[U-Boot] [PATCH v3 17/29] dm: Introduce device sequence numbering

[Simon Glass]

On 23 July 2014 13:55, Simon Glass <sjg at chromium.org> wrote:
> In U-Boot it is pretty common to number devices from 0 and access them
> on the command line using this numbering. While it may come to pass that
> we will move away from this numbering, the possibility seems remote at
> present.
>
> Given that devices within a uclass will have an implied numbering, it
> makes sense to build this into driver model as a core feature. The cost
> is fairly small in terms of code and data space.
>
> With each uclass having numbered devices we can ask for SPI port 0 or
> serial port 1 and receive a single device.
>
> Devices typically request a sequence number using aliases in the device
> tree. These are resolved when the device is probed, to deal with conflicts.
> Sequence numbers need not be sequential and holes are permitted.
>
> At present there is no support for sequence numbers using static platform
> data. It could easily be added to 'struct driver_info' if needed, but it
> seems better to add features as we find a use for them, and the use of -1
> to mean 'no sequence' makes the default value somewhat painful.
>
> Signed-off-by: Simon Glass <sjg at chromium.org>

Applied to dm/master.