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 09:02:48 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Ondřej Jirman <megous@...ous.com>
Cc:	Chen-Yu Tsai <wens@...e.org>, 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

On Sat, Jun 25, 2016 at 6:51 AM, Ondřej Jirman <megous@...ous.com> wrote:
> 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.

I meant clocks = <...> and clock-latency = <...>.

These 2 are part of the SoC.

The OPP can stay in the board files. It's a pity there's no standard
OPP table for H3 though. :(

ChenYu

>
> 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
>>>
>