[PATCH 3/4] ARM: dts: bcm2835-rpi-zero-w: Add bcm43438 serial slave

[Marcel Holtmann]

Hi Stefan,

> Add BCM43438 (bluetooth) as a serdev slave device of uart0 (pl011/ttyAMA0).
> This allows to automatically insert the bcm43438 to the bluetooth
> subsystem instead of relying on patched userspace helpers (hciattach).
> 
> In order to keep a debug UART we need to switch to uart1.
> 
> Signed-off-by: Stefan Wahren <stefan.wahren at i2se.com>
> ---
> arch/arm/boot/dts/bcm2835-rpi-zero-w.dts | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm/boot/dts/bcm2835-rpi-zero-w.dts b/arch/arm/boot/dts/bcm2835-rpi-zero-w.dts
> index cf53436..b7f79f1 100644
> --- a/arch/arm/boot/dts/bcm2835-rpi-zero-w.dts
> +++ b/arch/arm/boot/dts/bcm2835-rpi-zero-w.dts
> @@ -131,6 +131,18 @@
> 
> &uart0 {
> 	pinctrl-names = "default";
> -	pinctrl-0 = <&uart0_gpio14>;
> +	pinctrl-0 = <&uart0_gpio32 &uart0_ctsrts_gpio30>;
> +	status = "okay";
> +
> +	bluetooth {
> +		compatible = "brcm,bcm43438-bt";
> +		max-speed = <2000000>;
> +		shutdown-gpios = <&gpio 45 GPIO_ACTIVE_HIGH>;
> +	};
> +};

is the shutdown GPIO working as expected with this hardware. So even module unload and reload works fine? Meaning we are getting back to the 115200 default baud rate on the UART? Or is this actually the device-wakeup GPIO?

Regards

Marcel