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BCM270X_DT: Add pi3-miniuart-bt DT overlay

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Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
usable baudrate.

It is also necessary to edit /lib/systemd/system/hciuart.server and
replace ttyAMA0 with ttyS0.

If cmdline.txt uses the alias serial0 to refer to the user-accessable port
then the firmware will replace with the appropriate port whether or not
this overlay is used.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
This commit is contained in:
Phil Elwell
2016-03-07 09:53:03 +00:00
committed by popcornmix
parent 1807dd78b1
commit 4adf0d9478
3 changed files with 72 additions and 0 deletions
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1
arch/arm/boot/dts/overlays/Makefile
View File

@@ -40,6 +40,7 @@ dtb-$(RPI_DT_OVERLAYS) += mcp2515-can1-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += mmc-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += mz61581-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += pi3-disable-bt-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += pi3-miniuart-bt-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += piscreen-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += piscreen2r-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += pitft28-capacitive-overlay.dtb

10
arch/arm/boot/dts/overlays/README
View File

@@ -504,6 +504,16 @@ Load: dtoverlay=pi3-disable-bt
Params: <None>
Name: pi3-miniuart-bt
Info: Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
usable baudrate.
N.B. It is also necessary to edit /lib/systemd/system/hciuart.server
and replace ttyAMA0 with ttyS0.
Load: dtoverlay=pi3-miniuart-bt
Params: <None>
Name: piscreen
Info: PiScreen display by OzzMaker.com
Load: dtoverlay=piscreen,<param>=<val>

61
arch/arm/boot/dts/overlays/pi3-miniuart-bt-overlay.dts Normal file
View File

@@ -0,0 +1,61 @@
/dts-v1/;
/plugin/;
/* Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
usable baudrate.
It is also necessary to edit /lib/systemd/system/hciuart.server and
replace ttyAMA0 with ttyS0.
If cmdline.txt uses the alias serial0 to refer to the user-accessable port
then the firmware will replace with the appropriate port whether or not
this overlay is used.
*/
/{
compatible = "brcm,bcm2708";
fragment@0 {
target = <&uart0>;
__overlay__ {
pinctrl-names = "default";
pinctrl-0 = <&uart0_pins>;
status = "okay";
};
};
fragment@1 {
target = <&uart1>;
__overlay__ {
pinctrl-names = "default";
pinctrl-0 = <&uart1_pins>;
status = "okay";
};
};
fragment@2 {
target = <&gpio>;
__overlay__ {
uart0_pins: uart0_pins {
brcm,pins = <14 15>;
brcm,function = <4>; /* alt0 */
brcm,pull = <0 2>;
};
uart1_pins: uart1_pins {
brcm,pins = <32 33>;
brcm,function = <2>; /* alt5=UART1 */
brcm,pull = <0 0>;
};
};
};
fragment@3 {
target-path = "/aliases";
__overlay__ {
serial0 = "/soc/uart@7e201000";
serial1 = "/soc/uart@7e215040";
};
};
};