sh-pfc: Make function GPIOs support optional

The target is to get rid of function GPIOs completely. To reach this,
make function GPIOs support optional by skipping the function GPIO chip
registration if no function GPIOS are defined in SoC data.
Signed-off-by: NLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NSimon Horman <horms+renesas@verge.net.au>

drivers/pinctrl/sh-pfc/gpio.c

@@ -384,6 +384,9 @@ int sh_pfc_register_gpiochip(struct sh_pfc *pfc)
 	}
 
 	/* Register the function GPIOs chip. */
+	if (pfc->info->nr_func_gpios == 0)
+		return 0;
+
 	chip = sh_pfc_add_gpiochip(pfc, gpio_function_setup);
 	if (IS_ERR(chip))
 		return PTR_ERR(chip);