Hello, on our board we have one LED with 2 gpio connected to it:
 - when gpio0 is on and gpio1 on - LED is orange.
 - when gpio0 is on and gpio1 off - LED is green.
 - when gpio0 is off and gpio1 on - LED is red.
 - when gpio0 is off and gpio1 off - LED is off.
We want use led_trigger (nand-disk) on this LED.
Below patch which we use for get one LED on 2 gpios.
Can be this in mainline, or may be exist other - better way?

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Dmitry Bondar, 
simicon.com