linux-kernel - Re: [PATCH 2/2] ARM: dts: zynq: Add linux,stdout-path and stdout-path

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Date:	Wed, 11 Feb 2015 12:40:27 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Michal Simek <michal.simek@...inx.com>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"monstr@...str.eu" <monstr@...str.eu>,
	Josh Cartwright <josh.cartwright@...com>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	Rob Herring <robherring2@...il.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] ARM: dts: zynq: Add linux,stdout-path and stdout-path

On Wed, Feb 11, 2015 at 12:29:02PM +0000, Michal Simek wrote:
> parallella - Use reference instead of hardcoded path
>              (linux,stdout-path)
> 
> stdout-path is used by bootloader to identify console.
> 
> Signed-off-by: Michal Simek <michal.simek@...inx.com>
> ---
> 
> U-Boot driver model requires stdout-path.
> ---
>  arch/arm/boot/dts/zynq-parallella.dts | 3 ++-
>  arch/arm/boot/dts/zynq-zc702.dts      | 2 ++
>  arch/arm/boot/dts/zynq-zc706.dts      | 2 ++
>  arch/arm/boot/dts/zynq-zed.dts        | 2 ++
>  arch/arm/boot/dts/zynq-zybo.dts       | 2 ++
>  5 files changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/zynq-parallella.dts b/arch/arm/boot/dts/zynq-parallella.dts
> index 6a5f51daa708..45228a427006 100644
> --- a/arch/arm/boot/dts/zynq-parallella.dts
> +++ b/arch/arm/boot/dts/zynq-parallella.dts
> @@ -35,7 +35,8 @@
>  
>  	chosen {
>  		bootargs = "console=ttyPS0,115200 earlyprintk root=/dev/mmcblk0p2 rootfstype=ext4 rw rootwait";
> -		linux,stdout-path = "/amba/serial@...01000";
> +		linux,stdout-path = &uart1;
> +		stdout-path = &uart1;

Given that you added aliases in the last patch, you can use that to
refer to the serial:

	stdout-path - "serial0:115200n8";

With or without the alias you can encode the UART configuration here
too:

	stdout-path = "/amba/serial@...01000:115200n8"

Which makes the expected configuration explicit without relying on the
Linux-specific bootargs.

Is there any reason to keep linux,stdout-path?

Thanks,
Mark.
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