diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/dm/device.h | 29 | ||||
| -rw-r--r-- | include/dm/uclass-internal.h | 23 | ||||
| -rw-r--r-- | include/dm/uclass.h | 31 |
3 files changed, 83 insertions, 0 deletions
diff --git a/include/dm/device.h b/include/dm/device.h index 4679979..6005e7e 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 diff --git a/include/dm/uclass-internal.h b/include/dm/uclass-internal.h index 1434db3..f718f37 100644 --- a/include/dm/uclass-internal.h +++ b/include/dm/uclass-internal.h @@ -82,4 +82,27 @@ struct uclass *uclass_find(enum uclass_id key); */ int uclass_destroy(struct uclass *uc); +/** + * uclass_find_device_by_seq() - Find uclass device based on ID and 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. + * + * The device is NOT probed, it is merely returned. + * + * @id: ID to look up + * @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) + * @return 0 if OK, -ve on error + */ +int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq, + bool find_req_seq, struct udevice **devp); + #endif diff --git a/include/dm/uclass.h b/include/dm/uclass.h index afd9923..48ae242 100644 --- a/include/dm/uclass.h +++ b/include/dm/uclass.h @@ -106,6 +106,22 @@ int uclass_get(enum uclass_id key, struct uclass **ucp); int uclass_get_device(enum uclass_id id, int index, struct udevice **devp); /** + * uclass_get_device_by_seq() - Get a uclass device based on an ID and sequence + * + * If an active device has this sequence it will be returned. If there is no + * such device then this will check for a device that is requesting this + * sequence. + * + * The device is probed to activate it ready for use. + * + * @id: ID to look up + * @seq: Sequence number to find (0=first) + * @devp: Returns pointer to device (there is only one for each seq) + * @return 0 if OK, -ve on error + */ +int uclass_get_device_by_seq(enum uclass_id id, int seq, struct udevice **devp); + +/** * uclass_first_device() - Get the first device in a uclass * * @id: Uclass ID to look up @@ -124,6 +140,21 @@ int uclass_first_device(enum uclass_id id, struct udevice **devp); int uclass_next_device(struct udevice **devp); /** + * uclass_resolve_seq() - Resolve a device's sequence number + * + * On entry dev->seq is -1, and dev->req_seq may be -1 (to allocate a + * sequence number automatically, or >= 0 to select a particular number. + * If the requested sequence number is in use, then this device will + * be allocated another one. + * + * Note that the device's seq value is not changed by this function. + * + * @dev: Device for which to allocate sequence number + * @return sequence number allocated, or -ve on error + */ +int uclass_resolve_seq(struct udevice *dev); + +/** * uclass_foreach_dev() - Helper function to iteration through devices * * This creates a for() loop which works through the available devices in |