linux-kernel - Re: [PATCH 2/3] dt-bindings: mtd: ti,elm: Add support for AM64 ELM

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Date:   Fri, 25 Mar 2022 13:27:59 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Roger Quadros <rogerq@...nel.org>, miquel.raynal@...tlin.com,
        robh+dt@...nel.org
Cc:     richard@....at, vigneshr@...com, kishon@...com, nm@...com,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] dt-bindings: mtd: ti,elm: Add support for AM64 ELM

On 25/03/2022 13:13, Roger Quadros wrote:
> 
> 
> On 25/03/2022 14:08, Krzysztof Kozlowski wrote:
>> On 25/03/2022 13:05, Roger Quadros wrote:
>>>
>>>
>>> On 24/03/2022 20:26, Krzysztof Kozlowski wrote:
>>>> On 23/03/2022 12:18, Roger Quadros wrote:
>>>>> TI's AM64 SoC has the Error Locator Module. Add compatible and
>>>>> related properties to support ELM on AM64 SoC.
>>>>>
>>>>> Signed-off-by: Roger Quadros <rogerq@...nel.org>
>>>>> ---
>>>>>  .../devicetree/bindings/mtd/ti,elm.yaml       | 27 ++++++++++++++++++-
>>>>>  1 file changed, 26 insertions(+), 1 deletion(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/mtd/ti,elm.yaml b/Documentation/devicetree/bindings/mtd/ti,elm.yaml
>>>>> index 24ed0fb84204..bc01d35ce605 100644
>>>>> --- a/Documentation/devicetree/bindings/mtd/ti,elm.yaml
>>>>> +++ b/Documentation/devicetree/bindings/mtd/ti,elm.yaml
>>>>> @@ -17,7 +17,9 @@ description:
>>>>>  properties:
>>>>>    compatible:
>>>>>      items:
>>>>> -      - const: ti,am3352-elm
>>>>> +      - enum:
>>>>> +          - ti,am3352-elm
>>>>> +          - ti,am64-elm
>>>>>  
>>>>>    reg:
>>>>>      maxItems: 1
>>>>> @@ -25,6 +27,17 @@ properties:
>>>>>    interrupts:
>>>>>      maxItems: 1
>>>>>  
>>>>> +  clocks:
>>>>> +    maxItems: 1
>>>>> +    description: Functional clock.
>>>>> +
>>>>> +  clock-names:
>>>>> +    items:
>>>>> +      - const: fck
>>>>> +
>>>>> +  power-domains:
>>>>> +    maxItems: 1
>>>>> +
>>>>>    ti,hwmods:
>>>>>      description:
>>>>>        Name of the HWMOD associated with ELM. This is for legacy
>>>>> @@ -37,6 +50,18 @@ required:
>>>>>    - reg
>>>>>    - interrupts
>>>>>  
>>>>> +allOf:
>>>>> +  - if:
>>>>> +      properties:
>>>>> +        compatible:
>>>>> +          contains:
>>>>> +            const: ti,am64-elm
>>>>> +    then:
>>>>> +      required:
>>>>> +        - clocks
>>>>> +        - clock-names
>>>>> +        - power-domains
>>>>
>>>> Are these new properties also valid for am3352?
>>>
>>> No they are not required for am3352-elm. Only required for K3 based platforms like AM64.
>>>
>>
>> I understand they are not required, but I asked if they are valid. IOW,
>> whether ELM in am3352 also is part of power domain and has clock input?
> 
> Yes it does have power and clock domains but they are handled a bit differently
> on AM335x platform. i.e. in the parent node

Then I guess it can stay like this. Otherwise (if there is no clock
input) "else:" with "clocks:false" would be expected.


Best regards,
Krzysztof