linux-kernel - Re: [PATCH 13/18] dt-bindings: fix jz4780-nemc issue as reported by dtbscheck

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Date:   Sat, 9 Apr 2022 15:09:19 +0200
From:   "H. Nikolaus Schaller" <hns@...delico.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mips@...r.kernel.org, letux-kernel@...nphoenux.org
Subject: Re: [PATCH 13/18] dt-bindings: fix jz4780-nemc issue as reported by
 dtbscheck



> Am 09.04.2022 um 13:26 schrieb Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>:
> 
> On 08/04/2022 20:37, H. Nikolaus Schaller wrote:
>> jz4780-nemc needs to be compatible to simple-mfd as well or we get
>> 
>> arch/mips/boot/dts/ingenic/ci20.dtb: memory-controller@...10000: compatible: 'oneOf' conditional failed, one must be fixed:
>> 	['ingenic,jz4780-nemc', 'simple-mfd'] is too long
>> 	'ingenic,jz4725b-nemc' was expected
>> 	'ingenic,jz4740-nemc' was expected
>> 	From schema: Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml
>> 
>> Signed-off-by: H. Nikolaus Schaller <hns@...delico.com>
>> ---
>> .../devicetree/bindings/memory-controllers/ingenic,nemc.yaml    | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml b/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml
>> index 24f9e19820282..3b1116588de3d 100644
>> --- a/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml
>> +++ b/Documentation/devicetree/bindings/memory-controllers/ingenic,nemc.yaml
>> @@ -17,7 +17,7 @@ properties:
>>     oneOf:
>>       - enum:
>>           - 
>> -          - ingenic,jz4780-nemc
>> +          - [ , simple-mfd ]
> 
> This is not correct representation. If you really need simple-mfd, then
> this should be a separate item below oneOf.

Well, it is valid YAML syntax and seems to be accepted by dtbscheck.

> The true question is whether you need simple-mfd. Isn't the binding (and
> the driver) expected to instantiate its children?

I had expected that but current ingenic,jz4780-nemc code doesn't.

Everything is explained in 190607f2d59e174bcf8415efb1bb390737f8d428

But if someone writes a fix for the ingenic,jz4740-nemc driever
we can of course live without this patch. And partially revert
190607f2d59e174bcf8415efb1bb390737f8d428