mfd: core: Remove .enable() and .disable() callbacks

With commit dd77f5fa97d3 ("mfd: Remove toshiba tmio drivers") the last
mfd driver that implements these callbacks is gone and since commit
652719b1 ("w1: remove ds1wm driver") the last user is gone. The
corresponding functions mfd_cell_enable() and mfd_cell_disable() are
also unused (since commit 0ca222c8 ("leds: Remove asic3 driver")).
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230308091257.2404932-1-u.kleine-koenig@pengutronix.de

drivers/mfd/mfd-core.c

@@ -33,32 +33,6 @@ static struct device_type mfd_dev_type = {
 	.name	= "mfd_device",
 };
 
-int mfd_cell_enable(struct platform_device *pdev)
-{
-	const struct mfd_cell *cell = mfd_get_cell(pdev);
-
-	if (!cell->enable) {
-		dev_dbg(&pdev->dev, "No .enable() call-back registered\n");
-		return 0;
-	}
-
-	return cell->enable(pdev);
-}
-EXPORT_SYMBOL(mfd_cell_enable);
-
-int mfd_cell_disable(struct platform_device *pdev)
-{
-	const struct mfd_cell *cell = mfd_get_cell(pdev);
-
-	if (!cell->disable) {
-		dev_dbg(&pdev->dev, "No .disable() call-back registered\n");
-		return 0;
-	}
-
-	return cell->disable(pdev);
-}
-EXPORT_SYMBOL(mfd_cell_disable);
-
 #if IS_ENABLED(CONFIG_ACPI)
 struct match_ids_walk_data {
 	struct acpi_device_id *ids;

include/linux/mfd/core.h

@@ -68,9 +68,6 @@ struct mfd_cell {
 	int			id;
 	int			level;
 
-	int			(*enable)(struct platform_device *dev);
-	int			(*disable)(struct platform_device *dev);
-
 	int			(*suspend)(struct platform_device *dev);
 	int			(*resume)(struct platform_device *dev);
 
@@ -123,15 +120,6 @@ struct mfd_cell {
 	const char * const	*parent_supplies;
 };
 
-/*
- * Convenience functions for clients using shared cells.  Refcounting
- * happens automatically, with the cell's enable/disable callbacks
- * being called only when a device is first being enabled or no other
- * clients are making use of it.
- */
-extern int mfd_cell_enable(struct platform_device *pdev);
-extern int mfd_cell_disable(struct platform_device *pdev);
-
 /*
  * Given a platform device that's been created by mfd_add_devices(), fetch
  * the mfd_cell that created it.