From 5c8148df6f5147fcaa9fe81425b58a3e7a64cdba Mon Sep 17 00:00:00 2001 From: petit-miner Date: Fri, 10 Jul 2015 13:59:18 +0200 Subject: [PATCH 108/121] Added support for 2 mcp2515 CAN Bus IC See: https://github.com/raspberrypi/linux/issues/1018 https://github.com/raspberrypi/linux/pull/1049 https://github.com/raspberrypi/linux/pull/1052 --- arch/arm/boot/dts/overlays/Makefile | 1 + arch/arm/boot/dts/overlays/README | 12 +++- .../arm/boot/dts/overlays/mcp2515-can1-overlay.dts | 69 ++++++++++++++++++++++ 3 files changed, 81 insertions(+), 1 deletion(-) create mode 100644 arch/arm/boot/dts/overlays/mcp2515-can1-overlay.dts --- a/arch/arm/boot/dts/overlays/Makefile +++ b/arch/arm/boot/dts/overlays/Makefile @@ -29,6 +29,7 @@ dtb-$(RPI_DT_OVERLAYS) += iqaudio-dac-ov dtb-$(RPI_DT_OVERLAYS) += iqaudio-dacplus-overlay.dtb dtb-$(RPI_DT_OVERLAYS) += lirc-rpi-overlay.dtb dtb-$(RPI_DT_OVERLAYS) += mcp2515-can0-overlay.dtb +dtb-$(RPI_DT_OVERLAYS) += mcp2515-can1-overlay.dtb dtb-$(RPI_DT_OVERLAYS) += mmc-overlay.dtb dtb-$(RPI_DT_OVERLAYS) += mz61581-overlay.dtb dtb-$(RPI_DT_OVERLAYS) += piscreen-overlay.dtb --- a/arch/arm/boot/dts/overlays/README +++ b/arch/arm/boot/dts/overlays/README @@ -328,11 +328,21 @@ Params: gpio_out_pin GPIO fo Name: mcp2515-can0 -Info: Configures the MCP2515 CAN controller +Info: Configures the MCP2515 CAN controller on spi0.0 Load: dtoverlay=mcp2515-can0,= Params: oscillator Clock frequency for the CAN controller (Hz) spimaxfrequency Maximum SPI frequence (Hz) + + interrupt GPIO for interrupt signal + + +Name: mcp2515-can1 +Info: Configures the MCP2515 CAN controller on spi0.1 +Load: dtoverlay=mcp2515-can1,= +Params: oscillator Clock frequency for the CAN controller (Hz) + + spimaxfrequency Maximum SPI frequence (Hz) interrupt GPIO for interrupt signal --- /dev/null +++ b/arch/arm/boot/dts/overlays/mcp2515-can1-overlay.dts @@ -0,0 +1,69 @@ +/* + * Device tree overlay for mcp251x/can1 on spi0.1 edited by petit_miner + */ + +/dts-v1/; +/plugin/; + +/ { + compatible = "brcm,bcm2835", "brcm,bcm2836", "brcm,bcm2708", "brcm,bcm2709"; + /* disable spi-dev for spi0.1 */ + fragment@0 { + target = <&spi0>; + __overlay__ { + status = "okay"; + spidev@1{ + status = "disabled"; + }; + }; + }; + + /* the interrupt pin of the can-controller */ + fragment@1 { + target = <&gpio>; + __overlay__ { + can1_pins: can1_pins { + brcm,pins = <25>; + brcm,function = <0>; /* input */ + }; + }; + }; + + /* the clock/oscillator of the can-controller */ + fragment@2 { + target-path = "/clocks"; + __overlay__ { + /* external oscillator of mcp2515 on spi0.1 */ + can1_osc: can1_osc { + compatible = "fixed-clock"; + #clock-cells = <0>; + clock-frequency = <16000000>; + }; + }; + }; + + /* the spi config of the can-controller itself binding everything together */ + fragment@3 { + target = <&spi0>; + __overlay__ { + /* needed to avoid dtc warning */ + #address-cells = <1>; + #size-cells = <0>; + can1: mcp2515@1 { + reg = <1>; + compatible = "microchip,mcp2515"; + pinctrl-names = "default"; + pinctrl-0 = <&can1_pins>; + spi-max-frequency = <10000000>; + interrupt-parent = <&gpio>; + interrupts = <25 0x2>; + clocks = <&can1_osc>; + }; + }; + }; + __overrides__ { + oscillator = <&can1_osc>,"clock-frequency:0"; + spimaxfrequency = <&can1>,"spi-max-frequency:0"; + interrupt = <&can1_pins>,"brcm,pins:0",<&can1>,"interrupts:0"; + }; +};