target/linux/brcm2708/patches-4.4/0172-BCM270X_DT-Add-pi3-miniuart-bt-DT-overlay.patch

   1 From 3b93a5e60a2272bea6b50561c6e871dde5295dfb Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 7 Mar 2016 09:53:03 +0000
   4 Subject: [PATCH 172/180] BCM270X_DT: Add pi3-miniuart-bt DT overlay
   5
   6 Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
   7 UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
   8 usable baudrate.
   9
  10 It is also necessary to edit /lib/systemd/system/hciuart.server and
  11 replace ttyAMA0 with ttyS0.
  12
  13 If cmdline.txt uses the alias serial0 to refer to the user-accessable port
  14 then the firmware will replace with the appropriate port whether or not
  15 this overlay is used.
  16
  17 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  18 ---
  19  arch/arm/boot/dts/overlays/Makefile                |  1 +
  20  arch/arm/boot/dts/overlays/README                  | 10 ++++
  21  .../boot/dts/overlays/pi3-miniuart-bt-overlay.dts  | 61 ++++++++++++++++++++++
  22  3 files changed, 72 insertions(+)
  23  create mode 100644 arch/arm/boot/dts/overlays/pi3-miniuart-bt-overlay.dts
  24
  25 --- a/arch/arm/boot/dts/overlays/Makefile
  26 +++ b/arch/arm/boot/dts/overlays/Makefile
  27 @@ -40,6 +40,7 @@ dtb-$(RPI_DT_OVERLAYS) += mcp2515-can1-o
  28  dtb-$(RPI_DT_OVERLAYS) += mmc-overlay.dtb
  29  dtb-$(RPI_DT_OVERLAYS) += mz61581-overlay.dtb
  30  dtb-$(RPI_DT_OVERLAYS) += pi3-disable-bt-overlay.dtb
  31 +dtb-$(RPI_DT_OVERLAYS) += pi3-miniuart-bt-overlay.dtb
  32  dtb-$(RPI_DT_OVERLAYS) += piscreen-overlay.dtb
  33  dtb-$(RPI_DT_OVERLAYS) += piscreen2r-overlay.dtb
  34  dtb-$(RPI_DT_OVERLAYS) += pitft28-capacitive-overlay.dtb
  35 --- a/arch/arm/boot/dts/overlays/README
  36 +++ b/arch/arm/boot/dts/overlays/README
  37 @@ -504,6 +504,16 @@ Load:   dtoverlay=pi3-disable-bt
  38  Params: <None>
  39
  40
  41 +Name:   pi3-miniuart-bt
  42 +Info:   Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
  43 +        UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
  44 +        usable baudrate.
  45 +        N.B. It is also necessary to edit /lib/systemd/system/hciuart.server
  46 +        and replace ttyAMA0 with ttyS0.
  47 +Load:   dtoverlay=pi3-miniuart-bt
  48 +Params: <None>
  49 +
  50 +
  51  Name:   piscreen
  52  Info:   PiScreen display by OzzMaker.com
  53  Load:   dtoverlay=piscreen,<param>=<val>
  54 --- /dev/null
  55 +++ b/arch/arm/boot/dts/overlays/pi3-miniuart-bt-overlay.dts
  56 @@ -0,0 +1,61 @@
  57 +/dts-v1/;
  58 +/plugin/;
  59 +
  60 +/* Switch Pi3 Bluetooth function to use the mini-UART (ttyS0) and restore
  61 +   UART0/ttyAMA0 over GPIOs 14 & 15. Note that this may reduce the maximum
  62 +   usable baudrate.
  63 +
  64 +   It is also necessary to edit /lib/systemd/system/hciuart.server and
  65 +   replace ttyAMA0 with ttyS0.
  66 +
  67 +   If cmdline.txt uses the alias serial0 to refer to the user-accessable port
  68 +   then the firmware will replace with the appropriate port whether or not
  69 +   this overlay is used.
  70 +*/
  71 +
  72 +/{
  73 +       compatible = "brcm,bcm2708";
  74 +
  75 +       fragment@0 {
  76 +               target = <&uart0>;
  77 +               __overlay__ {
  78 +                       pinctrl-names = "default";
  79 +                       pinctrl-0 = <&uart0_pins>;
  80 +                       status = "okay";
  81 +               };
  82 +       };
  83 +
  84 +       fragment@1 {
  85 +               target = <&uart1>;
  86 +               __overlay__ {
  87 +                       pinctrl-names = "default";
  88 +                       pinctrl-0 = <&uart1_pins>;
  89 +                       status = "okay";
  90 +               };
  91 +       };
  92 +
  93 +       fragment@2 {
  94 +               target = <&gpio>;
  95 +               __overlay__ {
  96 +                       uart0_pins: uart0_pins {
  97 +                               brcm,pins = <14 15>;
  98 +                               brcm,function = <4>; /* alt0 */
  99 +                               brcm,pull = <0 2>;
 100 +                       };
 101 +
 102 +                       uart1_pins: uart1_pins {
 103 +                               brcm,pins = <32 33>;
 104 +                               brcm,function = <2>; /* alt5=UART1 */
 105 +                               brcm,pull = <0 0>;
 106 +                       };
 107 +               };
 108 +       };
 109 +
 110 +       fragment@3 {
 111 +               target-path = "/aliases";
 112 +               __overlay__ {
 113 +                       serial0 = "/soc/uart@7e201000";
 114 +                       serial1 = "/soc/uart@7e215040";
 115 +               };
 116 +       };
 117 +};