commit	5f3c2e5b1115d0b532c8dc5330009fea42d4f15b	[log] [tgz]
author	LioraGuo-wiwynn <liora.guo.wiwynn@gmail.com>	Sun Jul 20 18:04:39 2025 +0800
committer	liora.guo.wiwynn <liora.guo.wiwynn@gmail.com>	Tue Aug 12 00:14:42 2025 +0000
tree	b86d27e25c6c28a9f9ca030b883749711700c784
parent	8854325aa3a635f7678cf176bb7221e7ec9d5d5d [diff]

tree: b86d27e25c6c28a9f9ca030b883749711700c784

README.md

phosphor-buttons

Phosphor-buttons has a collection of IO event handler interfaces for physical inputs which are typically part of some sort of panel.

It defines an individual dbus interface object for each physical button/switch inputs such as power button, reset button etc. Each button interface monitors its associated IO for event changes and emits signals that the button-handler application listens for.

Button Behavior

Power Button

All events occur when the button is released.

If the power is off, power on the host.

If the power is on, it depends on how long the press was and which options are enabled:

Short press: Do a host power off
Long press, as determined by the 'long-press-time-ms' meson option: Do a chassis (hard) power off.

Custom Power Button Profiles

The 'power-button-profile' meson option can be used to select custom power button profiles that have different behaviors.

Available profiles are:

host_then_chassis_poweroff: When power is on, short presses are ignored and a long press issues a host power off first and then a chassis power off if held past a certain time. This class has additional details.

Multi-Host Buttons

See this section below.

Reset Button

When released:

If 'reset-button-do-warm-reboot' meson option is set to enabled, does warm reboot the host.
Otherwise, reboots the host (default behavior)

ID Button

When released, toggles the 'enclosure_identify' LED group provided by the phosphor-led-manager repository. The group name can be changed using the 'id-led-group' meson option.

Gpio defs config

In order to monitor a button/input interface the respective gpio config details should be mentioned in the gpio defs json file - /etc/default/obmc/gpio/gpio_defs.json

The button interface type name.
An array consists of single or multiple gpio configs associated with the specific button interface.

A gpio can be mapped using the "pin" or "num" keyword. The "pin" key uses alphanumerical references while the "num" key supports the integer pin number.

example gpio def Json config

{
  "gpio_definitions": [
    {
      "name": "POWER_BUTTON",
      "pin": "D0",
      "direction": "both"
    },
    {
      "name": "RESET_BUTTON",
      "pin": "AB0",
      "direction": "both"
    },
    {
      "name": "HOST_SELECTOR",

      "group_gpio_config": [
        {
          "pin": "AA4",
          "direction": "both"
        },
        {
          "pin": "AA5",
          "direction": "both"
        },
        {
          "pin": "AA6",
          "direction": "both"
        },
        {
          "pin": "AA7",
          "direction": "both"
        }
      ]
    }
  ]
}

Single gpio config

This config is original config which can be used for configs with only single gpio such as power button,reset button, OCP debug card host select button.

{
  "name": "POWER_BUTTON",
  "pin": "D0",
  "direction": "both"
}

Note: this config is used by most of the other platforms so this format is kept as it is so that existing gpio configs do not get affected.

Group gpio config

The following configs are related to multi-host bmc systems more info explained in the design: https://github.com/openbmc/docs/blob/master/designs/multihost-phosphor-buttons.md

Host selector gpio config example

The host selector has four gpios associated. So the related gpios are mentioned in a json array named group_gpio_config.

name - This is name of the specific gpio line
pin - This represents the pin number from linux dts file.
polarity - polarity type of the gpio
max_position - This represents the max number of hosts in the multi-host bmc system.
host_selector_map - This map is oem specific host position map which has how the value read from the host selector gpios is mapped to the respective host number.

Optional: Polling Configuration Some platforms expose the host selector via a CPLD as GPIO inputs without edge-triggered interrupt support (e.g., no edge detection on GPIOs). In such situations, software-based polling mode can be enabled using the following optional fields in the JSON configuration:

polling_mode : Set to true to enable polling mode.
polling_interval_ms (optional): Polling interval in milliseconds. Defaults to 1000 ms if not specified.

Config Example

A.Interrupt example

Example : The value of "7" derived from the 4 host select gpio lines are mapped to host position 1.

