MIPS: ath25: add UART support

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/8242/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/ath25/devices.h

diff --git a/arch/mips/ath25/devices.h b/arch/mips/ath25/devices.h
index 2985586..23b53cb 100644
--- a/arch/mips/ath25/devices.h
+++ b/arch/mips/ath25/devices.h
@@ -9,6 +9,8 @@
 
 extern void (*ath25_irq_dispatch)(void);
 
+void ath25_serial_setup(u32 mapbase, int irq, unsigned int uartclk);
+
 static inline bool is_ar2315(void)
 {
 	return (current_cpu_data.cputype == CPU_4KEC);