designs/inventory/gpio-based-hardware-inventory.md

11 …ased cable presence detection](https://github.com/openbmc/docs/blob/46902afd6ebd20d1148379df99fe2c…
17 presence of cards, cables and other connected entities which may or may not be
18 plugged into a system. A subset of these entities support presence detection via
25 The existing design for the gpio based cable presence is partially implemented
28 …om/openbmc/docs/blob/879601d92becfa1dbc082f487abfb5e0151a5091/designs/gpio-based-cable-presence.md)
30 Currently the way to do gpio based presence detection is via
31 phosphor-multi-gpio-presence and phosphor-inventory-manager.
36 The presence daemon then toggles the 'Present' property on dbus interface
44 …presence daemon config](https://github.com/openbmc/openbmc/blob/1d438f68277cdb37e8062ae298402e9685…
49 phosphor-multi-gpio-presence configuration:
112 - Support for re-use of presence information in PROBE statements
119 which is 'gpio-presence-sensor'.
122 [NVIDIA gpio presence sensor implementation](https://github.com/NVIDIA/dbus-sensors/blob/889abc1c9b…
176 - EM exposes configuration for 'gpio-presence-sensor'
177 - 'gpio-presence-sensor' creates a dbus matcher to watch for removal of it's
179 - 'gpio-presence-sensor' uses gpios to detect hardware
180 - 'gpio-presence-sensor' creates a dbus interface when it detects hardware
187 - 'gpio-presence-sensor' detects that the hardware is gone
188 - 'gpio-presence-sensor' takes down the respective dbus interface
194 - EM exposes configuration for 'gpio-presence-sensor'
195 - 'gpio-presence-sensor' creates a dbus matcher to watch for removal of it's
197 - 'gpio-presence-sensor' uses gpios to detect hardware
198 - 'gpio-presence-sensor' creates a dbus interface when it detects hardware
199 - EM removes the config for 'gpio-presence-sensor'
200 - 'gpio-presence-sensor' takes down any dbus interfaces it created for detecting
207 'gpio-presence-sensor' should consume configuration via dbus interface
237 'gpio-presence-sensor' then exposes
258 In case the gpio state changes, 'gpio-presence-sensor' can remove the
316       "PresencePinNames": ["presence-cable0"],
322       "PresencePinNames": ["presence-slot0a", "presence-slot0b"],
328       "PresencePinNames": ["presence-slot0a", "presence-slot0b"],
334       "PresencePinNames": ["presence-slot0a", "presence-slot0b"],
340       "PresencePinNames": ["presence-fanboard0"],
391 - Presence detection integrated into entity-manager. There already exists a
392   presence daemon, and it's an explicit non-goal of EM to implement any presence
440 simply provide a hardcoded configuration for 'gpio-presence-sensor'. For the