linux-kernel - [PATCH v8 2/9] mfd: core: make platform_data pointer const in struct mfd

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Message-ID: <20240908210803.3339919-3-heiko@sntech.de>
Date: Sun,  8 Sep 2024 23:07:56 +0200
From: Heiko Stuebner <heiko@...ech.de>
To: lee@...nel.org,
	jikos@...nel.org,
	jic23@...nel.org
Cc: robh@...nel.org,
	krzk+dt@...nel.org,
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	Heiko Stuebner <heiko@...ech.de>
Subject: [PATCH v8 2/9] mfd: core: make platform_data pointer const in struct mfd_cell

The content of the platform_data of a struct mfd_cell is simply passed on
to the platform_device_add_data() call in mfd_add_device() .

platform_device_add_data() already handles the data behind that pointer
as const and also uses kmemdup to create a copy of the data before
handing that copy over to the newly created platform-device,
so there is no reason to not extend this to struct mfd_cell, as the old
copy in the mfd_cell will be stale anyway.

This allows to pass structs gathered from of_device_get_match_data()
as platform-data to sub-devices - which is retrieved as const already.

Signed-off-by: Heiko Stuebner <heiko@...ech.de>
---
 include/linux/mfd/core.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index e8bcad641d8c..faeea7abd688 100644
--- a/include/linux/mfd/core.h
+++ b/include/linux/mfd/core.h
@@ -72,7 +72,7 @@ struct mfd_cell {
 	int			(*resume)(struct platform_device *dev);

 	/* platform data passed to the sub devices drivers */
-	void			*platform_data;
+	const void		*platform_data;
 	size_t			pdata_size;

 	/* Matches ACPI */
-- 
2.43.0