MIPS: ath79: Add initial support for the Atheros AP121 reference board

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: Kathy Giori <kgiori@qca.qualcomm.com>
Cc: "Luis R.  Rodriguez" <rodrigue@qca.qualcomm.com>
Patchwork: https://patchwork.linux-mips.org/patch/2531/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ath79/Kconfig

@@ -2,6 +2,17 @@ if ATH79
 
 menu "Atheros AR71XX/AR724X/AR913X machine selection"
 
+config ATH79_MACH_AP121
+	bool "Atheros AP121 reference board"
+	select SOC_AR933X
+	select ATH79_DEV_GPIO_BUTTONS
+	select ATH79_DEV_LEDS_GPIO
+	select ATH79_DEV_SPI
+	select ATH79_DEV_USB
+	help
+	  Say 'Y' here if you want your kernel to support the
+	  Atheros AP121 reference board.
+
 config ATH79_MACH_AP81
 	bool "Atheros AP81 reference board"
 	select SOC_AR913X