How to modify a specfic pin when compiling kernel

Hi. I’m using Orin NX 16GB with JP 5.1.
I’d like to change the settings of “PCIE1_RST*”, which is shown in pic below.

I’ve downloaded kernel sources. Could you help tell me which file to modify? Thanks.

I suppose the pinmux sheet should be of help. However, I can’t enable macros on my PC, so it’s unusable now.

There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.

Sorry for the late response, have you managed to get issue resolved or still need the support? Thanks