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| author | Simon Glass <sjg@chromium.org> | 2014-10-14 05:41:51 (GMT) |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2014-10-22 16:36:46 (GMT) |
| commit | 547cea19b875ce83cc7c14ae750eca4973dab555 (patch) | |
| tree | e4d9c7acf5ba6f26ba7a81ad024e4af00fd25756 /doc/driver-model | |
| parent | accd4b19b39bde7398aa8d1a8eeb66f3a14dde5b (diff) | |
| download | u-boot-fsl-qoriq-547cea19b875ce83cc7c14ae750eca4973dab555.tar.xz | |
dm: core: Add a clarifying comment on struct udevice's seq member
The sequence number is unique within the uclass, so state this clearly.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
Diffstat (limited to 'doc/driver-model')
| -rw-r--r-- | doc/driver-model/README.txt | 4 |
1 files changed, 3 insertions, 1 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 |