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From 3a7f5db20ed4d685ce8b5336f859d547bdd98a85 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.org>
Date: Mon, 7 Mar 2016 09:53:03 +0000
Subject: [PATCH] BCM270X_DT: Add pi3-miniuart-bt DT overlay
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>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 10 ++++
.../boot/dts/overlays/pi3-miniuart-bt-overlay.dts | 61 ++++++++++++++++++++++
3 files changed, 72 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/pi3-miniuart-bt-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -40,6 +40,7 @@ dtb-$(RPI_DT_OVERLAYS) += mcp2515-can1-o
dtb-$(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
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -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>
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/pi3-miniuart-bt-overlay.dts
@@ -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";
+ };
+ };
+};
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