From: Tien Fong Chee tien.fong.chee@intel.com
Add a function to find the block device descriptor of the parent device.
Signed-off-by: Tien Fong Chee tien.fong.chee@intel.com --- drivers/block/blk-uclass.c | 23 +++++++++++++++++++++++ include/blk.h | 9 +++++++++ 2 files changed, 32 insertions(+)
diff --git a/drivers/block/blk-uclass.c b/drivers/block/blk-uclass.c index 9e0c823..facf527 100644 --- a/drivers/block/blk-uclass.c +++ b/drivers/block/blk-uclass.c @@ -132,6 +132,29 @@ struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, int devnum) }
/** + * 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 * * @if_type: Interface type diff --git a/include/blk.h b/include/blk.h index 86f6d50..8ba9ab9 100644 --- a/include/blk.h +++ b/include/blk.h @@ -541,6 +541,15 @@ struct blk_desc *blk_get_devnum_by_typename(const char *if_typename, int devnum);
/** + * 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); + +/** * blk_dselect_hwpart() - select a hardware partition * * This selects a hardware partition (such as is supported by MMC). The block