The sequence number is unique within the uclass, so state this clearly.
Signed-off-by: Simon Glass sjg@chromium.org ---
Changes in v3: - Add new patch to add a clarifying comment on struct udevice's seq member
Changes in v2: None
doc/driver-model/README.txt | 4 +++- include/dm/device.h | 3 ++- 2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/doc/driver-model/README.txt b/doc/driver-model/README.txt index c435cdc..8dfcf75 100644 --- a/doc/driver-model/README.txt +++ b/doc/driver-model/README.txt @@ -359,7 +359,9 @@ Device Sequence Numbers U-Boot numbers devices from 0 in many situations, such as in the command line for I2C and SPI buses, and the device names for serial ports (serial0, serial1, ...). Driver model supports this numbering and permits devices -to be locating by their 'sequence'. +to be locating by their 'sequence'. This numbering unique identifies a +device in its uclass, so no two devices within a particular uclass can have +the same sequence number.
Sequence numbers start from 0 but gaps are permitted. For example, a board may have I2C buses 0, 1, 4, 5 but no 2 or 3. The choice of how devices are diff --git a/include/dm/device.h b/include/dm/device.h index c24707e..b8d4e7a 100644 --- a/include/dm/device.h +++ b/include/dm/device.h @@ -57,7 +57,8 @@ struct driver_info; * @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) + * @seq: Allocated sequence number for this device (-1 = none). This is set up + * when the device is probed and will be unique within the device's uclass. */ struct udevice { struct driver *driver;