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Message-ID: <2e77e3b1-00b6-46b9-bfed-7cae3ffa15e9@linaro.org>
Date: Fri, 15 Dec 2023 11:37:40 +0100
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Subject: Re: [PATCH v2 5/5] dt-bindings: net: ipq4019-mdio: Document ipq5332
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To: Jie Luo <quic_luoj@quicinc.com>, Conor Dooley <conor@kernel.org>
Cc: agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org,
 davem@davemloft.net, edumazet@google.com, kuba@kernel.org,
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From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <4b9c56b8-3b29-4861-a3d5-2da26fbc14b4@quicinc.com>
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On 15/12/2023 11:33, Jie Luo wrote:
>>>>>>>>> +  cmn-reference-clock:
>>>>>>>>> +    oneOf:
>>>>>>>>> +      - items:
>>>>>>>>> +          - enum:
>>>>>>>>> +              - 0   # CMN PLL reference internal 48MHZ
>>>>>>>>> +              - 1   # CMN PLL reference external 25MHZ
>>>>>>>>> +              - 2   # CMN PLL reference external 31250KHZ
>>>>>>>>> +              - 3   # CMN PLL reference external 40MHZ
>>>>>>>>> +              - 4   # CMN PLL reference external 48MHZ
>>>>>>>>> +              - 5   # CMN PLL reference external 50MHZ
>>>>>>>>> +              - 6   # CMN PLL reference internal 96MHZ
>>>>>>>>
>>>>>>>> Why is this not represented by an element of the clocks property?
>>>>>>>
>>>>>>> This property is for the reference clock source selection of CMN PLL,
>>>>>>> CMN PLL generates the different clock rates for the different Ethernet
>>>>>>> blocks, this CMN PLL configuration is not located in the GCC, so the
>>>>>>> clock framework can't be used, which is the general hardware register
>>>>>>> instead of RCG register for GCC.
>>>>>>
>>>>>> I don't see how the clock being provided by the "GCC" (whatever that is)
>>>>>> or by some other clock controller or fixed clock makes a difference.
>>>>>> Why can't the other clock provider be represented in the devicetree?
>>>>>>
>>>>>
>>>>> cmn-reference-clock is for selecting the reference clock source for the
>>>>> whole Ethernet block, which is just the standalone configure register.
>>>>
>>>> Sure, you are aware though that all clocks are just configure registers?
>>>>
>>>> Which clocks are these mentioned in the property? From where do they come?
>>>>
>>>> Anyway, property is in existing form is not correct - this is not a
>>>> generic property.
>>>>
>>>
>>> This property cmn-reference-clock is just the hardware register
>>> configuration, since the different IPQ platform needs to select
>>> the different reference clock source for the CMN PLL block that
>>> provides the various clock outputs to the all kinds of Ethernet
>>> devices, which is not from GCC provider.
>>
>> AGAIN: where do the clocks come from? Which device generates them?
> 
> Oh, OK, the reference clock is from wifi that provides 48MHZ to
> Ethernet block.

Then WiFi should be providing you the clock and this device should be
clock consumer, right?


Best regards,
Krzysztof