[MIPS] Add generic GPIO support

Signed-off-by: NYoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -778,6 +778,9 @@ config GENERIC_ISA_DMA_SUPPORT_BROKEN
 	bool
 	select ZONE_DMA
 
+config GENERIC_GPIO
+	bool
+
 #
 # Endianess selection.  Sufficiently obscure so many users don't know what to
 # answer,so we try hard to limit the available choices.  Also the use of a

include/asm-mips/gpio.h

+#ifndef __ASM_MIPS_GPIO_H
+#define __ASM_MIPS_GPIO_H
+
+#include <gpio.h>
+
+#endif /* __ASM_MIPS_GPIO_H */