netdev - Re: [PATCH 3/8] dt-bindings: net: bluetooth: Add rtl8723bs-bluetooth

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Date:   Sat, 23 Feb 2019 20:16:17 +0000
From:   David Summers <beagleboard@...idjohnsummers.uk>
To:     Vasily Khoruzhick <anarsoul@...il.com>
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        Rob Herring <robh@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        netdev <netdev@...r.kernel.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        "David S. Miller" <davem@...emloft.net>,
        arm-linux <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/8] dt-bindings: net: bluetooth: Add rtl8723bs-bluetooth

On 22/02/2019 19:21, Vasily Khoruzhick wrote:
> On Fri, Feb 22, 2019 at 11:14 AM David Summers
> <beagleboard@...idjohnsummers.uk> wrote:
>> Hi Vasily,
>>
>> Just catching up with this series - good that you are doing it. We need
>> it for users on ArchLinux ARM!
>>
>> On question though, what is "firmware-postfix" used for? I see in the
>> documentation, that it points to the board name. But can't see where
>> else it is used.
> See h5_serdev_probe() in drivers/bluetooth/hci_h5.c. Basically it
> specifies what firmware config to use.
> I agree with Rob that we should probably use firmware-name here instead.

Ah OK followed it. its sets h5->id than in h5_btrtl_setup (in hci_h5) 
calls up btrtl_initialise (in btrtl.c) and that gives the file to load.

Guess now need to trace what firmware files are available.

Oh yes - see why you called it postfix, as that is the name given in 
btrl_initialise. I can't comment on what name is best, but I can see the 
sense of keeping the device tree hook the same as used as in 
btrtl_initialise.

>> Is there a need to have the board name?
> As far as I understand firmware config depends on board, so I think
> it's a good idea to use board name here.
>
>> Anyway good work.
> Thanks!
>
>> David.
>>
>> On 18/02/2019 22:28, Vasily Khoruzhick wrote:
>>> On Mon, Feb 18, 2019 at 2:08 PM Stefan Wahren <stefan.wahren@...e.com> wrote:
>>>> Hi Vasily,
>>> Hi Stefan,
>>>
>>>>> Vasily Khoruzhick <anarsoul@...il.com> hat am 18. Februar 2019 um 22:24 geschrieben:
>>>>>
>>>>>
>>>>> On Mon, Feb 18, 2019 at 1:10 PM Rob Herring <robh@...nel.org> wrote:
>>>>>> On Fri, Jan 18, 2019 at 09:02:27AM -0800, Vasily Khoruzhick wrote:
>>>>>>> Add binding document for bluetooth part of RTL8723BS/RTL8723CS
>>>>>>>
>>>>>>> Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
>>>>>>> ---
>>>>>>>    .../bindings/net/rtl8723bs-bluetooth.txt      | 35 +++++++++++++++++++
>>>>>>>    1 file changed, 35 insertions(+)
>>>>>>>    create mode 100644 Documentation/devicetree/bindings/net/rtl8723bs-bluetooth.txt
>>>>>>>
>>>>>>> diff --git a/Documentation/devicetree/bindings/net/rtl8723bs-bluetooth.txt b/Documentation/devicetree/bindings/net/rtl8723bs-bluetooth.txt
>>>>>>> new file mode 100644
>>>>>>> index 000000000000..8357f242ae4c
>>>>>>> --- /dev/null
>>>>>>> +++ b/Documentation/devicetree/bindings/net/rtl8723bs-bluetooth.txt
>>>>>>> @@ -0,0 +1,35 @@
>>>>>>> +RTL8723BS/RTL8723CS Bluetooth
>>>>>>> +---------------------
>>>>>>> +
>>>>>>> +RTL8723CS/RTL8723CS is WiFi + BT chip. WiFi part is connected over SDIO, while
>>>>>>> +BT is connected over serial. It speaks H5 protocol with few extra commands
>>>>>>> +to upload firmware and change module speed.
>>>>>>> +
>>>>>>> +Required properties:
>>>>>>> +
>>>>>>> + - compatible: should be one of the following:
>>>>>>> +   * "realtek,rtl8723bs-bt"
>>>>>>> +   * "realtek,rtl8723cs-bt"
>>>>>>> +Optional properties:
>>>>>>> +
>>>>>>> + - device-wake-gpios: GPIO specifier, used to wakeup the BT module (active high)
>>>>>>> + - enable-gpios: GPIO specifier, used to enable the BT module (active high)
>>>>>>> + - host-wake-gpios: GPIO specifier, used to wakeup the host processor (active high)
>>>>>>> + - firmware-postfix: firmware postfix to be used for firmware config
>>>> sorry, i didn't noticed your great series before. David and i working at the same stuff but for the Asus Tinker Board.
>>>>
>>>> I created a similiar yet untested patch version for hci_h5 [1]. Maybe it's useful.
>>> Looks good to me, but you may need to add firmware-postfix.
>>>
>>>> Just a comment about the binding. It's really necessary to add the reset-gpio? Can't we use the enable-gpio with inverse polarity for this?
>>> Yes, we can use enable-gpio instead of reset-gpio on pine64 and pinebook.
>>>
>>>> Stefan
>>