gpio: omap: improve coding style for pin config flags

Change the handling of pin config flags from if/else to switch
statement to make the code more readable and cleaner.
Suggested-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Drew Fustini <drew@beagleboard.org>
Acked-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200722120755.230741-1-drew@beagleboard.orgSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-omap.c

@@ -899,13 +899,18 @@ static int omap_gpio_set_config(struct gpio_chip *chip, unsigned offset,
 	u32 debounce;
 	int ret = -ENOTSUPP;
 
-	if ((pinconf_to_config_param(config) == PIN_CONFIG_BIAS_DISABLE) ||
-	    (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_UP) ||
-	    (pinconf_to_config_param(config) == PIN_CONFIG_BIAS_PULL_DOWN)) {
+	switch (pinconf_to_config_param(config)) {
+	case PIN_CONFIG_BIAS_DISABLE:
+	case PIN_CONFIG_BIAS_PULL_UP:
+	case PIN_CONFIG_BIAS_PULL_DOWN:
 		ret = gpiochip_generic_config(chip, offset, config);
-	} else if (pinconf_to_config_param(config) == PIN_CONFIG_INPUT_DEBOUNCE) {
+		break;
+	case PIN_CONFIG_INPUT_DEBOUNCE:
 		debounce = pinconf_to_config_argument(config);
 		ret = omap_gpio_debounce(chip, offset, debounce);
+		break;
+	default:
+		break;
 	}
 
 	return ret;