arch/arm/boot/dts/overlays/mcp2515-can0-overlay.dts

   1 /*
   2  * Device tree overlay for mcp251x/can0 on spi0.0
   3  */
   4
   5 /dts-v1/;
   6 /plugin/;
   7
   8 / {
   9     compatible = "brcm,bcm2835";
  10     /* disable spi-dev for spi0.0 */
  11     fragment@0 {
  12         target = <&spi0>;
  13         __overlay__ {
  14             status = "okay";
  15         };
  16     };
  17
  18     fragment@1 {
  19         target = <&spidev0>;
  20         __overlay__ {
  21             status = "disabled";
  22         };
  23     };
  24
  25     /* the interrupt pin of the can-controller */
  26     fragment@2 {
  27         target = <&gpio>;
  28         __overlay__ {
  29             can0_pins: can0_pins {
  30                 brcm,pins = <25>;
  31                 brcm,function = <0>; /* input */
  32             };
  33         };
  34     };
  35
  36     /* the clock/oscillator of the can-controller */
  37     fragment@3 {
  38         target-path = "/";
  39         __overlay__ {
  40             /* external oscillator of mcp2515 on SPI0.0 */
  41             can0_osc: can0_osc {
  42                 compatible = "fixed-clock";
  43                 #clock-cells = <0>;
  44                 clock-frequency  = <16000000>;
  45             };
  46         };
  47     };
  48
  49     /* the spi config of the can-controller itself binding everything together */
  50     fragment@4 {
  51         target = <&spi0>;
  52         __overlay__ {
  53             /* needed to avoid dtc warning */
  54             #address-cells = <1>;
  55             #size-cells = <0>;
  56             can0: mcp2515@0 {
  57                 reg = <0>;
  58                 compatible = "microchip,mcp2515";
  59                 pinctrl-names = "default";
  60                 pinctrl-0 = <&can0_pins>;
  61                 spi-max-frequency = <10000000>;
  62                 interrupt-parent = <&gpio>;
  63                 interrupts = <25 8>; /* IRQ_TYPE_LEVEL_LOW */
  64                 clocks = <&can0_osc>;
  65             };
  66         };
  67     };
  68     __overrides__ {
  69         oscillator = <&can0_osc>,"clock-frequency:0";
  70         spimaxfrequency = <&can0>,"spi-max-frequency:0";
  71         interrupt = <&can0_pins>,"brcm,pins:0",<&can0>,"interrupts:0";
  72     };
  73 };