Android GPIO brief analysis

gpio简单查询和设置：  
        设置用 echo out 153 0 >  /sys/devices/platform/1000b000.pinctrl/mt_gpio
		查询用 cat   /sys/devices/platform/1000b000.pinctrl/mt_gpio


		project:/ $ cat /sys/devices/platform/1000b000.pinctrl/mt_gpio
		gpio base: 0x14c, pins: 180
		PIN: (MODE)(DIR)(DOUT)(DIN)(DRIVE)(SMT)(IES)(PULL_EN)(PULL_SEL)(R1 R0)
		000: 0001 01100
		001: 0001 01111
		002: 0001 01111
		003: 0001 01111


            <gpio175>
                <eint_mode>false</eint_mode>     ----GPIO的eint模式
                <def_mode>0</def_mode>			 ----GPIO的模式
                <inpull_en>true</inpull_en>
                <inpull_selhigh>false</inpull_selhigh>
                <def_dir>OUT</def_dir>
                <out_high>false</out_high>		 ----初始化输出拉低0/当为true时就为高1
                <smt>false</smt>
                <ies>true</ies>
            </gpio175>