diff --git a/esphome/config.py b/esphome/config.py
index 73aa7077e0..36a81f677b 100644
--- a/esphome/config.py
+++ b/esphome/config.py
@@ -374,7 +374,10 @@ class LoadValidationStep(ConfigValidationStep):
                         path + [CONF_ID],
                     )
                     continue
-                result.add_str_error("No platform specified! See 'platform' key.", path)
+                result.add_str_error(
+                    f"'{self.domain}' requires a 'platform' key but it was not specified.",
+                    path,
+                )
                 continue
             # Remove temp output path and construct new one
             result.remove_output_path(path, p_domain)
@@ -449,9 +452,28 @@ class MetadataValidationStep(ConfigValidationStep):
 
         success = True
         for dependency in self.comp.dependencies:
-            if dependency not in result:
+            dependency_parts = dependency.split(".")
+            if len(dependency_parts) > 2:
                 result.add_str_error(
-                    f"Component {self.domain} requires component {dependency}",
+                    "Dependencies must be specified as a single component or in component.platform format only",
+                    self.path,
+                )
+                return
+            component_dep = dependency_parts[0]
+            platform_dep = dependency_parts[-1]
+            if component_dep not in result:
+                result.add_str_error(
+                    f"Component {self.domain} requires component {component_dep}",
+                    self.path,
+                )
+                success = False
+            elif component_dep != platform_dep and (
+                not isinstance(platform_list := result.get(component_dep), list)
+                or not any(CONF_PLATFORM in p for p in platform_list)
+                or not any(p[CONF_PLATFORM] == platform_dep for p in platform_list)
+            ):
+                result.add_str_error(
+                    f"Component {self.domain} requires 'platform: {platform_dep}' in component '{component_dep}'",
                     self.path,
                 )
                 success = False
diff --git a/script/list-components.py b/script/list-components.py
index 8e2d47c6b3..5b5fa5811f 100755
--- a/script/list-components.py
+++ b/script/list-components.py
@@ -69,7 +69,9 @@ def create_components_graph():
             sys.exit(1)
 
         for dependency in comp.dependencies:
-            add_item_to_components_graph(components_graph, dependency, name)
+            add_item_to_components_graph(
+                components_graph, dependency.split(".")[0], name
+            )
 
         for target_config in TARGET_CONFIGURATIONS:
             CORE.data[KEY_CORE] = target_config
@@ -87,7 +89,9 @@ def create_components_graph():
             add_item_to_components_graph(components_graph, platform_name, name)
 
             for dependency in platform.dependencies:
-                add_item_to_components_graph(components_graph, dependency, name)
+                add_item_to_components_graph(
+                    components_graph, dependency.split(".")[0], name
+                )
 
             for target_config in TARGET_CONFIGURATIONS:
                 CORE.data[KEY_CORE] = target_config