USB: serial: ftdi_sio: fix gpio name collisions

Drop the gpio line names, which cause gpiolib to complain loudly
whenever a second ftdi gpiochip is registered:

gpio gpiochip5: Detected name collision for GPIO name 'CBUS0'
gpio gpiochip5: Detected name collision for GPIO name 'CBUS1'
gpio gpiochip5: Detected name collision for GPIO name 'CBUS2'
gpio gpiochip5: Detected name collision for GPIO name 'CBUS3'

and also prevents the legacy sysfs interface from being used (as the
line names are used as device names whenever they are set):

sysfs: cannot create duplicate filename '/class/gpio/CBUS0'

Until non-unique names are supported by gpiolib (without warnings and
stack dumps), let's leave the gpio lines unnamed.

Signed-off-by: Johan Hovold <[e-mail]>

drivers/usb/serial/ftdi_sio.c

···
 
 #ifdef CONFIG_GPIOLIB
 
-static const char * const ftdi_ftx_gpio_names[] = {
-	"CBUS0", "CBUS1", "CBUS2", "CBUS3"
-};
-
 static int ftdi_set_bitmode(struct usb_serial_port *port, u8 mode)
 {
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
···
 
 	/* FIXME: FT234XD alone has 1 GPIO, but how to recognize this IC? */
 	priv->gc.ngpio = 4;
-	priv->gc.names = ftdi_ftx_gpio_names;
 
 	/* Determine which pins are configured for CBUS bitbanging */
 	priv->gpio_altfunc = 0xff;