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-rw-r--r--include/dm/device.h29
-rw-r--r--include/dm/uclass-internal.h23
-rw-r--r--include/dm/uclass.h31
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