Add validate to components (#1631)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/rtttl/__init__.py

@@ -1,8 +1,11 @@
+import logging
 import esphome.codegen as cg
 import esphome.config_validation as cv
 from esphome import automation
 from esphome.components.output import FloatOutput
-from esphome.const import CONF_ID, CONF_OUTPUT, CONF_TRIGGER_ID
+from esphome.const import CONF_ID, CONF_OUTPUT, CONF_PLATFORM, CONF_TRIGGER_ID
+
+_LOGGER = logging.getLogger(__name__)
 
 CODEOWNERS = ["@glmnet"]
 CONF_RTTTL = "rtttl"
@@ -33,6 +36,33 @@ CONFIG_SCHEMA = cv.Schema(
 ).extend(cv.COMPONENT_SCHEMA)
 
 
+def validate(config, item_config):
+    # Not adding this to FloatOutput as this is the only component which needs `update_frequency`
+
+    parent_config = config.get_config_by_id(item_config[CONF_OUTPUT])
+    platform = parent_config[CONF_PLATFORM]
+
+    PWM_GOOD = ["esp8266_pwm", "ledc"]
+    PWM_BAD = [
+        "ac_dimmer ",
+        "esp32_dac",
+        "slow_pwm",
+        "mcp4725",
+        "pca9685",
+        "tlc59208f",
+        "my9231",
+        "sm16716",
+    ]
+
+    if platform in PWM_BAD:
+        raise ValueError(f"Component rtttl cannot use {platform} as output component")
+
+    if platform not in PWM_GOOD:
+        _LOGGER.warning(
+            "Component rtttl is not known to work with the selected output type. Make sure this output supports custom frequency output method."
+        )
+
+
 async def to_code(config):
     var = cg.new_Pvariable(config[CONF_ID])
     await cg.register_component(var, config)