target/linux/brcm2708/patches-4.19/950-0314-overlays-Add-ssd1306-overlay-for-OLED-display.patch

   1 From f6ed9ece5ed29ca16dc021ce0e9ab64bf4c879cb Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 21 Jan 2019 21:17:27 +0000
   4 Subject: [PATCH 314/703] overlays: Add ssd1306 overlay for OLED display
   5
   6 See: https://github.com/raspberrypi/firmware/issues/1098
   7
   8 Signed-off-by: mincepi <mincepi@gmail.com>
   9 ---
  10  arch/arm/boot/dts/overlays/Makefile           |  1 +
  11  arch/arm/boot/dts/overlays/README             | 31 ++++++++++++++++
  12  .../arm/boot/dts/overlays/ssd1306-overlay.dts | 36 +++++++++++++++++++
  13  3 files changed, 68 insertions(+)
  14  create mode 100644 arch/arm/boot/dts/overlays/ssd1306-overlay.dts
  15
  16 --- a/arch/arm/boot/dts/overlays/Makefile
  17 +++ b/arch/arm/boot/dts/overlays/Makefile
  18 @@ -135,6 +135,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
  19         spi2-1cs.dtbo \
  20         spi2-2cs.dtbo \
  21         spi2-3cs.dtbo \
  22 +       ssd1306.dtbo \
  23         superaudioboard.dtbo \
  24         sx150x.dtbo \
  25         tc358743.dtbo \
  26 --- a/arch/arm/boot/dts/overlays/README
  27 +++ b/arch/arm/boot/dts/overlays/README
  28 @@ -1950,6 +1950,37 @@ Params: cs0_pin                 GPIO pin
  29                                  is 'okay' or enabled).
  30
  31
  32 +Name:   ssd1306
  33 +Info:   Overlay for activation of SSD1306 over I2C OLED display framebuffer.
  34 +Load:   dtoverlay=ssd1306,<param>=<val>
  35 +Params: address                 Location in display memory of first character.
  36 +                                (default=0)
  37 +        width                   Width of display. (default=128)
  38 +        height                  Height of display. (default=64)
  39 +        offset                  virtual channel a. (default=0)
  40 +        normal                  Has no effect on displays tested. (default=not
  41 +                                set)
  42 +        sequential              Set this if every other scan line is missing.
  43 +                                (default=not set)
  44 +        remapped                Set this if display is garbled. (default=not
  45 +                                set)
  46 +        inverted                Set this if display is inverted and mirrored.
  47 +                                (default=not set)
  48 +
  49 +        Examples:
  50 +        Typical usage for 128x64 display: dtoverlay=ssd1306,inverted
  51 +
  52 +        Typical usage for 128x32 display: dtoverlay=ssd1306,inverted,sequential
  53 +
  54 +        i2c_baudrate=400000 will speed up the display.
  55 +
  56 +        i2c_baudrate=1000000 seems to work even though it's not officially
  57 +        supported by the hardware, and is faster still.
  58 +
  59 +        For more information refer to the device datasheet at:
  60 +        https://cdn-shop.adafruit.com/datasheets/SSD1306.pdf
  61 +
  62 +
  63  Name:   superaudioboard
  64  Info:   Configures the SuperAudioBoard sound card
  65  Load:   dtoverlay=superaudioboard,<param>=<val>
  66 --- /dev/null
  67 +++ b/arch/arm/boot/dts/overlays/ssd1306-overlay.dts
  68 @@ -0,0 +1,36 @@
  69 +// Overlay for SSD1306 128x64 and 128x32 OLED displays
  70 +/dts-v1/;
  71 +/plugin/;
  72 +
  73 +/ {
  74 +    compatible = "brcm,bcm2718";
  75 +
  76 +    fragment@0 {
  77 +       target = <&i2c1>;
  78 +       __overlay__ {
  79 +           status = "okay";
  80 +
  81 +           #address-cells = <1>;
  82 +           #size-cells = <0>;
  83 +
  84 +           ssd1306: oled@3c{
  85 +               compatible = "solomon,ssd1306fb-i2c";
  86 +               reg = <0x3c>;
  87 +               solomon,width = <128>;
  88 +               solomon,height = <64>;
  89 +               solomon,page-offset = <0>;
  90 +           };
  91 +       };
  92 +    };
  93 +
  94 +    __overrides__ {
  95 +       address = <&ssd1306>,"reg:0";
  96 +       width = <&ssd1306>,"solomon,width:0";
  97 +       height = <&ssd1306>,"solomon,height:0";
  98 +       offset = <&ssd1306>,"solomon,page-offset:0";
  99 +       normal = <&ssd1306>,"solomon,segment-no-remap?";
 100 +       sequential = <&ssd1306>,"solomon,com-seq?";
 101 +       remapped = <&ssd1306>,"solomon,com-lrremap?";
 102 +       inverted = <&ssd1306>,"solomon,com-invdir?";
 103 +    };
 104 +};