linux-kernel - Re: [PATCH v3 3/3] arm64: dts: Add mediatek MT8173 earlycon support

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Date:	Wed, 29 Apr 2015 08:19:02 +0000
From:	Vineet Gupta <Vineet.Gupta1@...opsys.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>,
	Eddie Huang <eddie.huang@...iatek.com>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"srv_heupstream@...iatek.com" <srv_heupstream@...iatek.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"Catalin Marinas" <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	"Jiri Slaby" <jslaby@...e.cz>, Howard Chen <ibanezchen@...il.com>,
	Ashwin Chaugule <ashwin.chaugule@...aro.org>,
	Peter Hurley <peter@...leysoftware.com>,
	"Wang Long" <long.wanglong@...wei.com>,
	Kevin Cernekee <cernekee@...il.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Alan Cox <alan@...ux.intel.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>
Subject: Re: [PATCH v3 3/3] arm64: dts: Add mediatek MT8173 earlycon support

On Wednesday 29 April 2015 12:15 PM, Sascha Hauer wrote:
> Hi Eddie,
>
> On Tue, Apr 28, 2015 at 09:40:34PM +0800, Eddie Huang wrote:
>> Add earlycon support to mediatek MT8173 evaluation board dts.
> This is not about earlycon support. It adds the stdout-path property
> which is generally about console.

Indeed, this is shorter way of specifying the default console by referring to uart
device.

>  It only happens to used for earlycon,
> but would be used as a regular console aswell if it wasn't broken for
> some kernel revisisions.

Really - I'm confused. When I last tried this for arc_uart (in 3.17 time frame),
it would setup default console, but to use it for earlycon we needed
bootargs=earlycon in chosen. However I had to revet that change since OF core
still was fixing a few things in that area.

See mainline 22524b02b17b901f28 ("Revert "ARC: [arcfpga] stdout-path now suffices
for earlycon/console"")

-Vineet

>
>>  
>> -	chosen { };
>> +	chosen {
>> +		linux,stdout-path = &uart0;
>> +	};
> Please use stdout-path, without the 'linux,'.
>
> Sascha
>

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