On 11/11/2014 01:49 PM, Olof Johansson wrote:
There are general changes pending to make the /aliases/serial* entries number the serial ports on the system. On tegra, so far the ports have been just numbered dynamically as they are configured so that makes them change. To avoid this, add specific aliases per board to keep the old numbers. This allows us to change the numbering by default on future SoCs while keeping the numbering on existing boards.
This change seems mostly OK to me. FWIW though, I had suggested this approach when the UART aliases were first added, and Laxman disagreed with it. See commit b6551bb933f9 "ARM: tegra: dts: add aliases and DMA requestor for serial controller", and its discussion: https://lkml.org/lkml/2012/12/25/4. I've CC'd Laxman in case he still objects.
Signed-off-by: Olof Johansson <olof@xxxxxxxxx> --- Stephen/Thierry/Alex, as noticed this week we really should try to get this in before the 3.19 merge window so that the global aliases change can happen there without regression.
How did we resolve the issue that patch causes with old DTs; namely that it causes a change in behaviour for those old DTs? On IRC, I'd wondered whether we should set a flag so the kernel ignored aliases for boards containing currently upstreamed Tegra SoCs so that issue wouldn't occur. If we did that, we wouldn't need this patch.
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