we can still change
it without breaking an official API.

Fixes: 380b1e2f3a ("gpio-exar/8250-exar: Make set of exported GPIOs configurable")
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/gpio/gpio-exar.txt

@@ -0,0 +1,5 @@
+Exportable MPIO interface of Exar UART chips
+
+Required properties of the device:
+ - exar,first-pin: first exportable pins (0..15)
+ - ngpios: number of exportable pins (1..16)

drivers/gpio/gpio-exar.c

@@ -132,7 +132,7 @@ static int gpio_exar_probe(struct platform_device *pdev)
 	if (!p)
 		return -ENOMEM;
 
-	ret = device_property_read_u32(&pdev->dev, "linux,first-pin",
+	ret = device_property_read_u32(&pdev->dev, "exar,first-pin",
 				       &first_pin);
 	if (ret)
 		return ret;

drivers/tty/serial/8250/8250_exar.c

@@ -261,7 +261,7 @@ __xr17v35x_register_gpio(struct pci_dev *pcidev,
 }
 
 static const struct property_entry exar_gpio_properties[] = {
-	PROPERTY_ENTRY_U32("linux,first-pin", 0),
+	PROPERTY_ENTRY_U32("exar,first-pin", 0),
 	PROPERTY_ENTRY_U32("ngpios", 16),
 	{ }
 };
@@ -326,7 +326,7 @@ static int iot2040_rs485_config(struct uart_port *port,
 }
 
 static const struct property_entry iot2040_gpio_properties[] = {
-	PROPERTY_ENTRY_U32("linux,first-pin", 10),
+	PROPERTY_ENTRY_U32("exar,first-pin", 10),
 	PROPERTY_ENTRY_U32("ngpios", 1),
 	{ }
 };