linux-kernel - Re: [Patch v5 3/4] dt-bindings: memory: Update reg maxitems for tegra186

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Date:   Tue, 22 Mar 2022 23:42:35 +0530
From:   Ashish Mhetre <amhetre@...dia.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        robh+dt@...nel.org, thierry.reding@...il.com, digetx@...il.com,
        jonathanh@...dia.com, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-tegra@...r.kernel.org
Cc:     vdumpa@...dia.com, Snikam@...dia.com
Subject: Re: [Patch v5 3/4] dt-bindings: memory: Update reg maxitems for
 tegra186



On 3/20/2022 6:12 PM, Krzysztof Kozlowski wrote:
> External email: Use caution opening links or attachments
> 
> 
> On 16/03/2022 10:25, Ashish Mhetre wrote:
>>  From tegra186 onwards, memory controller support multiple channels.
>> Reg items are updated with address and size of these channels.
>> Tegra186 has overall 5 memory controller channels. Tegra194 and tegra234
>> have overall 17 memory controller channels each.
>> There is 1 reg item for memory controller stream-id registers.
>> So update the reg maxItems to 18 in tegra186 devicetree documentation.
>>
>> Signed-off-by: Ashish Mhetre <amhetre@...dia.com>
>> ---
>>   .../nvidia,tegra186-mc.yaml                   | 20 +++++++++++++------
>>   1 file changed, 14 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra186-mc.yaml b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra186-mc.yaml
>> index 13c4c82fd0d3..3c4e231dc1de 100644
>> --- a/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra186-mc.yaml
>> +++ b/Documentation/devicetree/bindings/memory-controllers/nvidia,tegra186-mc.yaml
>> @@ -34,8 +34,8 @@ properties:
>>             - nvidia,tegra234-mc
>>
>>     reg:
>> -    minItems: 1
>> -    maxItems: 3
>> +    minItems: 6
>> +    maxItems: 18
> 
> Still ABI break and now the in-kernel DTS will report dt check errors.
> 
The dt check error is because I mistakenly updated example in EMC node
instead of MC. I'll fix it in next version.

> I think you ignored the comments you got about breaking ABI.
> 
No, I took care of the ABI break in v5. I have updated details about
how we took care of it in first patch.

> Best regards,
> Krzysztof