RE: [PATCH v2 2/3] dt-bindings: mfd: Add Realtek MISC system controller

[Yu-Chun Lin [林祐君]]

> On 17/11/2025 13:41, Yu-Chun Lin [林祐君] wrote:
> >>>
> >>
> >> None of them. You need SoC specific compatibles which can be used as
> >> fallbacks for SoC specific compatibles. There is plenty of examples
> >> for this already, but anyway this does not solve the problem that you
> >> still did not properly describe the hardware but instead use your
> >> downstream as arguments.
> >>
> >> This will get you nowhere.
> >
> > To implement this fallback structure, my understanding is that the
> > SoC-level DTSI should override the node and prepend its SoC-specific
> > Compatible, while the common DTSI only provides the family-level
> > compatible.
> >
> > /* common DTSI */
> > misc: syscon@... {
> >     compatible = "realtek,kent-misc", "syscon", "simple-mfd";
> 
> No. You changed nothing. How does this differ from options I disagreed with?
> 
> Anyway, there is no such SoC as "kent" and I was clear - you need SoC
> compatibles.
> 
> Define what is your SoC first.
> 
> Best regards,
> Krzysztof

Hi Krzysztof,

Thank you for your response.

The original intention was to add a basic Kent device tree, but since the
'misc' node is currently empty. I will remove both this device node and
its corresponding YAML binding in v3.

After further consideration within our team, we have decided to add
power-domain and reboot-mode functionalities to the 'misc' node in the
future. And we will adhere to the SoC-specific compatible string binding
pattern, following this structure:

/* schema binding */
compatible:
  items:
    - enum:
        - realtek,rtd1501-misc
        - realtek,rtd1861-misc
        - realtek,rtd1920-misc
    - const: syscon
    - const: simple-mfd

/* SoC-specific Device Tree Source (e.g. rtd1920s.dtsi) */

&rbus {
  misc: syscon@7000 {
    compatible = "realtek,rtd1920-misc", "syscon", "simple-mfd";
    reg = <0x7000 0x1000>;
    ranges = <0x0 0x7000 0x1000>;
    #address-cells = <1>;
    #size-cells = <1>;
  };
};

Best regards,
Yu-Chun