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block: Add a function to find block device descriptor

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Add a function to find the block device descriptor of the parent
device.

Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
[trini: Move function declaration to avoid warning]
Signed-off-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Tien Fong Chee 2018-07-06 16:26:36 +08:00 committed by Tom Rini
parent 14dfc6482a
commit bc53d2637e
2 changed files with 32 additions and 0 deletions
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23
drivers/block/blk-uclass.c
View file

@ -131,6 +131,29 @@ struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, int devnum)
return NULL;
}
/**
* blk_get_by_device() - Get the block device descriptor for the given device
* @dev: Instance of a storage device
*
* Return: With block device descriptor on success , NULL if there is no such
* block device.
*/
struct blk_desc *blk_get_by_device(struct udevice *dev)
{
struct udevice *child_dev, *next;
device_foreach_child_safe(child_dev, next, dev) {
if (device_get_uclass_id(child_dev) != UCLASS_BLK)
continue;
return dev_get_uclass_platdata(child_dev);
}
debug("%s: No block device found\n", __func__);
return NULL;
}
/**
* get_desc() - Get the block device descriptor for the given device number
*

9
include/blk.h
View file

@ -406,6 +406,15 @@ int blk_select_hwpart(struct udevice *dev, int hwpart);
*/
int blk_get_from_parent(struct udevice *parent, struct udevice **devp);
/**
* blk_get_by_device() - Get the block device descriptor for the given device
* @dev: Instance of a storage device
*
* Return: With block device descriptor on success , NULL if there is no such
* block device.
*/
struct blk_desc *blk_get_by_device(struct udevice *dev);
#else
#include <errno.h>
/*