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From e203577bc5e6aab0b42e2d7cc25999b2e0976e0b Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Wed, 2 Mar 2016 10:59:05 +0000
Subject: [PATCH] BCM270X_DT: Add pi3-disable-bt overlay
Disable Bluetooth and restore UART0/ttyAMA0 over GPIOs 14 & 15. To disable
the systemd service that initialises the modem so it doesn't use the UART:
sudo systemctl disable hciuart
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 8 ++++
.../boot/dts/overlays/pi3-disable-bt-overlay.dts | 48 ++++++++++++++++++++++
3 files changed, 57 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/pi3-disable-bt-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -39,6 +39,7 @@ dtb-$(RPI_DT_OVERLAYS) += mcp2515-can0-o
dtb-$(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) += piscreen-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += piscreen2r-overlay.dtb
dtb-$(RPI_DT_OVERLAYS) += pitft28-capacitive-overlay.dtb
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -496,6 +496,14 @@ Params: speed Display
[ The pcf8563-rtc overlay has been deleted. See i2c-rtc. ]
+Name: pi3-disable-bt
+Info: Disable Pi3 Bluetooth and restore UART0/ttyAMA0 over GPIOs 14 & 15
+ N.B. To disable the systemd service that initialises the modem so it
+ doesn't use the UART, use 'sudo systemctl disable hciuart'.
+Load: dtoverlay=pi3-disable-bt
+Params: <None>
+
+
Name: piscreen
Info: PiScreen display by OzzMaker.com
Load: dtoverlay=piscreen,<param>=<val>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/pi3-disable-bt-overlay.dts
@@ -0,0 +1,48 @@
+/dts-v1/;
+/plugin/;
+
+/* Disable Bluetooth and restore UART0/ttyAMA0 over GPIOs 14 & 15.
+ To disable the systemd service that initialises the modem so it doesn't use
+ the UART:
+
+ sudo systemctl disable hciuart
+*/
+
+/{
+ compatible = "brcm,bcm2708";
+
+ fragment@0 {
+ target = <&uart1>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ fragment@1 {
+ target = <&uart0>;
+ __overlay__ {
+ pinctrl-names = "default";
+ pinctrl-0 = <&uart0_pins>;
+ status = "okay";
+ };
+ };
+
+ fragment@2 {
+ target = <&gpio>;
+ __overlay__ {
+ uart0_pins: uart0_pins {
+ brcm,pins = <14 15>;
+ brcm,function = <4>; /* alt0 */
+ brcm,pull = <0 2>;
+ };
+ };
+ };
+
+ fragment@3 {
+ target-path = "/aliases";
+ __overlay__ {
+ serial0 = "/soc/uart@7e201000";
+ serial1 = "/soc/uart@7e215040";
+ };
+ };
+};
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