Re: [PATCH v3 3/3] arm: dts: rk3288-tinker.dtsi: Add outline Bluetooth support

From: "Heiko Stübner" <heiko@sntech.de>
To: David Summers <beagleboard@davidjohnsummers.uk>
Cc: devicetree@vger.kernel.org, johan.hedberg@gmail.com,
	linux-bluetooth@vger.kernel.org, marcel@holtmann.org,
	linux-rockchip@lists.infradead.org, robh+dt@kernel.org,
	frowand.list@gmail.com, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 3/3] arm: dts: rk3288-tinker.dtsi: Add outline Bluetooth support
Date: Wed, 13 Mar 2019 11:56:58 +0100	[thread overview]
Message-ID: <4537885.W6WcYDDAQ4@diego> (raw)
In-Reply-To: <20190309153923.22806-3-beagleboard@davidjohnsummers.uk>

Hi David,

Am Samstag, 9. März 2019, 16:39:23 CET schrieb David Summers:
> This patch is an outline for bluetooth on the ASUS Tinker Board (S).
> 
> Bluetooth is provided my RTL8723BS on these machine, and this is wired
> into UART0.
> 
> Here this is performed as a SerDev device.
> 
> Now as presented, this does not give functioning bluetooth. The
> updates needed to the device driver:
> 
> https://www.spinics.net/lists/linux-bluetooth/msg78661.html
> 
> Haven't yet been accepted. So this device tree hook doesn't yet have
> "realtek,rtl8723bs-bt" compatible flag.
> 
> It is however still submitted as a patch, as it sets the UART up
> correctly. And so basic communciation can be had with the device. This
> has been confirmed by Tony McKahan @ Armbian, in particular that the
> CTS/RTS is needed.
> 
> When Vasily patch is accepted, this will be added as a minor patch on
> top of this patch; as this patch gives the pins needed.
> 
> The one oddity, is the RESET pin, it is labeled this way on the
> schematic. However the hci_h5.c driver calls this ENABLE. Here we have
> stuck with the schematic name.
> 
> Signed-off-by: David Summers <beagleboard@davidjohnsummers.uk>
> ---
>  arch/arm/boot/dts/rk3288-tinker.dtsi | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/rk3288-tinker.dtsi
> b/arch/arm/boot/dts/rk3288-tinker.dtsi index 0ffab1b7c940..d29f5b34d7e6
> 100644
> --- a/arch/arm/boot/dts/rk3288-tinker.dtsi
> +++ b/arch/arm/boot/dts/rk3288-tinker.dtsi
> @@ -486,6 +486,17 @@
> 
>  &uart0 {
>  	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&uart0_xfer>, <&uart0_cts>, <&uart0_rts>;
> +
> +	bluetooth {
> +		clocks = <&rk808 RK808_CLKOUT1>;
> +		reset-gpios = <&gpio4 RK_PD5 GPIO_ACTIVE_HIGH>;
> +		device-wake-gpios = <&gpio4 RK_PD2 GPIO_ACTIVE_HIGH>;
> +		host-wake-gpios = <&gpio4 RK_PD7 GPIO_ACTIVE_HIGH>;
> +		vcc-18-supply = <&vcc_18>;
> +		vcc-io-supply = <&vcc_io>;
> +	};

As this is supposed to work as serial attached device it should follow a
dt-binding, so first of all definitly needs a compatible and a binding
specifying all the properties declared above.

See for example Documentation/devicetree/bindings/net/broadcom-bluetooth.txt
for a similar device.

Heiko

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