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 19:18:18 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	Michal Simek <michal.simek@...inx.com>,
	Mark Rutland <mark.rutland@....com>
CC:	Josh Cartwright <josh.cartwright@...com>,
	"monstr@...str.eu" <monstr@...str.eu>,
	Russell King <linux@....linux.org.uk>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	Kumar Gala <galak@...eaurora.org>,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Ola Jeppsson <ola@...pteva.com>
Subject: Re: [PATCH 2/2] ARM: dts: zynq: Add linux, stdout-path and stdout-path

Am 11.02.2015 um 15:25 schrieb Michal Simek:
> On 02/11/2015 01:40 PM, Mark Rutland wrote:
>> 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"
> 
> let me check this configuration if it is supported by u-boot.

I would be surprised if either is supported - my Parallella ships:
U-Boot 2012.10-00003-g792c31c (Jan 03 2014 - 12:24:08)
and upstream U-Boot still doesn't have support for the Parallella.

>> Which makes the expected configuration explicit without relying on the
>> Linux-specific bootargs.
>>
>> Is there any reason to keep linux,stdout-path?
> 
> Agree when stdout-patch is defined there is no reason to use linux,stdout-patch.

It's not used, it was added on reviewers' request at the time. Feel free
to drop. But again, we are bound for patch conflict here.

Regards,
Andreas

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