linux-kernel - Re: [PATCH v2 1/4] dt-bindings: bluetooth: add 'qcom,product-variant'

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Message-ID: <8a185104-f393-4341-ac85-34cb83c47c22@quicinc.com>
Date: Thu, 21 Nov 2024 23:53:19 +0800
From: "Cheng Jiang (IOE)" <quic_chejiang@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Marcel Holtmann
	<marcel@...tmann.org>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "Rob
 Herring" <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Conor
 Dooley" <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        "Konrad Dybcio" <konradybcio@...nel.org>,
        Balakrishna Godavarthi
	<quic_bgodavar@...cinc.com>,
        Rocky Liao <quic_rjliao@...cinc.com>, <quic_zijuhu@...cinc.com>
CC: <linux-bluetooth@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <quic_mohamull@...cinc.com>
Subject: Re: [PATCH v2 1/4] dt-bindings: bluetooth: add 'qcom,product-variant'

Hi Krzysztof,

On 11/21/2024 3:49 PM, Krzysztof Kozlowski wrote:
> On 21/11/2024 05:06, Cheng Jiang wrote:
>> Hi Krzysztof,
>>
>> On 11/21/2024 12:47 AM, Krzysztof Kozlowski wrote:
>>> On 20/11/2024 10:54, Cheng Jiang wrote:
>>>> Several Qualcomm projects will use the same Bluetooth chip, each
>>>> focusing on different features. For instance, consumer projects
>>>> prioritize the A2DP SRC feature, while IoT projects focus on the A2DP
>>>> SINK feature, which may have more optimizations for coexistence when
>>>> acting as a SINK. Due to the patch size, it is not feasible to include
>>>> all features in a single firmware.
>>>>
>>>> Therefore, the 'product-variant' devicetree property is used to provide
>>>> product information for the Bluetooth driver to load the appropriate
>>>> firmware.
>>>>
>>>> If this property is not defined, the default firmware will be loaded,
>>>> ensuring there are no backward compatibility issues with older
>>>> devicetrees.
>>>>
>>>> The product-variant defines like this:
>>>>   0 - 15 (16 bits) are product line specific definitions
>>>>   16 - 23 (8 bits) are for the product line.
>>>>   24 - 31 (8 bits) are reserved for future use, 0 currently
>>>>
>>>> |---------------------------------------------------------------------|
>>>> |                       32 Bits                                       |
>>>> |---------------------------------------------------------------------|
>>>> |  31 - 24 (bits)   |    23 - 16 (bits)   | 15 - 0 (16 bits)          |
>>>> |---------------------------------------------------------------------|
>>>> |   Reserved        |    0: default       | 0: default                |
>>>> |                   |    1: CE            |                           |
>>>> |                   |    2: IoT           |                           |
>>>> |                   |    3: Auto          |                           |
>>>> |                   |    4: Reserved      |                           |
>>>> |---------------------------------------------------------------------|
>>>>
>>>> Signed-off-by: Cheng Jiang <quic_chejiang@...cinc.com>
>>>> ---
>>>>  .../bindings/net/bluetooth/qualcomm-bluetooth.yaml          | 6 ++++++
>>>>  1 file changed, 6 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml b/Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml
>>>> index 7bb68311c609..9019fe7bcdc6 100644
>>>> --- a/Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml
>>>> +++ b/Documentation/devicetree/bindings/net/bluetooth/qualcomm-bluetooth.yaml
>>>> @@ -110,6 +110,12 @@ properties:
>>>>      description:
>>>>        boot firmware is incorrectly passing the address in big-endian order
>>>>  
>>>> +  qcom,product-variant:
>>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>>> +    description:
>>>> +      specify the product information for driver to load the appropriate firmware
>>>
>>> Nah, you have firmware-name for this.
>>>
>> Currently "firmware-name" is used to specifythe nvm (config) file only,
>> we also need to specify the rampatch file (TLV). 
>>  
>> Can we re-use the "firmware-name"? add two segments like the following?
>> firmware-name = "rampatch_xx.tlv",  "nvm_xx.bin";
>>
>> Or add a new property to specify the rampatch file? 
>> rampatch-name = "rampatch_xx.tlv";
> You can grow the property, it's a list. Order of items in the list must
> be fixed (specific), though. See other Qualcomm remoteproc PAS loaders
> which already use two entries.
Thank you for the guidance. I will follow it to submit a new change. 
> 
> Best regards,
> Krzysztof