linux-kernel - Re: [PATCH] ARM: dts: vf-colibri: define stdout-path property

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Message-ID: <20150717025553.GA12927@tiger>
Date:	Fri, 17 Jul 2015 10:55:53 +0800
From:	Shawn Guo <shawnguo@...nel.org>
To:	Stefan Agner <stefan@...er.ch>
Cc:	devicetree@...r.kernel.org, shawn.guo@...aro.org,
	linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: vf-colibri: define stdout-path property

On Wed, Jul 15, 2015 at 04:05:50PM +0200, Stefan Agner wrote:
> On 2015-07-13 17:10, Shawn Guo wrote:
> > On Fri, Jul 03, 2015 at 10:06:39AM +0200, Stefan Agner wrote:
> >> Define Vybrid's UART0, connected to the Colibri pinout UART_A, as
> >> standard output.
> >>
> >> Signed-off-by: Stefan Agner <stefan@...er.ch>
> >> ---
> >>  arch/arm/boot/dts/vf-colibri-eval-v3.dtsi | 1 +
> >>  1 file changed, 1 insertion(+)
> >>
> >> diff --git a/arch/arm/boot/dts/vf-colibri-eval-v3.dtsi b/arch/arm/boot/dts/vf-colibri-eval-v3.dtsi
> >> index 2cbe663..cb199ae 100644
> >> --- a/arch/arm/boot/dts/vf-colibri-eval-v3.dtsi
> >> +++ b/arch/arm/boot/dts/vf-colibri-eval-v3.dtsi
> >> @@ -10,6 +10,7 @@
> >>  / {
> >>  	chosen {
> >>  		bootargs = "console=ttyLP0,115200";
> >> +		stdout-path = "serial0:115200n8";
> > 
> > With this change, can bootargs just be dropped?
> 
> I guess it would break a (fairly old) kernel which does not support
> stdout-path yet?

The DT ABI requires that the new kernel doesn't break anything
with old DTB, but doesn't require the compatibility between new DTB
and old kernel.

Shawn
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