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

[Stefan Wahren]

Hi Marcel,

> Marcel Holtmann <marcel at holtmann.org> hat am 25. Februar 2018 um 21:17 geschrieben:
> 
> 
> 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?

Yes, unload and reload works fine. 

> Meaning we are getting back to the 115200 default baud rate on the UART?

I assume that, because reload works as expected. 

> Or is this actually the device-wakeup GPIO?

The line is called BT_ON, so i don't expect this to be the device-wakeup. I don't have any schematics for the bluetooth part.

Regards
Stefan

> 
> Regards
> 
> Marcel
>