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

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Date:   Tue, 19 Feb 2019 08:14:01 -0600
From:   Rob Herring <robh@...nel.org>
To:     Vasily Khoruzhick <anarsoul@...il.com>
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 <netdev@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        arm-linux <linux-arm-kernel@...ts.infradead.org>,
        "open list:BLUETOOTH DRIVERS" <linux-bluetooth@...r.kernel.org>
Subject: Re: [PATCH 3/8] dt-bindings: net: bluetooth: Add rtl8723bs-bluetooth

On Mon, Feb 18, 2019 at 3:24 PM Vasily Khoruzhick <anarsoul@...il.com> wrote:
>
> 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.

We already have 'firmware-name' defined and I'd prefer not to have
another way to do things. The difference is just you have to give the
full filename.

Also, on other chips with board specific config blobs, there's been
some discussion of converting those to DT properties. That depends on
you knowing what's in the blob and having a reasonable number of
parameter to make properties.

Rob