Hey guys,
I am currently trying to get a CAN bus interface working upon the Hikey through the use of an MCP2515, which I have connected via the SPI within the Lo-speed connector.
It is of my understanding that to enable this, some slight modifications need to be made to the device tree files. I have not, however, been able to get the MCP2515 recognised as an SPI device, or the can0 interface to appear within Linux.
I am new to anything related to device trees, and so have made attempts at altering the approaches made within these two posts:
- http://www.96boards.org/forums/topic/get-can-bus-working-on-db410c-via-mcp2515/
- https://github.com/raspberrypi/firmware/issues/371
Currently my device tree file looks like the following:
#include "hikey-gpio.dtsi"
/{
aliases {
spi_0 = &spi_0 ;
};
clocks{
clk16m: oscillator {
#clock-cells = <0>;
compatible = "fixed-clock";
clock-frequency = <16000000>; //16MHz
};
};
soc{
spi_0: spi@f7106000 {
#address-cells = <1>;
#size-cells = <0>;
can0: mcp2515@0 {
compatible = "microchip,mcp2515";
reg = <0>;
clocks = <&clk16m>;
interrupt-parent = <&gpio2>;
interrupts = <0 0x2>;
spi-max-frequency = <10000000>; //10 MHz
};
};
};
};
I am not completely sure that I have setup the interrupt pin correctly. The interrupt pin I am using is pin 23 on the lo-speed connector, GPIO2_0.
If anyone with more experience could have a look and let me know what could be wrong with this code, it would be much appreciated!
