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

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Date:	Thu, 12 Feb 2015 10:36:29 +0100
From:	Michal Simek <michal.simek@...inx.com>
To:	Andreas Färber <afaerber@...e.de>,
	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

On 02/11/2015 07:18 PM, Andreas Färber wrote:
> 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.

Ancient u-boot versions are not using this features. Zynq hasn't been
switched to DM anyway.

>>> 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.

I will solved that conflicts - it is easy one.

Thanks,
Michal


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