linux-kernel - Re: [PATCH 1/7] ARM: dts: exynos: Add missing memory node for Exynos5440 boards

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Message-ID: <0e8e0b3c-0dd9-c44b-d1ad-03c840d3a725@osg.samsung.com>
Date:   Thu, 1 Sep 2016 11:19:24 +0200
From:   Javier Martinez Canillas <javier@....samsung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Kukjin Kim <kgene@...nel.org>,
        linux-samsung-soc@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 1/7] ARM: dts: exynos: Add missing memory node for
 Exynos5440 boards

Hello Krzysztof,

On 09/01/2016 11:05 AM, Krzysztof Kozlowski wrote:
> On 09/01/2016 10:43 AM, Javier Martinez Canillas wrote:
>>>> --- a/arch/arm/boot/dts/exynos5440-ssdk5440.dts
>>>> +++ b/arch/arm/boot/dts/exynos5440-ssdk5440.dts
>>>> @@ -21,6 +21,11 @@
>>>>  		bootargs = "root=/dev/sda2 rw rootwait ignore_loglevel earlyprintk no_console_suspend mem=2048M@...0000000 mem=6144M@...00000000 console=ttySAC0,115200";
>>>>  	};
>>>>  
>>>> +	memory {
>>>> +		device_type = "memory";
>>>> +		reg = <0 0>;
>>>> +	};
>>>
>>> This looks okay, but the default size and address cells won't be
>>> present. Won't that be a problem?
>>>
>>
>> They will be present since at this point exynos5440.dtsi is still including
>> exynos5440.dtsi, we are just overriding the memory node with the same values
>> than skeleton.dtsi so this can be removed later in patch 7/7.
> 
> I don't get it. exynos5440.dtsi does not set size/address cells in top node.
>

Sorry, maybe I'm misunderstanding your question. The size/address cells are set
in the top node by exynos5440.dtsi including the skeleton.dtsi (since these are
set in that included dtsi).

IOW, scripts/dtc/dtx_diff doesn't show differences for these exynos5440 DTB
before and after $SUBJECT.

> Best regards,
> Krzysztof
> 

Best regards,
-- 
Javier Martinez Canillas
Open Source Group
Samsung Research America