linux-kernel - Re: [PATCH 1/7] ARM: dts: s5pv210: Split memory nodes to match spec

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Date:   Wed, 23 Mar 2022 07:59:12 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     Krzysztof Kozlowski <krzk@...nel.org>, alim.akhtar@...sung.com
Cc:     robh+dt@...nel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] ARM: dts: s5pv210: Split memory nodes to match spec

Hi Krzysztof,

On 2022-03-23 3:54 a.m., Krzysztof Kozlowski wrote:
> On 22/03/2022 21:11, Jonathan Bakker wrote:
>> Memory nodes should only have a singular reg property in them, so
>> split the memory nodes such that there is only per node.
>>
>> Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
>> ---
>>  arch/arm/boot/dts/s5pv210-aquila.dts |  8 ++++++--
>>  arch/arm/boot/dts/s5pv210-aries.dtsi | 14 +++++++++++---
>>  arch/arm/boot/dts/s5pv210-goni.dts   | 14 +++++++++++---
>>  3 files changed, 28 insertions(+), 8 deletions(-)
>>
>> diff --git a/arch/arm/boot/dts/s5pv210-aquila.dts b/arch/arm/boot/dts/s5pv210-aquila.dts
>> index 6423348034b6..6984479ddba3 100644
>> --- a/arch/arm/boot/dts/s5pv210-aquila.dts
>> +++ b/arch/arm/boot/dts/s5pv210-aquila.dts
>> @@ -29,8 +29,12 @@
>>  
>>  	memory@...00000 {
>>  		device_type = "memory";
>> -		reg = <0x30000000 0x05000000
>> -			0x40000000 0x18000000>;
>> +		reg = <0x30000000 0x05000000>;
>> +	};
>> +
>> +	memory@...00000 {
>> +		device_type = "memory";
>> +		reg = <0x40000000 0x18000000>;
>>  	};
>>  
>>  	pmic_ap_clk: clock-0 {
>> diff --git a/arch/arm/boot/dts/s5pv210-aries.dtsi b/arch/arm/boot/dts/s5pv210-aries.dtsi
>> index 160f8cd9a68d..70ff56daf4cb 100644
>> --- a/arch/arm/boot/dts/s5pv210-aries.dtsi
>> +++ b/arch/arm/boot/dts/s5pv210-aries.dtsi
>> @@ -24,9 +24,17 @@
>>  
>>  	memory@...00000 {
>>  		device_type = "memory";
>> -		reg = <0x30000000 0x05000000
>> -			0x40000000 0x10000000
>> -			0x50000000 0x08000000>;
> 
> 0x40000000 to 0x58000000 is continues, so I wonder why it is split? Look
> at Aquila DTS.
> 
> 

Yes, it was split in the vendor kernel as well [1], and that's been continued along
here.  I personally don't see a reason to keep it split, but there might be something
I'm not aware of.

Thanks,
Jonathan

[1] https://github.com/xc-racer99/blastoff_kernel_samsung_galaxys4g/blob/gingerbread/arch/arm/mach-s5pv210/mach-herring.c#L4116

> 
> Best regards,
> Krzysztof
>