1# GPIO JSON format 2 3GPIO definitions are stored in '/etc/default/obmc/gpio/gpio_defs.json' on the 4BMC. That file has 2 sections - 'gpio_configs' and 'gpio_definitions'. 5 6## gpio_configs 7 8This section contains the GPIOs used in power control. 9 10It looks like: 11``` 12"gpio_configs": { 13 "power_config": { 14 15 #See code in op-pwrctl for details 16 17 #Required 18 "power_good_in": "...", 19 20 #Required 21 "power_up_outs": [ 22 {"name": "...", "polarity": true/false}, 23 {"name": "...", "polarity": true/false} 24 ], 25 26 #Optional 27 "reset_outs": [ 28 {"name": "...", "polarity": true/false} 29 ], 30 31 #Optional 32 "latch_out": "...", 33 34 #Optional 35 "pci_reset_outs": [ 36 {"name": "...", "polarity": true/false, "hold": true/false} 37 ] 38 } 39} 40``` 41 42## gpio_definitions 43 44This section contains The GPIO pins and directions. 45 46It looks like: 47``` 48 "gpio_definitions": [ 49 { 50 51 #The name to look up this entry. 52 "name": "SOFTWARE_PGOOD", 53 54 #The GPIO pin. 55 "pin": "R1", 56 57 #Alternatively to the pin, can use 'num' which is the 58 #raw number the GPIO would be accessed with. 59 "num": 7, 60 61 #The GPIO direction - in, out, rising, falling, or both 62 "direction": "out" 63 }, 64 { 65 ... 66 } 67 ] 68``` 69 70