From: David Bauer <mail@david-bauer.net>
Date: Tue, 11 Sep 2018 17:04:16 +0200
Subject: ar71xx: flag FritzBox 4020 buttons as active low

Buttons of AVM FritzBox 4020 are incorrectly flagged as active high.

This was an oversight as RFKill button was working as expected even
with incorrectly flagged GPIO.

Signed-off-by: David Bauer <mail@david-bauer.net>

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-fritz4020.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-fritz4020.c
index ed7f9a8b3ead80dbbe7f8d27c7dd5ecf0543d733..c00cf681b2da3ff4989fbf4c3de7b44075bb395a 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-fritz4020.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-fritz4020.c
@@ -169,7 +169,7 @@ static struct gpio_keys_button fritz4020_gpio_keys[] __initdata = {
 		.code			= KEY_RFKILL,
 		.debounce_interval	= FRITZ4020_KEYS_DEBOUNCE_INTERVAL,
 		.gpio			= FRITZ4020_GPIO_BTN_WLAN,
-		.active_low		= 0,
+		.active_low		= 1,
 	},
 	{
 		.desc			= "WPS button",
@@ -177,7 +177,7 @@ static struct gpio_keys_button fritz4020_gpio_keys[] __initdata = {
 		.code			= KEY_WPS_BUTTON,
 		.debounce_interval	= FRITZ4020_KEYS_DEBOUNCE_INTERVAL,
 		.gpio			= FRITZ4020_GPIO_BTN_WPS,
-		.active_low		= 0,
+		.active_low		= 1,
 	},
 };