Linux/OMAP-L138: Where is the code to configure the GP0[9] to LED located ?

Part Number:OMAP-L138

Tool/software: Linux

Hi,

Before, I post the "Linux/OMAP-L138: How can I the pin GP0[9] to "gpio-keys"?" question.

The system can boot.

But I can't get the interrupt.

As we know, the GP0[9] is LED in the LCDK.

I want to locate the code about the GP0[9] as the LED, because it is not in the dts.

Thanks for listenning.