Re: [PATCH v5 3/8] dt-bindings: mfd: realtek,rtd1xxx: Add interrupt controller child node

[Krzysztof Kozlowski]

On 19/10/2026 13:19, Yu-Chun Lin [林祐君] wrote:
> Hi Krzysztof,
> 
>> On Mon, Oct 19, 2026 at 12:06:48AM +0800, Yu-Chun Lin wrote:
>>> Allow an interrupt controller as a child node by referencing the
>>> rtd1319-intc-iso schema, update additionalProperties to
>>> unevaluatedProperties, and append a usage example.
>>
>> I do not see that "update".
>>
> 
> Sorry about this. I updated the diff but missed updating the commit
> message. Will fix.
> 
>>>
>>> Signed-off-by: Yu-Chun Lin <eleanor.lin@xxxxxxxxxxx>
>>> ---
>>>  .../bindings/mfd/realtek,rtd1xxx.yaml         | 28
>> +++++++++++++++++++
>>>  1 file changed, 28 insertions(+)
>>>
>>> diff --git
>>> a/Documentation/devicetree/bindings/mfd/realtek,rtd1xxx.yaml
>>> b/Documentation/devicetree/bindings/mfd/realtek,rtd1xxx.yaml
>>> index 717e29c37b36..b21e14df2879 100644
>>> --- a/Documentation/devicetree/bindings/mfd/realtek,rtd1xxx.yaml
>>> +++ b/Documentation/devicetree/bindings/mfd/realtek,rtd1xxx.yaml
>>> @@ -65,6 +65,10 @@ properties:
>>>      const: 1
>>>
>>>  patternProperties:
>>> +  "^interrupt-controller":
>>> +    $ref: /schemas/interrupt-controller/realtek,rtd1319-intc-iso.yaml
>>> +    unevaluatedProperties: false
>>> +
>>>    '@[0-9a-f]+$':
>>>      type: object
>>
>> What is this for then? Should it be removed?
>>
> 
> The original syscon compatible has other child nodes that do have 'reg'
> properties and unit addresses, so this pattern is still needed for them.
> 
>>>
>>> @@ -76,3 +80,27 @@ required:
>>>    - reg
>>>
>>>  additionalProperties: false
>>> +
>>> +examples:
>>> +  - |
>>> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
>>> +    #include <dt-bindings/interrupt-controller/irq.h>
>>> +
>>> +    syscon@7000 {
>>> +        compatible = "realtek,rtd1625-iso", "syscon", "simple-mfd";
>>> +        reg = <0x7000 0x1000>;
>>> +        ranges = <0x0 0x7000 0x1000>;
>>> +        #address-cells = <1>;
>>> +        #size-cells = <1>;
>>
>> Why do you have cells it your child has no addressing?
>>
>>> +
>>> +        interrupt-controller {
>>
>> So the binding requires children with unit address, yes?
>>
> 
> The interrupt-controller does not need a unit address because it accesses
> the registers via the parent's regmap.

That's not really relevant. Child drivers still access via parent's
regmap and have unit address. This binding has bus addressing for
children, so use it. Do not add random or inconsistent code.

> 
> Will update the example to remove the unnecessary properties from the
> parent as follows:
> 
> syscon@7000 {
>     compatible = "realtek,rtd1625-iso", "syscon", "simple-mfd";
>     reg = <0x7000 0x1000>;
> 

Still incomplete. Where are other devices?


Best regards,
Krzysztof