target/linux/brcm2708/patches-4.4/0500-overlays-Add-dpi18-overlay-1634.patch

   1 From 654ea8a724a4abaf000841788cec8f90756682a7 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <pelwell@users.noreply.github.com>
   3 Date: Mon, 12 Sep 2016 13:46:56 +0100
   4 Subject: [PATCH] overlays: Add dpi18 overlay (#1634)
   5
   6 Add support for 18-bit DPI displays. Although the dpi24 overlay could
   7 be used, this overlay leaves GPIOs 22-27 free for other uses.
   8 ---
   9  arch/arm/boot/dts/overlays/Makefile          |  1 +
  10  arch/arm/boot/dts/overlays/README            |  8 +++++++
  11  arch/arm/boot/dts/overlays/dpi18-overlay.dts | 31 ++++++++++++++++++++++++++++
  12  3 files changed, 40 insertions(+)
  13  create mode 100644 arch/arm/boot/dts/overlays/dpi18-overlay.dts
  14
  15 --- a/arch/arm/boot/dts/overlays/Makefile
  16 +++ b/arch/arm/boot/dts/overlays/Makefile
  17 @@ -22,6 +22,7 @@ dtbo-$(RPI_DT_OVERLAYS) += audremap.dtbo
  18  dtbo-$(RPI_DT_OVERLAYS) += bmp085_i2c-sensor.dtbo
  19  dtbo-$(RPI_DT_OVERLAYS) += dht11.dtbo
  20  dtbo-$(RPI_DT_OVERLAYS) += dionaudio-loco.dtbo
  21 +dtbo-$(RPI_DT_OVERLAYS) += dpi18.dtbo
  22  dtbo-$(RPI_DT_OVERLAYS) += dpi24.dtbo
  23  dtbo-$(RPI_DT_OVERLAYS) += dwc-otg.dtbo
  24  dtbo-$(RPI_DT_OVERLAYS) += dwc2.dtbo
  25 --- a/arch/arm/boot/dts/overlays/README
  26 +++ b/arch/arm/boot/dts/overlays/README
  27 @@ -283,6 +283,14 @@ Load:   dtoverlay=dionaudio-loco
  28  Params: <None>
  29
  30
  31 +Name:   dpi18
  32 +Info:   Overlay for a generic 18-bit DPI display
  33 +        This uses GPIOs 0-21 (so no I2C, uart etc.), and activates the output
  34 +        2-3 seconds after the kernel has started.
  35 +Load:   dtoverlay=dpi18
  36 +Params: <None>
  37 +
  38 +
  39  Name:   dpi24
  40  Info:   Overlay for a generic 24-bit DPI display
  41          This uses GPIOs 0-27 (so no I2C, uart etc.), and activates the output
  42 --- /dev/null
  43 +++ b/arch/arm/boot/dts/overlays/dpi18-overlay.dts
  44 @@ -0,0 +1,31 @@
  45 +/dts-v1/;
  46 +/plugin/;
  47 +
  48 +/{
  49 +       compatible = "brcm,bcm2708";
  50 +
  51 +       // There is no DPI driver module, but we need a platform device
  52 +       // node (that doesn't already use pinctrl) to hang the pinctrl
  53 +       // reference on - leds will do
  54 +
  55 +       fragment@0 {
  56 +               target = <&leds>;
  57 +               __overlay__ {
  58 +                       pinctrl-names = "default";
  59 +                       pinctrl-0 = <&dpi18_pins>;
  60 +               };
  61 +       };
  62 +
  63 +       fragment@1 {
  64 +               target = <&gpio>;
  65 +               __overlay__ {
  66 +                       dpi18_pins: dpi18_pins {
  67 +                               brcm,pins = <0 1 2 3 4 5 6 7 8 9 10 11
  68 +                                            12 13 14 15 16 17 18 19 20
  69 +                                            21>;
  70 +                               brcm,function = <6>; /* alt2 */
  71 +                               brcm,pull = <0>; /* no pull */
  72 +                       };
  73 +               };
  74 +       };
  75 +};