{
  "name": "HOST_SELECTOR",

  "group_gpio_config": [
    {
      "name": "host_select_0",
      "pin": "AA4",
      "direction": "both",
      "polarity": "active_high"
    },
    {
      "name": "host_select_1",
      "pin": "AA5",
      "direction": "both",
      "polarity": "active_high"
    },
    {
      "name": "host_select_2",
      "pin": "AA6",
      "direction": "both",
      "polarity": "active_high"
    },
    {
      "name": "host_select_3",
      "pin": "AA7",
      "direction": "both",
      "polarity": "active_high"
    }
  ],
  "max_position": 4,
  "host_selector_map": {
    "6": 0,
    "7": 1,
    "8": 2,
    "9": 3,
    "10": 4,
    "11": 0,
    "12": 1,
    "13": 2,
    "14": 3,
    "15": 4
  }
}

B.Polling example

{
  "name": "HOST_SELECTOR",
  "polling_mode": true,
  "polling_interval_ms": 3000,
  "group_gpio_config": [
    {
      "name": "host_select_sel_0",
      "num": 2340,
      "direction": "in",
      "polarity": "active_low"
    },
    {
      "name": "host_select_sel_1",
      "num": 2341,
      "direction": "in",
      "polarity": "active_low"
    },
    {
      "name": "host_select_sel_2",
      "num": 2342,
      "direction": "in",
      "polarity": "active_low"
    },
    {
      "name": "host_select_sel_3",
      "num": 2343,
      "direction": "in",
      "polarity": "active_low"
    }
  ],
  "max_position": 8,
  "host_selector_map": {
    "0": 0,
    "1": 1,
    "2": 2,
    "3": 3,
    "4": 4,
    "5": 5,
    "6": 6,
    "7": 7,
    "8": 8
  }
}

Host selector cpld config example

There are also some systems that get the host selector selection from the CPLD, the configuration is provided below.

name - The button interface type name.
i2c_bus - The i2c bus of cpld
i2c_address - The i2c address of cpld
register_name - The register file name exported by CLD driver for IO event listen
max_position - This represents the max number of hosts in the multi-host bmc system.

{
  "cpld_definitions": [
    {
      "name": "HOST_SELECTOR",
      "i2c_bus": 12,
      "i2c_address": 15,
      "register_name": "uart-selection-debug-card",
      "max_position": 4
    }
  ]
}

Serial uart mux config

Similar to host selector there are multiple gpios associated with the serial uart mux. These gpio configs are specified as part of json array "group_gpio_config".

Here the serial uart mux output is accessed via OCP debug card. SO the OCP debug card present gpio is mentioned part of the group_gpio_config. The debug card present gpio is identified by its name "debug_card_present".

The other gpios part of the group gpio config is serial uart MUX gpio select lines and serial_uart_rx line.

name - this is name of the specific gpio line
pin - this represents the pin number from linux dts file.
polarity - polarity type of the gpio
serial_uart_mux_map - This is the map for selected host position to the serial uart mux select output value

{
  "name": "SERIAL_UART_MUX",

  "group_gpio_config": [
    {
      "name": "serial_uart_sel_0",
      "pin": "E0",
      "direction": "out",
      "polarity": "active_high"
    },
    {
      "name": "serial_uart_sel_1",
      "pin": "E1",
      "direction": "out",
      "polarity": "active_high"
    },
    {
      "name": "serial_uart_sel_2",
      "pin": "E2",
      "direction": "out",
      "polarity": "active_high"
    },
    {
      "name": "serial_uart_sel_3",
      "pin": "E3",
      "direction": "out",
      "polarity": "active_high"
    },
    {
      "name": "serial_uart_rx",
      "pin": "E4",
      "direction": "out",
      "polarity": "active_high"
    },
    {
      "name": "debug_card_present",
      "pin": "R3",
      "direction": "both",
      "polarity": "active_high"
    }
  ],
  "serial_uart_mux_map": {
    "0": 4,
    "1": 0,
    "2": 1,
    "3": 2,
    "4": 3
  }
}

Multiple power gpio config example

This config is used for configs with multiple power buttons on each slots and whole sled, or for which needs multi-level chassis power control behavior.

name - this is name of the specific gpio line, "POWER_BUTTON" + the index of chassis instance

pin - this represents the pin number from linux dts file.
multi-action - default no action, set the corresponding behavior with following format:
duration - activate when pulling gpio over this value (unit: millisecond)
action - chassis power control behavior

{
  "gpio_definitions": [
    {
      "name": "POWER_BUTTON0",
      "pin": "I6",
      "direction": "both",
      "multi-action": [
        {
          "duration": 4000,
          "action": "chassis cycle"
        }
      ]
    },
    {
      "name": "POWER_BUTTON1",
      "pin": "V0",
      "direction": "both",
      "multi-action": [
        {
          "duration": 0,
          "action": "chassis on"
        },
        {
          "duration": 4000,
          "action": "chassis cycle"
        },
        {
          "duration": 8000,
          "action": "chassis off"
        }
      ]
    }
  ]
}