diff --git a/homeassistant/components/mysensors/__init__.py b/homeassistant/components/mysensors/__init__.py
index 6c2d2f710e6..0bf4bb80a18 100644
--- a/homeassistant/components/mysensors/__init__.py
+++ b/homeassistant/components/mysensors/__init__.py
@@ -10,11 +10,9 @@ from mysensors import BaseAsyncGateway
 import voluptuous as vol
 
 from homeassistant import config_entries
-from homeassistant.components.device_tracker import DOMAIN as DEVICE_TRACKER_DOMAIN
 from homeassistant.components.mqtt import valid_publish_topic, valid_subscribe_topic
-from homeassistant.components.notify import DOMAIN as NOTIFY_DOMAIN
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import CONF_OPTIMISTIC
+from homeassistant.const import CONF_OPTIMISTIC, Platform
 from homeassistant.core import HomeAssistant, callback
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.discovery import async_load_platform
@@ -209,7 +207,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
     # Allow loading device tracker platform via discovery
     # until refactor to config entry is done.
 
-    for platform in (DEVICE_TRACKER_DOMAIN, NOTIFY_DOMAIN):
+    for platform in (Platform.DEVICE_TRACKER, Platform.NOTIFY):
         load_discovery_platform = partial(
             async_load_platform,
             hass,
@@ -269,7 +267,7 @@ async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
 @callback
 def setup_mysensors_platform(
     hass: HomeAssistant,
-    domain: str,  # hass platform name
+    domain: Platform,  # hass platform name
     discovery_info: DiscoveryInfo,
     device_class: type[MySensorsDevice] | dict[SensorType, type[MySensorsDevice]],
     device_args: (
diff --git a/homeassistant/components/mysensors/binary_sensor.py b/homeassistant/components/mysensors/binary_sensor.py
index a2118de3a76..fc924aa4873 100644
--- a/homeassistant/components/mysensors/binary_sensor.py
+++ b/homeassistant/components/mysensors/binary_sensor.py
@@ -4,12 +4,11 @@ from __future__ import annotations
 from homeassistant.components import mysensors
 from homeassistant.components.binary_sensor import (
     DEVICE_CLASSES,
-    DOMAIN,
     BinarySensorDeviceClass,
     BinarySensorEntity,
 )
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import STATE_ON
+from homeassistant.const import STATE_ON, Platform
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -41,7 +40,7 @@ async def async_setup_entry(
         """Discover and add a MySensors binary_sensor."""
         mysensors.setup_mysensors_platform(
             hass,
-            DOMAIN,
+            Platform.BINARY_SENSOR,
             discovery_info,
             MySensorsBinarySensor,
             async_add_entities=async_add_entities,
@@ -52,7 +51,7 @@ async def async_setup_entry(
         config_entry.entry_id,
         async_dispatcher_connect(
             hass,
-            MYSENSORS_DISCOVERY.format(config_entry.entry_id, DOMAIN),
+            MYSENSORS_DISCOVERY.format(config_entry.entry_id, Platform.BINARY_SENSOR),
             async_discover,
         ),
     )
diff --git a/homeassistant/components/mysensors/climate.py b/homeassistant/components/mysensors/climate.py
index 4a12b872bdc..0157d06ca2e 100644
--- a/homeassistant/components/mysensors/climate.py
+++ b/homeassistant/components/mysensors/climate.py
@@ -8,7 +8,6 @@ from homeassistant.components.climate import ClimateEntity
 from homeassistant.components.climate.const import (
     ATTR_TARGET_TEMP_HIGH,
     ATTR_TARGET_TEMP_LOW,
-    DOMAIN,
     HVAC_MODE_AUTO,
     HVAC_MODE_COOL,
     HVAC_MODE_HEAT,
@@ -18,7 +17,12 @@ from homeassistant.components.climate.const import (
     SUPPORT_TARGET_TEMPERATURE_RANGE,
 )
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import ATTR_TEMPERATURE, TEMP_CELSIUS, TEMP_FAHRENHEIT
+from homeassistant.const import (
+    ATTR_TEMPERATURE,
+    TEMP_CELSIUS,
+    TEMP_FAHRENHEIT,
+    Platform,
+)
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -54,7 +58,7 @@ async def async_setup_entry(
         """Discover and add a MySensors climate."""
         mysensors.setup_mysensors_platform(
             hass,
-            DOMAIN,
+            Platform.CLIMATE,
             discovery_info,
             MySensorsHVAC,
             async_add_entities=async_add_entities,
@@ -65,7 +69,7 @@ async def async_setup_entry(
         config_entry.entry_id,
         async_dispatcher_connect(
             hass,
-            MYSENSORS_DISCOVERY.format(config_entry.entry_id, DOMAIN),
+            MYSENSORS_DISCOVERY.format(config_entry.entry_id, Platform.CLIMATE),
             async_discover,
         ),
     )
diff --git a/homeassistant/components/mysensors/const.py b/homeassistant/components/mysensors/const.py
index 9feca1e6369..9ad7aa3c084 100644
--- a/homeassistant/components/mysensors/const.py
+++ b/homeassistant/components/mysensors/const.py
@@ -163,7 +163,7 @@ FLAT_PLATFORM_TYPES: dict[tuple[str, SensorType], set[ValueType]] = {
     for s_type_name, v_type_name in platform_types.items()
 }
 
