[RFC v3 01/18] dt-bindings: clock: Add VO subsystem clock controller support

[Michal Wilczynski]

On 1/21/25 10:47, Krzysztof Kozlowski wrote:
> On Mon, Jan 20, 2025 at 06:20:54PM +0100, Michal Wilczynski wrote:
>>  properties:
>>    compatible:
>> -    const: thead,th1520-clk-ap
>> +    enum:
>> +      - thead,th1520-clk-ap
>> +      - thead,th1520-clk-vo
>>  
>>    reg:
>>      maxItems: 1
>>  
>>    clocks:
>>      items:
>> -      - description: main oscillator (24MHz)
>> +      - description: main oscillator (24MHz) or CLK_VIDEO_PLL
> 
> thead,th1520-clk-ap gets also VIDEO_PLL? Aren't both serving the same
> purpose from these devices point of view? Bindings are telling what this
> device is expecting.

Since thead,th1520-clk-ap configures PLL clocks it takes the oscillator
24MHz as an input, so no.

The VO subsystem takes as an input VIDEO_PLL that's configured by the
AP.

I could do something like this if this needs to be formally expressed in
the schema:

if:
  properties:
    compatible:
      contains:
        const: thead,th1520-clk-ap
then:
  properties:
    clocks:
      description:
        main oscillator (24MHz)

if:
  properties:
    compatible:
      contains:
        const: thead,th1520-clk-vo
then:
  properties:
    clocks:
      description:
        VIDEO_PLL (derived from AP) for the VO clock controller.


> 
>>  
>>    "#clock-cells":
>>      const: 1
>> @@ -51,3 +54,10 @@ examples:
>>          clocks = <&osc>;
>>          #clock-cells = <1>;
>>      };
>> +
>> +    clock-controller at ff010000 {
>> +        compatible = "thead,th1520-clk-vo";
> 
> Difference in one property does not justify new example. If there is
> goign to be resend, just drop.
> 
> 
>> +        reg = <0xff010000 0x1000>;
>> +        clocks = <&clk CLK_VIDEO_PLL>;
>> +        #clock-cells = <1>;
> 
> Best regards,
> Krzysztof
> 
>