linux-kernel - [PATCH RESEND] mfd: Remove .enable() and .disable() callbacks

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Date:   Wed,  8 Mar 2023 10:12:57 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Lee Jones <lee@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel@...gutronix.de,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH RESEND] mfd: 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
652719b1003a ("w1: remove ds1wm driver") the last user is gone. The
corresponding functions mfd_cell_enable() and mfd_cell_disable() are
also unused (since commit 0ca222c81977 ("leds: Remove asic3 driver")).

Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/mfd/mfd-core.c   | 26 --------------------------
 include/linux/mfd/core.h | 12 ------------
 2 files changed, 38 deletions(-)

Hello,

this patch was already sent in January. Back then however there were
still a few drivers making use of the enable and disable calls. In
v6.3-rc1 these are gone now and so it should be safe to apply this
patch.

The comment "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." is wrong. Should we
consider this patch a fix then? :-)

Best regards
Uwe

diff --git a/drivers/mfd/mfd-core.c b/drivers/mfd/mfd-core.c
index 16d1861e9682..695d50b3bac6 100644
--- a/drivers/mfd/mfd-core.c
+++ b/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;
diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index 14ca7b471576..dac04793e194 100644
--- a/include/linux/mfd/core.h
+++ b/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 {
 	int			num_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.

base-commit: fe15c26ee26efa11741a7b632e9f23b01aca4cc6
-- 
2.39.1