-TYPE_TO_PLATFORMS: dict[SensorType, list[str]] = defaultdict(list)
+TYPE_TO_PLATFORMS: dict[SensorType, list[Platform]] = defaultdict(list)
 
 for platform, platform_types in PLATFORM_TYPES.items():
     for s_type_name in platform_types:
diff --git a/homeassistant/components/mysensors/cover.py b/homeassistant/components/mysensors/cover.py
index 102f7ccaca8..f1d7a4cdbf4 100644
--- a/homeassistant/components/mysensors/cover.py
+++ b/homeassistant/components/mysensors/cover.py
@@ -5,9 +5,9 @@ from enum import Enum, unique
 from typing import Any
 
 from homeassistant.components import mysensors
-from homeassistant.components.cover import ATTR_POSITION, DOMAIN, CoverEntity
+from homeassistant.components.cover import ATTR_POSITION, CoverEntity
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import STATE_OFF, STATE_ON
+from homeassistant.const import STATE_OFF, STATE_ON, Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -37,7 +37,7 @@ async def async_setup_entry(
         """Discover and add a MySensors cover."""
         mysensors.setup_mysensors_platform(
             hass,
-            DOMAIN,
+            Platform.COVER,
             discovery_info,
             MySensorsCover,
             async_add_entities=async_add_entities,
@@ -48,7 +48,7 @@ async def async_setup_entry(
         config_entry.entry_id,
         async_dispatcher_connect(
             hass,
-            MYSENSORS_DISCOVERY.format(config_entry.entry_id, DOMAIN),
+            MYSENSORS_DISCOVERY.format(config_entry.entry_id, Platform.COVER),
             async_discover,
         ),
     )
diff --git a/homeassistant/components/mysensors/device.py b/homeassistant/components/mysensors/device.py
index 35b15bc3595..0ced1520758 100644
--- a/homeassistant/components/mysensors/device.py
+++ b/homeassistant/components/mysensors/device.py
@@ -8,7 +8,7 @@ from typing import Any
 from mysensors import BaseAsyncGateway, Sensor
 from mysensors.sensor import ChildSensor
 
-from homeassistant.const import ATTR_BATTERY_LEVEL, STATE_OFF, STATE_ON
+from homeassistant.const import ATTR_BATTERY_LEVEL, STATE_OFF, STATE_ON, Platform
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity import DeviceInfo, Entity
@@ -209,7 +209,7 @@ class MySensorsDevice:
 
 
 def get_mysensors_devices(
-    hass: HomeAssistant, domain: str
+    hass: HomeAssistant, domain: Platform
 ) -> dict[DevId, MySensorsDevice]:
     """Return MySensors devices for a hass platform name."""
     if MYSENSORS_PLATFORM_DEVICES.format(domain) not in hass.data[DOMAIN]:
diff --git a/homeassistant/components/mysensors/device_tracker.py b/homeassistant/components/mysensors/device_tracker.py
index ecb43a96aa4..a6d976f753c 100644
--- a/homeassistant/components/mysensors/device_tracker.py
+++ b/homeassistant/components/mysensors/device_tracker.py
@@ -5,7 +5,7 @@ from collections.abc import Callable
 from typing import Any
 
 from homeassistant.components import mysensors
-from homeassistant.components.device_tracker import DOMAIN
+from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.util import slugify
@@ -26,7 +26,7 @@ async def async_setup_scanner(
 
     new_devices = mysensors.setup_mysensors_platform(
         hass,
-        DOMAIN,
+        Platform.DEVICE_TRACKER,
         discovery_info,
         MySensorsDeviceScanner,
         device_args=(hass, async_see),
diff --git a/homeassistant/components/mysensors/handler.py b/homeassistant/components/mysensors/handler.py
index 98242615f67..4d61a2812ae 100644
--- a/homeassistant/components/mysensors/handler.py
+++ b/homeassistant/components/mysensors/handler.py
@@ -3,6 +3,7 @@ from __future__ import annotations
 
 from mysensors import Message
 
+from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.dispatcher import async_dispatcher_send
 from homeassistant.util import decorator
@@ -66,7 +67,7 @@ async def handle_sketch_version(
 
