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

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Date:   Mon, 18 Feb 2019 13:24:02 -0800
From:   Vasily Khoruzhick <anarsoul@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        netdev@...r.kernel.org, devicetree <devicetree@...r.kernel.org>,
        arm-linux <linux-arm-kernel@...ts.infradead.org>,
        linux-bluetooth@...r.kernel.org
Subject: Re: [PATCH 3/8] dt-bindings: net: bluetooth: Add rtl8723bs-bluetooth

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
>
> How is this used?

rtl8723bs-bt needs 2 firmware binaries -- one is actual firmware,
another is firmware config which is specific to the board. If
firmware-postfix is specified, driver appends it to the name of config
and requests board-specific config while loading firmware. I.e. if
'pine64' is specified as firmware-postfix driver will load
rtl8723bs_config-pine64.bin.

> Rob
>