arch/arm/boot/dts/overlays/pitft35-resistive-overlay.dts

   1 /*
   2  * Device Tree overlay for Adafruit PiTFT 3.5" resistive touch screen
   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                         pitft_pins: pitft_pins {
  37                                 brcm,pins = <24 25>;
  38                                 brcm,function = <0 1>; /* in out */
  39                                 brcm,pull = <2 0>; /* pullup none */
  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                         pitft: pitft@0{
  52                                 compatible = "himax,hx8357d", "adafruit,yx350hv15";
  53                                 reg = <0>;
  54                                 pinctrl-names = "default";
  55                                 pinctrl-0 = <&pitft_pins>;
  56
  57                                 spi-max-frequency = <32000000>;
  58                                 rotate = <90>;
  59                                 fps = <25>;
  60                                 bgr;
  61                                 buswidth = <8>;
  62                                 dc-gpios = <&gpio 25 0>;
  63                                 debug = <0>;
  64                         };
  65
  66                         pitft_ts@1 {
  67                                 compatible = "st,stmpe610";
  68                                 reg = <1>;
  69
  70                                 spi-max-frequency = <500000>;
  71                                 interrupts = <24 2>; /* high-to-low edge triggered */
  72                                 interrupt-parent = <&gpio>;
  73                                 interrupt-controller;
  74
  75                                 stmpe_touchscreen {
  76                                         compatible = "st,stmpe-ts";
  77                                         st,sample-time = <4>;
  78                                         st,mod-12b = <1>;
  79                                         st,ref-sel = <0>;
  80                                         st,adc-freq = <2>;
  81                                         st,ave-ctrl = <3>;
  82                                         st,touch-det-delay = <4>;
  83                                         st,settling = <2>;
  84                                         st,fraction-z = <7>;
  85                                         st,i-drive = <0>;
  86                                 };
  87
  88                                 stmpe_gpio: stmpe_gpio {
  89                                         #gpio-cells = <2>;
  90                                         compatible = "st,stmpe-gpio";
  91                                         /*
  92                                          * only GPIO2 is wired/available
  93                                          * and it is wired to the backlight
  94                                          */
  95                                         st,norequest-mask = <0x7b>;
  96                                 };
  97                         };
  98                 };
  99         };
 100
 101         fragment@5 {
 102                 target-path = "/soc";
 103                 __overlay__ {
 104                         backlight: backlight {
 105                                 compatible = "gpio-backlight";
 106                                 gpios = <&stmpe_gpio 2 0>;
 107                                 default-on;
 108                         };
 109                 };
 110         };
 111
 112         __overrides__ {
 113                 speed =   <&pitft>,"spi-max-frequency:0";
 114                 rotate =  <&pitft>,"rotate:0", /* fbtft */
 115                           <&pitft>,"rotation:0"; /* drm */
 116                 fps =     <&pitft>,"fps:0";
 117                 debug =   <&pitft>,"debug:0";
 118                 drm =     <&pitft>,"compatible=adafruit,yx350hv15",
 119                           <&pitft>,"backlight:0=",<&backlight>;
 120         };
 121 };