 @callback
 def _handle_child_update(
-    hass: HomeAssistant, gateway_id: GatewayId, validated: dict[str, list[DevId]]
+    hass: HomeAssistant, gateway_id: GatewayId, validated: dict[Platform, list[DevId]]
 ) -> None:
     """Handle a child update."""
     signals: list[str] = []
diff --git a/homeassistant/components/mysensors/helpers.py b/homeassistant/components/mysensors/helpers.py
index eba382fb52d..5b6682393b1 100644
--- a/homeassistant/components/mysensors/helpers.py
+++ b/homeassistant/components/mysensors/helpers.py
@@ -10,7 +10,7 @@ from mysensors import BaseAsyncGateway, Message
 from mysensors.sensor import ChildSensor
 import voluptuous as vol
 
-from homeassistant.const import CONF_NAME
+from homeassistant.const import CONF_NAME, Platform
 from homeassistant.core import HomeAssistant, callback
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_send
@@ -148,7 +148,9 @@ def invalid_msg(
     )
 
 
-def validate_set_msg(gateway_id: GatewayId, msg: Message) -> dict[str, list[DevId]]:
+def validate_set_msg(
+    gateway_id: GatewayId, msg: Message
+) -> dict[Platform, list[DevId]]:
     """Validate a set message."""
     if not validate_node(msg.gateway, msg.node_id):
         return {}
@@ -170,9 +172,9 @@ def validate_child(
     node_id: int,
     child: ChildSensor,
     value_type: int | None = None,
-) -> defaultdict[str, list[DevId]]:
+) -> defaultdict[Platform, list[DevId]]:
     """Validate a child. Returns a dict mapping hass platform names to list of DevId."""
-    validated: defaultdict[str, list[DevId]] = defaultdict(list)
+    validated: defaultdict[Platform, list[DevId]] = defaultdict(list)
     pres: type[IntEnum] = gateway.const.Presentation
     set_req: type[IntEnum] = gateway.const.SetReq
     child_type_name: SensorType | None = next(
@@ -186,7 +188,7 @@ def validate_child(
     value_type_names: set[ValueType] = {
         member.name for member in set_req if member.value in value_types
     }
-    platforms: list[str] = TYPE_TO_PLATFORMS.get(child_type_name, [])
+    platforms: list[Platform] = TYPE_TO_PLATFORMS.get(child_type_name, [])
     if not platforms:
         _LOGGER.warning("Child type %s is not supported", child.type)
         return validated
diff --git a/homeassistant/components/mysensors/light.py b/homeassistant/components/mysensors/light.py
index 0c80cf31c9a..1fbce6bbfa0 100644
--- a/homeassistant/components/mysensors/light.py
+++ b/homeassistant/components/mysensors/light.py
@@ -11,11 +11,10 @@ from homeassistant.components.light import (
     COLOR_MODE_BRIGHTNESS,
     COLOR_MODE_RGB,
     COLOR_MODE_RGBW,
-    DOMAIN,
     LightEntity,
 )
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import STATE_OFF, STATE_ON
+from homeassistant.const import STATE_OFF, STATE_ON, Platform
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
@@ -42,7 +41,7 @@ async def async_setup_entry(
         """Discover and add a MySensors light."""
         mysensors.setup_mysensors_platform(
             hass,
-            DOMAIN,
+            Platform.LIGHT,
             discovery_info,
             device_class_map,
             async_add_entities=async_add_entities,
@@ -53,7 +52,7 @@ async def async_setup_entry(
         config_entry.entry_id,
         async_dispatcher_connect(
             hass,
-            MYSENSORS_DISCOVERY.format(config_entry.entry_id, DOMAIN),
+            MYSENSORS_DISCOVERY.format(config_entry.entry_id, Platform.LIGHT),
             async_discover,
         ),
     )
diff --git a/homeassistant/components/mysensors/notify.py b/homeassistant/components/mysensors/notify.py
index 109b357dee7..042abe1515a 100644
--- a/homeassistant/components/mysensors/notify.py
+++ b/homeassistant/components/mysensors/notify.py
@@ -4,7 +4,8 @@ from __future__ import annotations
 from typing import Any
 
