mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-30 06:10:56 +00:00
Code Issues Releases Wiki Activity

mtd: allow getting MTD device associated with a specific DT node

Browse source 
MTD subsystem API allows interacting with MTD devices (e.g. reading,
writing, handling bad blocks). So far a random driver could get MTD
device only by its name (get_mtd_device_nm()). This change allows
getting them also by a DT node.

This API is required for drivers handling DT defined MTD partitions in a
specific way (e.g. U-Boot (sub)partition with environment variables).

Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20220916122100.170016-3-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rafał Miłecki 2022-09-16 13:20:49 +01:00 committed by Greg Kroah-Hartman
parent d5542923f2
commit 4a575865c1
2 changed files with 29 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

28
drivers/mtd/mtdcore.c
View file

@ -1217,6 +1217,34 @@ int __get_mtd_device(struct mtd_info *mtd)
}
EXPORT_SYMBOL_GPL(__get_mtd_device);
/**
* of_get_mtd_device_by_node - obtain an MTD device associated with a given node
*
* @np: device tree node
*/
struct mtd_info *of_get_mtd_device_by_node(struct device_node *np)
{
struct mtd_info *mtd = NULL;
struct mtd_info *tmp;
int err;
mutex_lock(&mtd_table_mutex);
err = -EPROBE_DEFER;
mtd_for_each_device(tmp) {
if (mtd_get_of_node(tmp) == np) {
mtd = tmp;
err = __get_mtd_device(mtd);
break;
}
}
mutex_unlock(&mtd_table_mutex);
return err ? ERR_PTR(err) : mtd;
}
EXPORT_SYMBOL_GPL(of_get_mtd_device_by_node);
/**
* get_mtd_device_nm - obtain a validated handle for an MTD device by
* device name

1
include/linux/mtd/mtd.h
View file

@ -677,6 +677,7 @@ extern int mtd_device_unregister(struct mtd_info *master);
extern struct mtd_info *get_mtd_device(struct mtd_info *mtd, int num);
extern int __get_mtd_device(struct mtd_info *mtd);
extern void __put_mtd_device(struct mtd_info *mtd);
extern struct mtd_info *of_get_mtd_device_by_node(struct device_node *np);
extern struct mtd_info *get_mtd_device_nm(const char *name);
extern void put_mtd_device(struct mtd_info *mtd);