linux-kernel - Re: [PATCH v1] dt-bindings: opp: Allow multi-worded node names

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Date:   Fri, 22 Oct 2021 10:39:22 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rob Herring <robh@...nel.org>, Viresh Kumar <vireshk@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, Nishanth Menon <nm@...com>,
        David Heidelberg <david@...t.cz>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1] dt-bindings: opp: Allow multi-worded node names

22.10.2021 09:50, Viresh Kumar пишет:
> On 22-10-21, 09:40, Dmitry Osipenko wrote:
>> 22.10.2021 07:43, Viresh Kumar пишет:
>>> On 20-10-21, 09:46, Rob Herring wrote:
>>>> On Wed, Oct 20, 2021 at 02:19:05AM +0300, Dmitry Osipenko wrote:
>>>>> Not all OPP table names and OPP entries consist of a single word. In
>>>>> particular NVIDIA Tegra OPP tables use multi-word names. Allow OPP node
>>>>> and OPP entry name to have multi-worded names to silence DT checker
>>>>> warnings about the multi-word names separated by hyphen.
>>>>>
>>>>> Reviewed-by: David Heidelberg <david@...t.cz>
>>>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>>>>> ---
>>>>>  Documentation/devicetree/bindings/opp/opp-v2-base.yaml | 4 ++--
>>>>>  1 file changed, 2 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/opp/opp-v2-base.yaml b/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
>>>>> index ae3ae4d39843..298cf24af270 100644
>>>>> --- a/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
>>>>> +++ b/Documentation/devicetree/bindings/opp/opp-v2-base.yaml
>>>>> @@ -22,7 +22,7 @@ select: false
>>>>>  
>>>>>  properties:
>>>>>    $nodename:
>>>>> -    pattern: '^opp-table(-[a-z0-9]+)?$'
>>>>> +    pattern: '^opp-table(-[a-z0-9]+)*$'
>>>>
>>>> I don't see how this helps you. What I see needed upstream is a prefix:
>>>>
>>>> '-?opp-table(-[0-9]+)?$'
>>>
>>> I wonder if we should disallow that to keep naming more 
>>
>> I also think that postfix variant should be disallowed for consistency.
>> I sent out patches for both variants.
>>
>> V2 uses pattern that supports both naming schemes. If V2 is less
>> appropriate, then please take this V1.
> 
> I didn't like V2, we can mandate to keep it like opp-* and opp-table-*.
> 
> This patch looked okay to me, lets see what Rob has to say.
> 

What we currently have for Tegra is a tegra-opps.dtsi and tegra.dtsi
which includes the OPP's dtsi.

the tegra-opps.dtsi has this structure:

table: devname-opp-table {
	opp: ...
};

and tegra.dtsi:

#include "tegra-opps.dtsi"

device@...0 {
	operating-points-v2 = <&table>;
};

It just occurred to me that there is no need to move all tables to
tegra.dtsi, but change structure of tegra-opps.dtsi to:

device@...0 {
	operating-points-v2 = <&table>;

	table: opp-table {
		opp: ...
	};
};

Then there no need to change current naming scheme. Let me try to
implement it and see how it goes.