arch/arm/boot/dts/overlays/rpi-display-overlay.dts

   1 /*
   2  * Device Tree overlay for rpi-display by Watterott
   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                         rpi_display_pins: rpi_display_pins {
  37                                 brcm,pins = <18 23 24 25>;
  38                                 brcm,function = <1 1 1 0>; /* out out out in */
  39                                 brcm,pull = <0 0 0 2>; /* - - - up */
  40                         };
  41                 };
  42         };
  43
  44         fragment@4 {
  45                 target = <&spi0>;
  46                 __overlay__ {
  47                         /* needed to avoid dtc warning */
  48                         #address-cells = <1>;
  49                         #size-cells = <0>;
  50
  51                         rpidisplay: rpi-display@0{
  52                                 compatible = "ilitek,ili9341";
  53                                 reg = <0>;
  54                                 pinctrl-names = "default";
  55                                 pinctrl-0 = <&rpi_display_pins>;
  56
  57                                 spi-max-frequency = <32000000>;
  58                                 rotate = <270>;
  59                                 bgr;
  60                                 fps = <30>;
  61                                 buswidth = <8>;
  62                                 reset-gpios = <&gpio 23 1>;
  63                                 dc-gpios = <&gpio 24 0>;
  64                                 led-gpios = <&gpio 18 0>;
  65                                 debug = <0>;
  66                         };
  67
  68                         rpidisplay_ts: rpi-display-ts@1 {
  69                                 compatible = "ti,ads7846";
  70                                 reg = <1>;
  71
  72                                 spi-max-frequency = <2000000>;
  73                                 interrupts = <25 2>; /* high-to-low edge triggered */
  74                                 interrupt-parent = <&gpio>;
  75                                 pendown-gpio = <&gpio 25 1>;
  76                                 ti,x-plate-ohms = /bits/ 16 <60>;
  77                                 ti,pressure-max = /bits/ 16 <255>;
  78                         };
  79                 };
  80         };
  81
  82         fragment@10 {
  83                 target = <&rpidisplay>;
  84                 __dormant__  {
  85                         backlight = <&backlight_gpio>;
  86                 };
  87         };
  88
  89         fragment@11 {
  90                 target-path = "/";
  91                 __dormant__  {
  92                         backlight_gpio: backlight_gpio {
  93                                 compatible = "gpio-backlight";
  94                                 gpios = <&gpio 18 0>; /* GPIO_ACTIVE_HIGH */
  95                         };
  96                 };
  97         };
  98
  99         fragment@20 {
 100                 target = <&rpidisplay>;
 101                 __dormant__  {
 102                         backlight = <&backlight_pwm>;
 103                 };
 104         };
 105
 106         fragment@21 {
 107                 target-path = "/";
 108                 __dormant__  {
 109                         backlight_pwm: backlight_pwm {
 110                                 compatible = "pwm-backlight";
 111                                 brightness-levels = <0 6 8 12 16 24 32 40 48 64 96 128 160 192 224 255>;
 112                                 default-brightness-level = <16>;
 113                                 pwms = <&pwm 0 200000>;
 114                         };
 115                 };
 116         };
 117
 118         fragment@22 {
 119                 target = <&pwm>;
 120                 __dormant__ {
 121                         assigned-clock-rates = <1000000>;
 122                         status = "okay";
 123                 };
 124         };
 125
 126         fragment@23 {
 127                 target = <&audio>;
 128                 __dormant__  {
 129                     brcm,disable-headphones;
 130                 };
 131         };
 132
 133         __overrides__ {
 134                 speed =     <&rpidisplay>,"spi-max-frequency:0";
 135                 rotate =    <&rpidisplay>,"rotate:0", /* fbtft */
 136                             <&rpidisplay>,"rotation:0"; /* drm */
 137                 fps =       <&rpidisplay>,"fps:0";
 138                 debug =     <&rpidisplay>,"debug:0";
 139                 xohms =     <&rpidisplay_ts>,"ti,x-plate-ohms;0";
 140                 swapxy =    <&rpidisplay_ts>,"ti,swap-xy?";
 141                 backlight = <&rpidisplay>,"led-gpios:4",
 142                             <&rpi_display_pins>,"brcm,pins:0";
 143                 drm =       <&rpidisplay>, "compatible=multi-inno,mi0283qt",
 144                             <&rpidisplay>, "spi-max-frequency:0=70000000",
 145                             <&rpidisplay>, "reset-gpios:8=0", /* GPIO_ACTIVE_HIGH */
 146                             <0>, "+10+11";
 147                 backlight-pwm = <0>, "-10-11+20+21+22+23",
 148                                 <&rpi_display_pins>, "brcm,function:0=2"; /* Alt5 */
 149         };
 150 };