serial: of-serial: fetch line number from DT

Greg Kroah-Hartman gregkh at
Mon Nov 10 21:24:07 PST 2014

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.

greg k-h

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