r32.3.1 gpio question. how to access with /sys/class/gpio

This is the line from the spread sheet

GPIO7_TOUCH_RST B23 SAFE_STATE D33 H29 unused_SAFE_STATE GPIO3_PS.03 B O SCE RSVD1 RSVD2 RSVD3 RSVD1 safe_state_ps3 vddio_sys wake25 ST BDPGLP_IFC_VDP1P1P1 100k 1 GPIO_PS3 NORMAL NORMAL DISABLE 0 1 1 1 1 1 1 VALID GPIO3_PS.03 Output Drive 0 No Disable GPIO(SOM: GPIO7/TOUCH_RST)

So what is the mapping for /sys/class/gpio, the correct formula and support files would be appreciated.

Terry

This looks to be duplicate of https://devtalk.nvidia.com/default/topic/1071853/
GPIO_PS.3 is gpio 259.