linux-kernel - Re: [PATCH v2 5/5] dt-bindings: net: ipq4019-mdio: Document ipq5332 platform

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Date: Fri, 15 Dec 2023 18:33:01 +0800
From: Jie Luo <quic_luoj@...cinc.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Conor Dooley
	<conor@...nel.org>
CC: <agross@...nel.org>, <andersson@...nel.org>, <konrad.dybcio@...aro.org>,
        <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>,
        <robert.marko@...tura.hr>, <linux-arm-msm@...r.kernel.org>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <quic_srichara@...cinc.com>
Subject: Re: [PATCH v2 5/5] dt-bindings: net: ipq4019-mdio: Document ipq5332
 platform



On 12/15/2023 6:19 PM, Krzysztof Kozlowski wrote:
> On 15/12/2023 10:49, Jie Luo wrote:
>>
>>
>> On 12/15/2023 3:29 PM, Krzysztof Kozlowski wrote:
>>> On 15/12/2023 07:46, Jie Luo wrote:
>>>>
>>>>
>>>> On 12/15/2023 1:12 AM, Conor Dooley wrote:
>>>>> On Wed, Dec 13, 2023 at 04:26:56PM +0800, Jie Luo wrote:
>>>>>>
>>>>>>
>>>>>> On 12/13/2023 12:06 AM, Conor Dooley wrote:
>>>>>>> On Tue, Dec 12, 2023 at 07:51:50PM +0800, Luo Jie wrote:
>>>>>>>> Update the yaml file for the new DTS properties.
>>>>>>>>
>>>>>>>> 1. cmn-reference-clock for the CMN PLL source clock select.
>>>>>>>> 2. clock-frequency for MDIO clock frequency config.
>>>>>>>> 3. add uniphy AHB & SYS GCC clocks.
>>>>>>>> 4. add reset-gpios for MDIO bus level reset.
>>>>>>>>
>>>>>>>> Signed-off-by: Luo Jie <quic_luoj@...cinc.com>
>>>>>>>> ---
>>>>>>>>      .../bindings/net/qcom,ipq4019-mdio.yaml       | 157 +++++++++++++++++-
>>>>>>>>      1 file changed, 153 insertions(+), 4 deletions(-)
>>>>>>>>
>>>>>>>> diff --git a/Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml b/Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml
>>>>>>>> index 3407e909e8a7..9546a6ad7841 100644
>>>>>>>> --- a/Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml
>>>>>>>> +++ b/Documentation/devicetree/bindings/net/qcom,ipq4019-mdio.yaml
>>>>>>>> @@ -20,6 +20,8 @@ properties:
>>>>>>>>                - enum:
>>>>>>>>                    - qcom,ipq6018-mdio
>>>>>>>>                    - qcom,ipq8074-mdio
>>>>>>>> +              - qcom,ipq9574-mdio
>>>>>>>> +              - qcom,ipq5332-mdio
>>>>>>>>                - const: qcom,ipq4019-mdio
>>>>>>>>        "#address-cells":
>>>>>>>> @@ -30,19 +32,71 @@ properties:
>>>>>>>>        reg:
>>>>>>>>          minItems: 1
>>>>>>>> -    maxItems: 2
>>>>>>>> +    maxItems: 5
>>>>>>>>          description:
>>>>>>>> -      the first Address and length of the register set for the MDIO controller.
>>>>>>>> -      the second Address and length of the register for ethernet LDO, this second
>>>>>>>> -      address range is only required by the platform IPQ50xx.
>>>>>>>> +      the first Address and length of the register set for the MDIO controller,
>>>>>>>> +      the optional second, third and fourth address and length of the register
>>>>>>>> +      for ethernet LDO, these three address range are required by the platform
>>>>>>>> +      IPQ50xx/IPQ5332/IPQ9574, the last address and length is for the CMN clock
>>>>>>>> +      to select the reference clock.
>>>>>>>> +
>>>>>>>> +  reg-names:
>>>>>>>> +    minItems: 1
>>>>>>>> +    maxItems: 5
>>>>>>>>        clocks:
>>>>>>>> +    minItems: 1
>>>>>>>>          items:
>>>>>>>>            - description: MDIO clock source frequency fixed to 100MHZ
>>>>>>>> +      - description: UNIPHY0 AHB clock source frequency fixed to 100MHZ
>>>>>>>> +      - description: UNIPHY1 AHB clock source frequency fixed to 100MHZ
>>>>>>>> +      - description: UNIPHY0 SYS clock source frequency fixed to 24MHZ
>>>>>>>> +      - description: UNIPHY1 SYS clock source frequency fixed to 24MHZ
>>>>>>>>        clock-names:
>>>>>>>> +    minItems: 1
>>>>>>>>          items:
>>>>>>>>            - const: gcc_mdio_ahb_clk
>>>>>>>> +      - const: gcc_uniphy0_ahb_clk
>>>>>>>> +      - const: gcc_uniphy1_ahb_clk
>>>>>>>> +      - const: gcc_uniphy0_sys_clk
>>>>>>>> +      - const: gcc_uniphy1_sys_clk
>>>>>>>
>>>>>>>> +  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.

> 
>>
>> This is indeed not a generic property, which is the Ethernet
>> function configs same as clock-frequency.
> 
> 
> Then it should not be made as a generic property...

sure, i saw your another comments, will prefix qcom_ on this property.

> 
> 
> 
> Best regards,
> Krzysztof
>