On 15.06.22 21:42, Rafał Miłecki wrote:
From: Rafał Miłecki rafal@milecki.pl
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).
Signed-off-by: Rafał Miłecki rafal@milecki.pl Acked-by: Miquel Raynal miquel.raynal@bootlin.com
Reviewed-by: Ahmad Fatoum a.fatoum@pengutronix.de
V3: First introduction of of_get_mtd_device_by_node() V4: Use EPROBE_DEFER
Srinivas: in V3 Miquel said it's OK to push this patch through NVMEM
drivers/mtd/mtdcore.c | 28 ++++++++++++++++++++++++++++ include/linux/mtd/mtd.h | 1 + 2 files changed, 29 insertions(+)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 9eb0680db312..3613cc142f25 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -1154,6 +1154,34 @@ 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
diff --git a/include/linux/mtd/mtd.h b/include/linux/mtd/mtd.h index 955aee14b0f7..6fc841ceef31 100644 --- a/include/linux/mtd/mtd.h +++ b/include/linux/mtd/mtd.h @@ -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);