target/linux/brcm2708/patches-4.14/950-0159-overlays-Add-uart0-overlay-to-change-pin-usage.patch

   1 From f0f4af3ddb0fc5ea529c0147ebf8be47b1a80335 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 12 Jan 2018 09:15:01 +0000
   4 Subject: [PATCH 159/454] overlays: Add uart0 overlay to change pin usage
   5
   6 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
   7 ---
   8  arch/arm/boot/dts/overlays/Makefile          |  1 +
   9  arch/arm/boot/dts/overlays/README            | 13 +++++++-
  10  arch/arm/boot/dts/overlays/uart0-overlay.dts | 32 ++++++++++++++++++++
  11  3 files changed, 45 insertions(+), 1 deletion(-)
  12  create mode 100755 arch/arm/boot/dts/overlays/uart0-overlay.dts
  13
  14 --- a/arch/arm/boot/dts/overlays/Makefile
  15 +++ b/arch/arm/boot/dts/overlays/Makefile
  16 @@ -117,6 +117,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  17         spi2-2cs.dtbo \
  18         spi2-3cs.dtbo \
  19         tinylcd35.dtbo \
  20 +       uart0.dtbo \
  21         uart1.dtbo \
  22         vc4-fkms-v3d.dtbo \
  23         vc4-kms-v3d.dtbo \
  24 --- a/arch/arm/boot/dts/overlays/README
  25 +++ b/arch/arm/boot/dts/overlays/README
  26 @@ -1671,8 +1671,19 @@ Params: speed                   Display
  27                  dtoverlay=tinylcd35,touch,touchgpio=3
  28
  29
  30 +Name:   uart0
  31 +Info:   Change the pin usage of uart0
  32 +Load:   dtoverlay=uart0,<param>=<val>
  33 +Params: txd0_pin                GPIO pin for TXD0 (14, 32 or 36 - default 14)
  34 +
  35 +        rxd0_pin                GPIO pin for RXD0 (15, 33 or 37 - default 15)
  36 +
  37 +        pin_func                Alternative pin function - 4(Alt0) for 14&15,
  38 +                                7(Alt3) for 32&33, 6(Alt2) for 36&37
  39 +
  40 +
  41  Name:   uart1
  42 -Info:   Enable uart1 in place of uart0
  43 +Info:   Change the pin usage of uart1
  44  Load:   dtoverlay=uart1,<param>=<val>
  45  Params: txd1_pin                GPIO pin for TXD1 (14, 32 or 40 - default 14)
  46
  47 --- /dev/null
  48 +++ b/arch/arm/boot/dts/overlays/uart0-overlay.dts
  49 @@ -0,0 +1,32 @@
  50 +/dts-v1/;
  51 +/plugin/;
  52 +
  53 +/{
  54 +       compatible = "brcm,bcm2708";
  55 +
  56 +       fragment@0 {
  57 +               target = <&uart0>;
  58 +               __overlay__ {
  59 +                       pinctrl-names = "default";
  60 +                       pinctrl-0 = <&uart0_pins>;
  61 +                       status = "okay";
  62 +               };
  63 +       };
  64 +
  65 +       fragment@1 {
  66 +               target = <&gpio>;
  67 +               __overlay__ {
  68 +                       uart0_pins: uart0_pins {
  69 +                               brcm,pins = <14 15>;
  70 +                               brcm,function = <4>; /* alt0 */
  71 +                               brcm,pull = <0 2>;
  72 +                       };
  73 +               };
  74 +       };
  75 +
  76 +       __overrides__ {
  77 +               txd0_pin = <&uart0_pins>,"brcm,pins:0";
  78 +               rxd0_pin = <&uart0_pins>,"brcm,pins:4";
  79 +               pin_func = <&uart0_pins>,"brcm,function:0";
  80 +       };
  81 +};