linux-kernel - Re: [PATCH net-next v2] dt-bindings: net: ath11k: document the inputs of the ath11k on WCN6855

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Message-ID: <c6fba73f-7bef-480b-b4c8-fb01cd2286e0@kernel.org>
Date: Thu, 5 Sep 2024 23:27:30 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Kalle Valo <kvalo@...nel.org>, Bartosz Golaszewski <brgl@...ev.pl>
Cc: "David S . Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jeff Johnson <jjohnson@...nel.org>,
 linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
 devicetree@...r.kernel.org, ath11k@...ts.infradead.org,
 linux-kernel@...r.kernel.org,
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH net-next v2] dt-bindings: net: ath11k: document the inputs
 of the ath11k on WCN6855

On 05/09/2024 20:28, Kalle Valo wrote:
> Bartosz Golaszewski <brgl@...ev.pl> writes:
> 
>> On Thu, Sep 5, 2024 at 5:47 PM Kalle Valo <kvalo@...nel.org> wrote:
>>>
>>> Bartosz Golaszewski <brgl@...ev.pl> writes:
>>>
>>>>>> +  - if:
>>>>>> +      properties:
>>>>>> +        compatible:
>>>>>> +          contains:
>>>>>> +            const: pci17cb,1103
>>>>>> +    then:
>>>>>> +      required:
>>>>>> +        - vddrfacmn-supply
>>>>>> +        - vddaon-supply
>>>>>> +        - vddwlcx-supply
>>>>>> +        - vddwlmx-supply
>>>>>> +        - vddrfa0p8-supply
>>>>>> +        - vddrfa1p2-supply
>>>>>> +        - vddrfa1p8-supply
>>>>>> +        - vddpcie0p9-supply
>>>>>> +        - vddpcie1p8-supply
>>>>>
>>>>> Like we discussed before, shouldn't these supplies be optional as not
>>>>> all modules need them?
>>>>>
>>>>
>>>> The answer is still the same: the ATH11K inside a WCN6855 does - in
>>>> fact - always need them. The fact that the X13s doesn't define them is
>>>> bad representation of HW and I'm fixing it in a subsequent DTS patch.
>>>
>>> But, like we discussed earlier, M.2 boards don't need these so I think
>>> this should be optional.
>>>
>>
>> If they are truly dynamic, plug-and-play M.2 boards then they
>> shouldn't need any description in device-tree. If they are M.2 sockets
>> that use custom, vendor-specific pins (like what is the case on
>> sc8280xp-crd and X13s) then the HW they carry needs to be described
>> correctly. We've discussed that before.
> 
> Sigh. Please reread the previous discussion. In some cases we need to
> set qcom,ath11k-calibration-variant even for M.2 boards.

M.2 cards also have the same power sequencing troubles because of usage
of reserved or custom pins. Whether the properties here are required or
optional, depends not on the board but on the M.2 card. Therefore I
don't understand why you claim it should be optional, just because it is
M.2.

Best regards,
Krzysztof