 from homeassistant.components import mysensors
-from homeassistant.components.notify import ATTR_TARGET, DOMAIN, BaseNotificationService
+from homeassistant.components.notify import ATTR_TARGET, BaseNotificationService
+from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
 
 from .const import DevId, DiscoveryInfo
@@ -20,7 +21,7 @@ async def async_get_service(
         return None
 
     new_devices = mysensors.setup_mysensors_platform(
-        hass, DOMAIN, discovery_info, MySensorsNotificationDevice
+        hass, Platform.NOTIFY, discovery_info, MySensorsNotificationDevice
     )
     if not new_devices:
         return None
@@ -51,7 +52,7 @@ class MySensorsNotificationService(BaseNotificationService):
         self.devices: dict[
             DevId, MySensorsNotificationDevice
         ] = mysensors.get_mysensors_devices(
-            hass, DOMAIN
+            hass, Platform.NOTIFY
         )  # type: ignore[assignment]
 
     async def async_send_message(self, message: str = "", **kwargs: Any) -> None:
diff --git a/homeassistant/components/mysensors/sensor.py b/homeassistant/components/mysensors/sensor.py
index 9d02571cf49..ecc42c5a0bf 100644
--- a/homeassistant/components/mysensors/sensor.py
+++ b/homeassistant/components/mysensors/sensor.py
@@ -7,7 +7,6 @@ from awesomeversion import AwesomeVersion
 
 from homeassistant.components import mysensors
 from homeassistant.components.sensor import (
-    DOMAIN,
     SensorDeviceClass,
     SensorEntity,
     SensorEntityDescription,
@@ -32,6 +31,7 @@ from homeassistant.const import (
     TEMP_CELSIUS,
     TEMP_FAHRENHEIT,
     VOLUME_CUBIC_METERS,
+    Platform,
 )
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
@@ -197,7 +197,7 @@ async def async_setup_entry(
         """Discover and add a MySensors sensor."""
         mysensors.setup_mysensors_platform(
             hass,
-            DOMAIN,
+            Platform.SENSOR,
             discovery_info,
             MySensorsSensor,
             async_add_entities=async_add_entities,
@@ -208,7 +208,7 @@ async def async_setup_entry(
         config_entry.entry_id,
         async_dispatcher_connect(
             hass,
-            MYSENSORS_DISCOVERY.format(config_entry.entry_id, DOMAIN),
+            MYSENSORS_DISCOVERY.format(config_entry.entry_id, Platform.SENSOR),
             async_discover,
         ),
     )
diff --git a/homeassistant/components/mysensors/switch.py b/homeassistant/components/mysensors/switch.py
index 7c6602b7373..d8492e5e4a6 100644
--- a/homeassistant/components/mysensors/switch.py
+++ b/homeassistant/components/mysensors/switch.py
@@ -6,9 +6,9 @@ from typing import Any
 import voluptuous as vol
 
 from homeassistant.components import mysensors
-from homeassistant.components.switch import DOMAIN, SwitchEntity
+from homeassistant.components.switch import SwitchEntity
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import ATTR_ENTITY_ID, STATE_OFF, STATE_ON
+from homeassistant.const import ATTR_ENTITY_ID, STATE_OFF, STATE_ON, Platform
 from homeassistant.core import HomeAssistant, ServiceCall
 import homeassistant.helpers.config_validation as cv
 from homeassistant.helpers.dispatcher import async_dispatcher_connect
@@ -57,7 +57,7 @@ async def async_setup_entry(
         """Discover and add a MySensors switch."""
         mysensors.setup_mysensors_platform(
             hass,
-            DOMAIN,
+            Platform.SWITCH,
             discovery_info,
             device_class_map,
             async_add_entities=async_add_entities,
@@ -67,7 +67,7 @@ async def async_setup_entry(
         """Set IR code as device state attribute."""
         entity_ids = service.data.get(ATTR_ENTITY_ID)
         ir_code = service.data.get(ATTR_IR_CODE)
-        devices = mysensors.get_mysensors_devices(hass, DOMAIN)
+        devices = mysensors.get_mysensors_devices(hass, Platform.SWITCH)
 
         if entity_ids:
             _devices = [
@@ -99,7 +99,7 @@ async def async_setup_entry(
         config_entry.entry_id,
         async_dispatcher_connect(
             hass,
-            MYSENSORS_DISCOVERY.format(config_entry.entry_id, DOMAIN),
+            MYSENSORS_DISCOVERY.format(config_entry.entry_id, Platform.SWITCH),
             async_discover,
         ),
     )