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- From adc561fa52120b3dd7a7c5f485bd7ab29e46e881 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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