diff options
Diffstat (limited to 'include/dm/device.h')
| -rw-r--r-- | include/dm/device.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/include/dm/device.h b/include/dm/device.h index 46799795e4..6005e7eeb5 100644 --- a/include/dm/device.h +++ b/include/dm/device.h @@ -55,6 +55,8 @@ struct driver_info; * @child_head: List of children of this device * @sibling_node: Next device in list of all devices * @flags: Flags for this device DM_FLAG_... + * @req_seq: Requested sequence number for this device (-1 = any) + * @seq: Allocated sequence number for this device (-1 = none) */ struct udevice { struct driver *driver; @@ -69,8 +71,13 @@ struct udevice { struct list_head child_head; struct list_head sibling_node; uint32_t flags; + int req_seq; + int seq; }; +/* Maximum sequence number supported */ +#define DM_MAX_SEQ 999 + /* Returns the operations for a device */ #define device_get_ops(dev) (dev->driver->ops) @@ -161,4 +168,26 @@ void *dev_get_platdata(struct udevice *dev); */ void *dev_get_priv(struct udevice *dev); +/** + * device_find_child_by_seq() - Find a child device based on a sequence + * + * This searches for a device with the given seq or req_seq. + * + * For seq, if an active device has this sequence it will be returned. + * If there is no such device then this will return -ENODEV. + * + * For req_seq, if a device (whether activated or not) has this req_seq + * value, that device will be returned. This is a strong indication that + * the device will receive that sequence when activated. + * + * @parent: Parent device + * @seq_or_req_seq: Sequence number to find (0=first) + * @find_req_seq: true to find req_seq, false to find seq + * @devp: Returns pointer to device (there is only one per for each seq). + * Set to NULL if none is found + * @return 0 if OK, -ve on error + */ +int device_find_child_by_seq(struct udevice *parent, int seq_or_req_seq, + bool find_req_seq, struct udevice **devp); + #endif |