gpio: ds4520: don't check the 'ngpios' property in the driver

This is already done by the gpio-regmap abstraction by calling
gpiochip_get_ngpios(). We don't need to do this at the driver level.

Signed-off-by: Bartosz Golaszewski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-ds4520.c

···
 	struct gpio_regmap_config config = { };
 	struct device *dev = &client->dev;
 	struct regmap *regmap;
-	u32 ngpio;
 	u32 base;
 	int ret;
 
 	ret = device_property_read_u32(dev, "reg", &base);
 	if (ret)
 		return dev_err_probe(dev, ret, "Missing 'reg' property.\n");
-
-	ret = device_property_read_u32(dev, "ngpios", &ngpio);
-	if (ret)
-		return dev_err_probe(dev, ret, "Missing 'ngpios' property.\n");
 
 	regmap = devm_regmap_init_i2c(client, &ds4520_regmap_config);
 	if (IS_ERR(regmap))
···
 
 	config.regmap = regmap;
 	config.parent = dev;
-	config.ngpio = ngpio;
 
 	config.reg_dat_base = base + DS4520_IO_STATUS0;
 	config.reg_set_base = base + DS4520_PULLUP0;