Re: [PATCH v5 1/2] arm64: dts: marvell: Add Armada 98DX2530 SoC and RD-AC5X board

[Chris Packham]

(resend without the html)


On 5/05/22 21:19, Krzysztof Kozlowski wrote:
>> +	core_clock: core_clock {
> No underscores in node names.
>
> All these clocks do not look like real clocks. Where are they if outside
> of SoC? These should be fed from clock controllers, shouldn't they? If
> they are provided by boards, don't put them into SoC...
>
>> +		compatible = "fixed-clock";
>> +		#clock-cells = <0>;
>> +		clock-frequency = <400000000>;
>> +	};
>> +
>> +	axi_clock: axi_clock {
>> +		compatible = "fixed-clock";
>> +		#clock-cells = <0>;
>> +		clock-frequency = <325000000>;
>> +	};
>> +
>> +	spi_clock: spi_clock {
>> +		compatible = "fixed-clock";
>> +		#clock-cells = <0>;
>> +		clock-frequency = <200000000>;
>> +	};

Based on the information I have (which isn't much) there is a ref_clk 
input that is connected to a 25MHz oscillator and then I'm assuming 
these are all generated from that with various dividers. 25MHz is the 
only documented option.

There doesn't appear to be any documented register where I can read out 
the divider ratios. It might be nice I could have the fixed osc node and 
have these 3 clocks derived with fixed divisors but I don't see any what 
of achieving that.