Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1].
[1] https://www.kernel.org/doc/html/latest/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200716212317.GA17754@embeddedor
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
 
                        case PIN_CONFIG_BIAS_PULL_UP:
                                if (arg)
                                        pcs_pinconf_clear_bias(pctldev, pin);
-                               /* fall through */
+                               fallthrough;
                        case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
                                data &= ~func->conf[i].mask;
                                if (arg)