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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/component.h
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@@ -4,16 +4,38 @@
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 #include <linux/stddef.h>
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+
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 struct device;
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+/**
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+ * struct component_ops - callbacks for component drivers
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+ *
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+ * Components are registered with component_add() and unregistered with
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+ * component_del().
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+ */
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 struct component_ops {
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+	/**
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+	 * @bind:
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+	 *
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+	 * Called through component_bind_all() when the aggregate driver is
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+	 * ready to bind the overall driver.
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+	 */
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 	int (*bind)(struct device *comp, struct device *master,
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 		    void *master_data);
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+	/**
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+	 * @unbind:
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+	 *
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+	 * Called through component_unbind_all() when the aggregate driver is
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+	 * ready to bind the overall driver, or when component_bind_all() fails
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+	 * part-ways through and needs to unbind some already bound components.
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+	 */
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 	void (*unbind)(struct device *comp, struct device *master,
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 		       void *master_data);
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 };
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 int component_add(struct device *, const struct component_ops *);
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+int component_add_typed(struct device *dev, const struct component_ops *ops,
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+	int subcomponent);
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 void component_del(struct device *, const struct component_ops *);
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 int component_bind_all(struct device *master, void *master_data);
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@@ -21,8 +43,42 @@
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 struct master;
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+/**
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+ * struct component_master_ops - callback for the aggregate driver
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+ *
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+ * Aggregate drivers are registered with component_master_add_with_match() and
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+ * unregistered with component_master_del().
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+ */
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 struct component_master_ops {
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+	/**
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+	 * @bind:
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+	 *
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+	 * Called when all components or the aggregate driver, as specified in
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+	 * the match list passed to component_master_add_with_match(), are
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+	 * ready. Usually there are 3 steps to bind an aggregate driver:
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+	 *
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+	 * 1. Allocate a structure for the aggregate driver.
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+	 *
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+	 * 2. Bind all components to the aggregate driver by calling
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+	 *    component_bind_all() with the aggregate driver structure as opaque
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+	 *    pointer data.
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+	 *
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+	 * 3. Register the aggregate driver with the subsystem to publish its
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+	 *    interfaces.
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+	 *
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+	 * Note that the lifetime of the aggregate driver does not align with
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+	 * any of the underlying &struct device instances. Therefore devm cannot
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+	 * be used and all resources acquired or allocated in this callback must
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+	 * be explicitly released in the @unbind callback.
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+	 */
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 	int (*bind)(struct device *master);
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+	/**
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+	 * @unbind:
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+	 *
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+	 * Called when either the aggregate driver, using
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+	 * component_master_del(), or one of its components, using
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+	 * component_del(), is unregistered.
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+	 */
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 	void (*unbind)(struct device *master);
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 };
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@@ -37,7 +93,27 @@
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 	struct component_match **matchptr,
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 	void (*release)(struct device *, void *),
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 	int (*compare)(struct device *, void *), void *compare_data);
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+void component_match_add_typed(struct device *master,
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+	struct component_match **matchptr,
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+	int (*compare_typed)(struct device *, int, void *), void *compare_data);
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+/**
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+ * component_match_add - add a component match entry
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+ * @master: device with the aggregate driver
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+ * @matchptr: pointer to the list of component matches
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+ * @compare: compare function to match against all components
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+ * @compare_data: opaque pointer passed to the @compare function
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+ *
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+ * Adds a new component match to the list stored in @matchptr, which the @master
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+ * aggregate driver needs to function. The list of component matches pointed to
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+ * by @matchptr must be initialized to NULL before adding the first match. This
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+ * only matches against components added with component_add().
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+ *
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+ * The allocated match list in @matchptr is automatically released using devm
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+ * actions.
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+ *
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+ * See also component_match_add_release() and component_match_add_typed().
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+ */
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 static inline void component_match_add(struct device *master,
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 	struct component_match **matchptr,
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 	int (*compare)(struct device *, void *), void *compare_data)