ISL3893 GPIO experiments

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GPIO experiments

While trying to get the gpio lines controllable from userspace I got realy frustrated. After some module_howtos IO managed to controll the WAN led (*yeah*) 

gpio1_dr  20c2 (wr)
gpio1_st  f1ce (rd)
gpio1_ddr 20e2 (ctrl)

gpio2_dr  0
gpio2_st  c0f
gpio2_ddr 0

gpio3_dr  80
gpio3_st  b0
gpio3_ddr 8f
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