Re: [PATCH 1/5] dt-bindings: clock: qcom: Add bindings for PDM GP_MN clock divider

[Taniya Das]

On 6/9/2026 6:55 PM, Konrad Dybcio wrote:
> On 6/2/26 5:21 PM, Taniya Das wrote:
>> Add device tree bindings for the Qualcomm Peripheral Web's PDM GP_MN
>> clock divider. The hardware generates a fractional output frequency
>> from a fixed input clock (typically TCXO4) using the relation
>> Fout = Fin * (M / N), with duty cycle controlled by a separate D
>> register. The clock output is routed over a gpio controlled pin.
>>
>> Signed-off-by: Taniya Das <taniya.das@xxxxxxxxxxxxxxxx>
>> ---
> 
> [...]
>> +  clock-output-names:
>> +    maxItems: 1
> 
> This should be deferred to the driver

Sure.

> 
>> +
>> +  pinctrl-0:
>> +    description: Pin configuration for the GP_MN output in the active state.
>> +
>> +  pinctrl-names:
>> +    items:
>> +      - const: active
> 
> I think these 2 are always allowed/defined

Sure, will remove them.

>> +
>> +  assigned-clocks:
>> +    maxItems: 1
>> +    description: Parent clock phandle used to set the input frequency.
>> +
>> +  assigned-clock-rates:
>> +    maxItems: 1
>> +    description: |
>> +      Rate for the parent clock in Hz.
>> +      Supported rates: 19200000, 9600000, 6400000, 4800000.
> 
> Likewise, we could simply set_rate on the GCC clock which is the
> parent of this one, via something like CLK_SET_RATE_PARENT


The GCC clock could be either at 19.2MHz, 9.6MHz, 6.4MHz, or
4.8MHz(consumer/customer use case dependent) and the output clock at
GP_MND can be a range of frequencies(which are not fixed).

    assigned-clock-rates
            |
            v
     bi_tcxo (19.2 MHz)
            |
            v
          CDIV (1, 2, 3, 4)
            |
            |
            v
      gcc_pdm_xo4_clk (CBC)
            |
 	    +----> 19.2 MHz
            +----> 9.6  MHz
            +----> 6.4  MHz
            +----> 4.8  MHz
            |
            v
         PDM GP_MND (Variable frequency range)

I missed one patch where I didn't add the CLK_SET_RATE_PARENT on the
gcc_pdm_xo4_clk and CDIV(additional) modelling.

-- 
Thanks,
Taniya Das