netdev - Re: [PATCH v3 2/2] dt-bindings: net: bluetooth: Add device property firmware-name for QCA6174

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Date:   Sun, 5 May 2019 19:32:58 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Rocky Liao <rjliao@...eaurora.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Thierry Escande <thierry.escande@...aro.org>,
        netdev <netdev@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel@...r.kernel.org,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Balakrishna Godavarthi <bgodavar@...eaurora.org>,
        linux-bluetooth-owner@...r.kernel.org
Subject: Re: [PATCH v3 2/2] dt-bindings: net: bluetooth: Add device property
 firmware-name for QCA6174

Hi Rocky,

>>>>>> This patch adds an optional device property "firmware-name" to allow
>>>>>> the
>>>>>> driver to load customized nvm firmware file based on this property.
>>>>>> Signed-off-by: Rocky Liao <rjliao@...eaurora.org>
>>>>>> ---
>>>>>> Changes in v3:
>>>>>> * added firmware-name instead of nvm-postfix to specify full firmware
>>>>>> name
>>>>>> ---
>>>>>> Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt | 2 ++
>>>>>> 1 file changed, 2 insertions(+)
>>>>>> diff --git
>>>>>> a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
>>>>>> b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
>>>>>> index 824c0e2..2bcea50 100644
>>>>>> --- a/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
>>>>>> +++ b/Documentation/devicetree/bindings/net/qualcomm-bluetooth.txt
>>>>>> @@ -16,6 +16,7 @@ Optional properties for compatible string
>>>>>> qcom,qca6174-bt:
>>>>>> - enable-gpios: gpio specifier used to enable chip
>>>>>> - clocks: clock provided to the controller (SUSCLK_32KHZ)
>>>>>> + - firmware-name: specify the name of nvm firmware to load
>>>>>> Required properties for compatible string qcom,wcn3990-bt:
>>>>>> @@ -39,6 +40,7 @@ serial@...0000 {
>>>>>>            enable-gpios = <&pm8994_gpios 19 GPIO_ACTIVE_HIGH>;
>>>>>>            clocks = <&divclk4>;
>>>>>> +            firmware-name = "nvm_00440302.bin";
>>>>>>    };
>>>>> and how is this a firmware-name property. Wouldn’t this be more like
>>>>> nvm-file or something along these lines. This really needs to be
>>>>> cleared with Rob to pick the right property name.
>>>>> Regards
>>>>> Marcel
>>>> Hi Rob,
>>>> Are you OK to use a property name "nvm-file" or "firmware-nvm-file"?
>>>> Actually we have two firmware files, one is the patch file which is
>>>> common to all of the products, the other is the nvm file which is
>>>> customized. Using a "nvm-file" or "firmware-nvm-file" property name
>>>> would be more clear.
>>> 'firmware-name' is the standard name for specifying firmware file names.
>> but it is not a firmware file, it is a NVM file. What happens if in
>> the future they need a firmware file and a NVM file?
>> Regards
>> Marcel
> 
> We won't need to specify a rampatch firmware file in future as it's a same file for all the boards with same chip, only the NVM firmware file may have board differences. NVM file is also one of the firmware files so I think it should be OK to use "firmware-name" property to specify it.

ok then, but I need patches that apply cleanly against bluetooth-next.

Regards

Marcel