target/linux/brcm2708/patches-4.1/0108-Added-support-for-2-mcp2515-CAN-Bus-IC.patch

   1 From 298e839b5159e62739d98875162132fb8e1d8409 Mon Sep 17 00:00:00 2001
   2 From: petit-miner <cooker5000@gmail.com>
   3 Date: Fri, 10 Jul 2015 13:59:18 +0200
   4 Subject: [PATCH 108/222] Added support for 2 mcp2515 CAN Bus IC
   5
   6 See: https://github.com/raspberrypi/linux/issues/1018
   7      https://github.com/raspberrypi/linux/pull/1049
   8      https://github.com/raspberrypi/linux/pull/1052
   9 ---
  10  arch/arm/boot/dts/overlays/Makefile                |  1 +
  11  arch/arm/boot/dts/overlays/README                  | 12 +++-
  12  .../arm/boot/dts/overlays/mcp2515-can1-overlay.dts | 69 ++++++++++++++++++++++
  13  3 files changed, 81 insertions(+), 1 deletion(-)
  14  create mode 100644 arch/arm/boot/dts/overlays/mcp2515-can1-overlay.dts
  15
  16 --- a/arch/arm/boot/dts/overlays/Makefile
  17 +++ b/arch/arm/boot/dts/overlays/Makefile
  18 @@ -29,6 +29,7 @@ dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-ov
  19  dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb
  20  dtb-$(RPI_DT_OVERLAYS) += lirc-rpi-overlay.dtb
  21  dtb-$(RPI_DT_OVERLAYS) += mcp2515-can0-overlay.dtb
  22 +dtb-$(RPI_DT_OVERLAYS) += mcp2515-can1-overlay.dtb
  23  dtb-$(RPI_DT_OVERLAYS) += mmc-overlay.dtb
  24  dtb-$(RPI_DT_OVERLAYS) += mz61581-overlay.dtb
  25  dtb-$(RPI_DT_OVERLAYS) += piscreen-overlay.dtb
  26 --- a/arch/arm/boot/dts/overlays/README
  27 +++ b/arch/arm/boot/dts/overlays/README
  28 @@ -328,11 +328,21 @@ Params: gpio_out_pin             GPIO fo
  29
  30
  31  Name:   mcp2515-can0
  32 -Info:   Configures the MCP2515 CAN controller
  33 +Info:   Configures the MCP2515 CAN controller on spi0.0
  34  Load:   dtoverlay=mcp2515-can0,<param>=<val>
  35  Params: oscillator               Clock frequency for the CAN controller (Hz)
  36
  37          spimaxfrequency          Maximum SPI frequence (Hz)
  38 +
  39 +        interrupt                GPIO for interrupt signal
  40 +
  41 +
  42 +Name:   mcp2515-can1
  43 +Info:   Configures the MCP2515 CAN controller on spi0.1
  44 +Load:   dtoverlay=mcp2515-can1,<param>=<val>
  45 +Params: oscillator               Clock frequency for the CAN controller (Hz)
  46 +
  47 +        spimaxfrequency          Maximum SPI frequence (Hz)
  48
  49          interrupt                GPIO for interrupt signal
  50
  51 --- /dev/null
  52 +++ b/arch/arm/boot/dts/overlays/mcp2515-can1-overlay.dts
  53 @@ -0,0 +1,69 @@
  54 +/*
  55 + * Device tree overlay for mcp251x/can1 on spi0.1 edited by petit_miner
  56 + */
  57 +
  58 +/dts-v1/;
  59 +/plugin/;
  60 +
  61 +/ {
  62 +    compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709";
  63 +    /* disable spi-dev for spi0.1 */
  64 +    fragment@0 {
  65 +        target = <&spi0>;
  66 +        __overlay__ {
  67 +            status = "okay";
  68 +            spidev@1{
  69 +                status = "disabled";
  70 +            };
  71 +        };
  72 +    };
  73 +
  74 +    /* the interrupt pin of the can-controller */
  75 +    fragment@1 {
  76 +        target = <&gpio>;
  77 +        __overlay__ {
  78 +            can1_pins: can1_pins {
  79 +                brcm,pins = <25>;
  80 +                brcm,function = <0>; /* input */
  81 +            };
  82 +        };
  83 +    };
  84 +
  85 +    /* the clock/oscillator of the can-controller */
  86 +    fragment@2 {
  87 +        target-path = "/clocks";
  88 +        __overlay__ {
  89 +            /* external oscillator of mcp2515 on spi0.1 */
  90 +            can1_osc: can1_osc {
  91 +                compatible = "fixed-clock";
  92 +                #clock-cells = <0>;
  93 +                clock-frequency  = <16000000>;
  94 +            };
  95 +        };
  96 +    };
  97 +
  98 +    /* the spi config of the can-controller itself binding everything together */
  99 +    fragment@3 {
 100 +        target = <&spi0>;
 101 +        __overlay__ {
 102 +            /* needed to avoid dtc warning */
 103 +            #address-cells = <1>;
 104 +            #size-cells = <0>;
 105 +            can1: mcp2515@1 {
 106 +                reg = <1>;
 107 +                compatible = "microchip,mcp2515";
 108 +                pinctrl-names = "default";
 109 +                pinctrl-0 = <&can1_pins>;
 110 +                spi-max-frequency = <10000000>;
 111 +                interrupt-parent = <&gpio>;
 112 +                interrupts = <25 0x2>;
 113 +                clocks = <&can1_osc>;
 114 +            };
 115 +        };
 116 +    };
 117 +    __overrides__ {
 118 +        oscillator = <&can1_osc>,"clock-frequency:0";
 119 +        spimaxfrequency = <&can1>,"spi-max-frequency:0";
 120 +        interrupt = <&can1_pins>,"brcm,pins:0",<&can1>,"interrupts:0";
 121 +    };
 122 +};