[PATCH][next] gpio: ath79: Fix fall-through warning for Clang

[Gustavo A. R. Silva]

In preparation to enable -Wimplicit-fallthrough for Clang, fix a
warning by explicitly adding a fallthrough pseudo-keyword to indicate
that the code is intended to fall through to the next case.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavo...@kernel.org>
---
 drivers/gpio/gpio-ath79.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/gpio-ath79.c b/drivers/gpio/gpio-ath79.c
index d5359341cc6b..678ddd375891 100644
--- a/drivers/gpio/gpio-ath79.c
+++ b/drivers/gpio/gpio-ath79.c
@@ -123,6 +123,7 @@ static int ath79_gpio_irq_set_type(struct irq_data *data,
        switch (flow_type) {
        case IRQ_TYPE_EDGE_RISING:
                polarity |= mask;
+               fallthrough;
        case IRQ_TYPE_EDGE_FALLING:
        case IRQ_TYPE_EDGE_BOTH:
                break;
-- 
2.27.0