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Date:	Mon, 5 Jan 2015 13:28:49 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Matthias Brugger <matthias.bgg@...il.com>
Cc:	linux-kernel@...r.kernel.org, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/2] ARM: mediatek: dts: Add uart to Aquaris5

Hi Matthias,

On Fri, Jan 02, 2015 at 07:48:05PM +0100, Matthias Brugger wrote:
> This patch enables uart port for the Aquaris5 mobile phone.
> 
> Signed-off-by: Matthias Brugger <matthias.bgg@...il.com>
> ---
>  arch/arm/boot/dts/mt6589-aquaris5.dts | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/mt6589-aquaris5.dts b/arch/arm/boot/dts/mt6589-aquaris5.dts
> index 0da0470..d5cbfda 100644
> --- a/arch/arm/boot/dts/mt6589-aquaris5.dts
> +++ b/arch/arm/boot/dts/mt6589-aquaris5.dts
> @@ -21,10 +21,16 @@
>  	compatible = "mundoreader,bq-aquaris5", "mediatek,mt6589";
>  
>  	chosen {
> -		bootargs = "earlyprintk";
> +		bootargs = "console=ttyS0,921600n8 earlyprintk";
>  	};

		stdout-path = &uart0;

Should work aswell and makes you independent from the way the kernel
decides to number the UARTs.

>  
>  	memory {
>  		reg = <0x80000000 0x40000000>;
>  	};
> +
> +	soc {
> +		uart0: serial@...06000 {
> +			status = "okay";
> +		};
> +	};

By using the & notation you don't have to resemble the tree structure in
the board file, like this:

&uart0 {
	status = "okay";
};

See for example the omap, i.MX or other dts files.

Sascha

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