serial: of-serial: fetch line number from DT

Olof Johansson olof at
Tue Nov 11 08:51:18 PST 2014

On Mon, Nov 10, 2014 at 9:24 PM, Greg Kroah-Hartman
<gregkh at> wrote:
> On Mon, Nov 10, 2014 at 01:34:19PM -0800, Olof Johansson wrote:
>> Greg,
>> This commit:
>> commit 1bd8324535ec1ff44aef55c0e40b9e7d56b310fb
>> Author: Lucas Stach <dev at>
>> Date:   Mon Nov 3 23:16:54 2014 +0100
>>     serial: of-serial: fetch line number from DT
>>     The general agreed way to specify a fixed line number
>>     for a serial console is to provide a "serial" alias
>>     in the devicetree. Start parsing this property in
>>     of_serial.
>>     Signed-off-by: Lucas Stach <dev at>
>>     Signed-off-by: Greg Kroah-Hartman <gregkh at>
>> 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.
>> 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. :(
>> Greg, can you please revert until we get the tegra-side fixes in for
>> this, or we're in for a pretty lousy time w.r.t. bisecting problems
>> across the two mergepoints?
>> 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.
>> Apologies for not replying to the patch directly -- it was only ever
>> posted to linux-serial and I don't seem to be subscribed.
> Now reverted, sorry for the problems.

No worries, it's what linux-next is for. Thanks for the revert!


More information about the linux-arm-kernel mailing list