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@sntech.de>
Link: https://lore.kernel.org/r/20241107114712.538976-3-heiko@sntech.de
Signed-off-by: Lee Jones <lee@kernel.org>

diff --git a/include/linux/mfd/core.h b/include/linux/mfd/core.h
index e8bcad641d8c20bb87d68627346741d7e86b5e0d..faeea7abd688f223fb0b31cde0a9b69dfe2a61ff 100644 (file)
--- 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 */