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

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Date:   Fri, 22 Feb 2019 11:21:00 -0800
From:   Vasily Khoruzhick <anarsoul@...il.com>
To:     David Summers <beagleboard@...idjohnsummers.uk>
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 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.

> 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
>
>