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From e75384cf32c8941478f24ce4e4cdd7baff047c75 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.org>
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Date: Mon, 7 Mar 2016 09:53:03 +0000
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Subject: [PATCH 164/381] BCM270X_DT: Add pi3-miniuart-bt DT overlay
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Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
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UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
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usable baudrate.
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It is also necessary to edit /lib/systemd/system/hciuart.server and
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replace ttyAMA0 with ttyS0.
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If cmdline.txt uses the alias serial0 to refer to the user-accessable port
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then the firmware will replace with the appropriate port whether or not
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this overlay is used.
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Signed-off-by: Phil Elwell <phil@raspberrypi.org>
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 10 ++++
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.../boot/dts/overlays/pi3-miniuart-bt-overlay.dts | 61 ++++++++++++++++++++++
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3 files changed, 72 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/pi3-miniuart-bt-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -40,6 +40,7 @@ dtb-$(RPI_DT_OVERLAYS) += mcp2515-can1-o
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dtb-$(RPI_DT_OVERLAYS) += mmc-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += mz61581-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += pi3-disable-bt-overlay.dtb
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+dtb-$(RPI_DT_OVERLAYS) += pi3-miniuart-bt-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += piscreen-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += piscreen2r-overlay.dtb
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dtb-$(RPI_DT_OVERLAYS) += pitft28-capacitive-overlay.dtb
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -504,6 +504,16 @@ Load: dtoverlay=pi3-disable-bt
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Params: <None>
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+Name: pi3-miniuart-bt
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+Info: Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
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+ UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
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+ usable baudrate.
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+ N.B. It is also necessary to edit /lib/systemd/system/hciuart.server
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+ and replace ttyAMA0 with ttyS0.
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+Load: dtoverlay=pi3-miniuart-bt
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+Params: <None>
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+
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+
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Name: piscreen
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Info: PiScreen display by OzzMaker.com
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Load: dtoverlay=piscreen,<param>=<val>
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/pi3-miniuart-bt-overlay.dts
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@@ -0,0 +1,61 @@
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+/dts-v1/;
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+/plugin/;
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+
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+/* Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
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+ UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
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+ usable baudrate.
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+
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+ It is also necessary to edit /lib/systemd/system/hciuart.server and
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+ replace ttyAMA0 with ttyS0.
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+
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+ If cmdline.txt uses the alias serial0 to refer to the user-accessable port
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+ then the firmware will replace with the appropriate port whether or not
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+ this overlay is used.
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+*/
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+
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+/{
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+ compatible = "brcm,bcm2708";
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+
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+ fragment@0 {
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+ target = <&uart0>;
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+ __overlay__ {
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&uart0_pins>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&uart1>;
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+ __overlay__ {
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&uart1_pins>;
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+ status = "okay";
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+ };
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+ };
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+
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+ fragment@2 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ uart0_pins: uart0_pins {
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+ brcm,pins = <14 15>;
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+ brcm,function = <4>; /* alt0 */
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+ brcm,pull = <0 2>;
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+ };
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+
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+ uart1_pins: uart1_pins {
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+ brcm,pins = <32 33>;
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+ brcm,function = <2>; /* alt5=UART1 */
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+ brcm,pull = <0 0>;
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+ };
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+ };
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+ };
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+
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+ fragment@3 {
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+ target-path = "/aliases";
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+ __overlay__ {
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+ serial0 = "/soc/uart@7e201000";
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+ serial1 = "/soc/uart@7e215040";
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+ };
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+ };
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+};
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