Re: serial: of-serial: fetch line number from DT

On Mon, Nov 10, 2014 at 1:38 PM, Stephen Warren [off-list ref] wrote:

On 11/10/2014 02:34 PM, Olof Johansson wrote:

quoted

Greg,

This commit:

commit 1bd8324535ec1ff44aef55c0e40b9e7d56b310fb
Author: Lucas Stach [off-list ref]
Date:   Mon Nov 3 23:16:54 2014 +0100

     serial: of-serial: fetch line number from DT

...

quoted

Broke a whole lot of tegra boards in last night's -next here. In
particular, I've been looking at tegra20-seaboard, which now doesn't
boot with console any more.

http://arm-soc.lixom.net/bootlogs/next/next-20141110/

Unfortunately, tegra has for a long time been specifying the aliases
as a fixed 1:1 mapping, but most environments rely on ttyS0 being the
first _activated_ serial port. That's obviously going to break things
here. :(

...

quoted

Stephen: I suppose the best way to handle this on tegra is to specify
the aliases per-board instead of in the soc dtsi today.

IIRC, there was a deliberate request to name the Tegra UARTs after the SoC
ports rather than board ports, so that it'd be obvious to people which port
was which. I'm not sure if we can change the aliases in the Tegra DTs now
that people may have got used to them?

I think that's a great idea in general, but they've been this way now
for 4 years and it'll mean everyone changing bootargs and console
configurations (where to spawn getty) everywhere. :(


-Olof