linux-kernel - Re: [PATCH 06/14] ARM: dts: sun8i: Add cpu0 label to sun8i-h3.dtsi

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Date:	Sat, 25 Jun 2016 00:51:56 +0200
From:	Ondřej Jirman <megous@...ous.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	dev <dev@...ux-sunxi.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Russell King <linux@...linux.org.uk>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/14] ARM: dts: sun8i: Add cpu0 label to sun8i-h3.dtsi

Hello,

comments below.

On 24.6.2016 05:48, Chen-Yu Tsai wrote:
> On Fri, Jun 24, 2016 at 3:20 AM,  <megous@...ous.com> wrote:
>> From: Ondrej Jirman <megous@...ous.com>
>>
>> Add label to the first cpu so that it can be referenced
>> from derived dts files.
>>
>> Signed-off-by: Ondrej Jirman <megous@...ous.com>
>> ---
>>  arch/arm/boot/dts/sun8i-h3.dtsi | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/arch/arm/boot/dts/sun8i-h3.dtsi b/arch/arm/boot/dts/sun8i-h3.dtsi
>> index 9938972..82faefc 100644
>> --- a/arch/arm/boot/dts/sun8i-h3.dtsi
>> +++ b/arch/arm/boot/dts/sun8i-h3.dtsi
>> @@ -52,7 +52,7 @@
>>                 #address-cells = <1>;
>>                 #size-cells = <0>;
>>
>> -               cpu@0 {
>> +               cpu0: cpu@0 {
>>                         compatible = "arm,cortex-a7";
>>                         device_type = "cpu";
>>                         reg = <0>;
> 
> Can you also set the cpu clock here? It is part of the SoC
> and does not belong in the board DTS files.

Do you mean operating-points, or something else? Different SBCs will
probably require different combinations of operating points just for
safety's sake, because they have different regulators and [some have
botched] thermal designs, so it might make sense to customize it for
differnt boards, and I don't feel adventurous enough setting it for all
H3 boards out there.

Or is this comment related to the missing cpu clock rate message I see
on every boot?

[    0.058912] /cpus/cpu@0 missing clock-frequency property

regards,
  Ondrej

> Otherwise this one looks good.
> 
> ChenYu
> 
>> --
>> 2.9.0
>>



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