docs/designs/multihost-phosphor-buttons.md

57 example for a multihost platform yosemite-V2 it has host selector switch mux as
74 |     |                | |  |     |  selector     |------+         |             |
95 ## 1.Host selector switch (selector switch)
97 This host selector switch/selector switch has 4 gpio connected as input and
98 based on the gpio state values the host selector switch value is derived. The
100 values and host selector values can be stored as part of gpio json config.
105 For example, when the power button is pressed, The value of the host selector
112 selector switch position.
116 host selector position value = 0,bmc is mapped to power and reset buttons host
117 selector position value = 1,host 1 is mapped to power and reset buttons host
118 selector position value = 2,host 2 is mapped to power and reset buttons host
119 selector position value = 3,host 3 is mapped to power and reset buttons host
120 selector position value = 4,host 4 is mapped to power and reset buttons
130 Based on the position of the host selector switch, a separate handler interface
133 ## 3.OCP debug card host selector button
138 3.host selector button
143 The host selector button purpose is same as that of the front panel host
144 selector switch in yosemitev2 front panel. The debug card host selector button
145 (push button) has different gpio lines than that of front panel host selector
146 switch gpios. Whenever the debug host selector button is pressed the host
147 selector switch position value should be increased up to MaxPosition. If the
148 host selector switch value is more than MaxPosition then it should be reset to
171 ## The host selector switch interface
173 The host selector switch has 4 gpios associated with it. host selector switch
177 Based on the 4 gpio state values, the host selector switch position value is
180 ### Host selector dbus interface details
183    the host selector switch based on the GPIO state.
189 ## OCP Debug card host selector button interface
191 A separate interface for debug card host selector button is created.
196 ### OCP Debug card host selector button dbus interface details :
202 selector switch dbus property "Position" is increased by 1. The host selector
206 This way when power and reset button press events are handled, the Host selector
212 This button interface monitors for change in host selector switch Position dbus
224 If selector button instance is available,then the power button and reset button
232 respective host dbus object is based on host selector position.