MIPS: ath25: add Wireless device support

Atheros AR5312 and AR2315 both have a builtin wireless device, this
patch add helper code and register platform device for all supported
WiSoCs.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Cc: Linux MIPS <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/8249/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/ath25/devices.h b/arch/mips/ath25/devices.h
index 55adcf4..04d4141 100644
--- a/arch/mips/ath25/devices.h
+++ b/arch/mips/ath25/devices.h
@@ -28,6 +28,7 @@
 
 int ath25_find_config(phys_addr_t offset, unsigned long size);
 void ath25_serial_setup(u32 mapbase, int irq, unsigned int uartclk);
+int ath25_add_wmac(int nr, u32 base, int irq);
 
 static inline bool is_ar2315(void)
 {