netdev - Re: [PATCH 1/4] dt-bindings: net: broadcom-bluetooth: Add CYW55572 DT binding

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Date:   Wed, 29 Jun 2022 12:29:31 +0200
From:   Hakan Jansson <hakan.jansson@...ineon.com>
To:     Rob Herring <robh@...nel.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        "Luiz Augusto von Dentz" <luiz.dentz@...il.com>,
        <linux-bluetooth@...r.kernel.org>
Subject: Re: [PATCH 1/4] dt-bindings: net: broadcom-bluetooth: Add CYW55572 DT
 binding

On 6/29/2022 12:41 AM, Rob Herring wrote:
> On Tue, Jun 28, 2022 at 04:03:57PM +0200, Hakan Jansson wrote:
>> Hi Rob,
>>
>> On 6/27/2022 7:34 PM, Rob Herring wrote:
>>> On Mon, Jun 20, 2022 at 04:06:25PM +0200, Hakan Jansson wrote:
>>>> Hi Krzysztof,
>>>>
>>>> Thanks for replying.
>>>>
>>>> On 6/20/2022 2:32 PM, Krzysztof Kozlowski wrote:
>>>>>> CYW55572 is a Wi-Fi + Bluetooth combo device from Infineon.
>>>>>> Extend the binding with its DT compatible.
>>>>>>
>>>>>> Signed-off-by: Hakan Jansson <hakan.jansson@...ineon.com>
>>>>>> ---
>>>>>>     Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml | 1 +
>>>>>>     1 file changed, 1 insertion(+)
>>>>>>
>>>>>> diff --git a/Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml b/Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml
>>>>>> index df59575840fe..71fe9b17f8f1 100644
>>>>>> --- a/Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml
>>>>>> +++ b/Documentation/devicetree/bindings/net/broadcom-bluetooth.yaml
>>>>>> @@ -24,6 +24,7 @@ properties:
>>>>>>           - brcm,bcm43540-bt
>>>>>>           - brcm,bcm4335a0
>>>>>>           - brcm,bcm4349-bt
>>>>>> +      - infineon,cyw55572-bt
>>>>> Patch is okay, but just to be sure - is it entirely different device
>>>>> from Infineon or some variant of Broadcom block?
>>>> CYW55572 is a new device from Infineon. It is not the same as any Broadcom
>>>> device.
>>>>
>>>>>     Are all existing
>>>>> properties applicable to it as well?
>>>> Yes, all existing properties are applicable.
>>> Including 'brcm,bt-pcm-int-params'?
>> Yes, 'brcm,bt-pcm-int-params' is also applicable to CYW55572.
>>
>>> I don't see a BT reset signal
>>> either, but maybe that's not pinned out in the AzureWave module which
>>> was the only documentation details I could find[1].
>> That's correct, CYW55572 does not have a BT reset signal. Most of the
>> existing listed compatible devices does not seem to have a BT reset signal
>> either so I think this is in line with the intention of the existing
>> document and driver implementation.
>>
>>> I think a separate doc will be better as it can be more precise as to
>>> what's allowed or not. It's fine to reuse the same property names
>>> though.
>> I don't really see anything besides the optional BT reset property that
>> would be changed in a separate doc.  As a separate doc would mean a
>> duplication of data that would need to be maintained in two more or less
>> identical docs, perhaps it would be better to modify the existing doc to
>> clarify for which compatible devices that the BT reset property applies?
>> (Which I believe are only these three: bcm20702a1, bcm4329-bt and
>> bcm4330-bt)
> Okay, I guess this is fine in the same doc. Any conditionals to tighten
> up the constraints would be welcome.
>
> Rob

Ok, I'll add a patch with conditionals and resubmit a new rev of the 
patch series.

/Håkan