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

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Message-ID: <CAL_JsqLROpJMoEPLXaAL_JG1SNufstMDmB4xy_V_p4=duHKPSA@mail.gmail.com>
Date:   Tue, 19 Feb 2019 08:17:19 -0600
From:   Rob Herring <robh@...nel.org>
To:     Vasily Khoruzhick <anarsoul@...il.com>
Cc:     Stefan Wahren <stefan.wahren@...e.com>,
        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>,
        David Summers <beagleboard@...idjohnsummers.uk>
Subject: Re: [PATCH 3/8] dt-bindings: net: bluetooth: Add rtl8723bs-bluetooth

On Mon, Feb 18, 2019 at 4:28 PM Vasily Khoruzhick <anarsoul@...il.com> 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.

Then why do we have both? Reset and enable are distinct. The inverse
of enable-gpios is typically powerdown-gpios, not reset-gpios.

Rob