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";
+		};
+	};
+};