linux-kernel - Re: [PATCH v2 3/4] ARM: dts: exynos5250: Fold common ChromeOS parts into Snow

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Date:	Tue, 29 Jul 2014 08:27:13 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Andreas Färber <afaerber@...e.de>
Cc:	Javier Martinez Canillas <javier@...hile0.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	Stephan van Schaik <stephan@...khronix.com>,
	Vincent Palatin <vpalatin@...omium.org>,
	Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.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>,
	Russell King <linux@....linux.org.uk>,
	"moderated list:ARM/SAMSUNG ARM A..." 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/4] ARM: dts: exynos5250: Fold common ChromeOS parts
 into Snow

Andreas,

On Tue, Jul 29, 2014 at 6:00 AM, Andreas Färber <afaerber@...e.de> wrote:
> Hi Javier and Doug,
>
> Am 25.07.2014 19:02, schrieb Javier Martinez Canillas:
>> On Fri, Jul 25, 2014 at 6:43 PM, Doug Anderson <dianders@...omium.org> wrote:
>>> On Fri, Jul 25, 2014 at 9:35 AM, Javier Martinez Canillas
>>> <javier@...hile0.org> wrote:
>>>> Hello Andreas,
>>>>
>>>> On Fri, Jul 18, 2014 at 7:20 PM, Andreas Färber <afaerber@...e.de> wrote:
>>>>>
>>>>> +       memory {
>>>>> +               reg = <0x40000000 0x80000000>;
>>>>> +       };
>>>>> +
>>>>> +       chosen {
>>>>> +       };
>>>>> +
>>>>
>>>> Is there a reason for an empty chosen node? Same for the Spring DTS.
>>>
>>> I know that the bootloader (U-Boot) fills this in.  I'd have to double
>>> check how the bootloader handles the node not being there to begin
>>> with.
>>
>> Yes, U-Boot fills this but if the node does not exist in the FDT, it
>> creates one. Take a look at fdt_chosen() in common/fdt_support.c [0].
>>
>> So I think it's better to just remove it since is empty.
>
> Hm, in different context it was stated that device trees shouldn't rely
> on bootloader behavior (for a /memory node on Zynq we ended up
> specifying the size cell with the real value despite U-Boot overriding
> it to a lesser value).
>
> Can we instead settle on filling this node with defaults? :)
> bootargs = "console=tty1"; would be my choice for Spring. Would that be
> applicable for Snow as well?

Personally I think that there's not a lot of use for including
bootargs.  Every single person will need different bootargs since
everyone will have a different boot source (eMMC partitioin 0, eMMC
partition3, SD card, USB, etc).  You have to rely on the bootloader
for _something_.


> Not sure how to specify that via linux,stdout-path property.
>
> I believe this would be a follow-up patch either way.

Right


> Since there's at least two series out there trying to fiddle with
> -cros-common.dtsi, including one that drops the slot sub-node of the MMC
> and one that adds CPU power supply, it would be nice if we can get the
> -cros-common parts sorted out and applied. Can you ack/review 1-2?
> Should I squash them in a v3?

Yeah, it will be a fight to see who gets landed first...  :-P

I was thinking you were going to spin the patches and I'd do another
batch of review, but I think I can mark the first two as Reveiwed-by
if it's helpful to you.  Let me do one more double-check when I get to
my desk.

-Doug
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