arch/arm/boot/dts/overlays/ssd1306-spi-overlay.dts

   1 /*
   2  * Device Tree overlay for SSD1306 based SPI OLED display
   3  *
   4  */
   5
   6 /dts-v1/;
   7 /plugin/;
   8
   9 / {
  10         compatible = "brcm,bcm2835";
  11
  12         fragment@0 {
  13                 target = <&spi0>;
  14                 __overlay__ {
  15                         status = "okay";
  16                 };
  17         };
  18
  19         fragment@1 {
  20                 target = <&spidev0>;
  21                 __overlay__ {
  22                         status = "disabled";
  23                 };
  24         };
  25
  26         fragment@2 {
  27                 target = <&spidev1>;
  28                 __overlay__ {
  29                         status = "disabled";
  30                 };
  31         };
  32
  33         fragment@3 {
  34                 target = <&gpio>;
  35                 __overlay__ {
  36                         ssd1306_pins: ssd1306_pins {
  37                                 brcm,pins = <25 24>;
  38                                 brcm,function = <1 1>; /* out out */
  39                         };
  40                 };
  41         };
  42
  43         fragment@4 {
  44                 target = <&spi0>;
  45                 __overlay__ {
  46                         /* needed to avoid dtc warning */
  47                         #address-cells = <1>;
  48                         #size-cells = <0>;
  49
  50                         ssd1306: ssd1306@0{
  51                                 compatible = "solomon,ssd1306";
  52                                 reg = <0>;
  53                                 pinctrl-names = "default";
  54                                 pinctrl-0 = <&ssd1306_pins>;
  55
  56                                 spi-max-frequency = <10000000>;
  57                                 bgr = <0>;
  58                                 bpp = <1>;
  59                                 rotate = <0>;
  60                                 fps = <25>;
  61                                 buswidth = <8>;
  62                                 reset-gpios = <&gpio 25 1>;
  63                                 dc-gpios = <&gpio 24 0>;
  64                                 debug = <0>;
  65
  66                                 solomon,height = <64>;
  67                                 solomon,width = <128>;
  68                                 solomon,page-offset = <0>;
  69                         };
  70                 };
  71         };
  72
  73         __overrides__ {
  74                 speed     = <&ssd1306>,"spi-max-frequency:0";
  75                 rotate    = <&ssd1306>,"rotate:0";
  76                 fps       = <&ssd1306>,"fps:0";
  77                 debug     = <&ssd1306>,"debug:0";
  78                 dc_pin    = <&ssd1306>,"dc-gpios:4",
  79                             <&ssd1306_pins>,"brcm,pins:4";
  80                 reset_pin = <&ssd1306>,"reset-gpios:4",
  81                             <&ssd1306_pins>,"brcm,pins:0";
  82                 height    = <&ssd1306>,"solomon,height:0";
  83         };
  84 };