Hi
I am using im8mq-evk board to test out a SPI to CAN converter. Namely the MCP2515 chip. I connected to ECSPI1 Signals with disconnecting the stuff on the evk board.
I removed all other uses of the pins from DTS file and added the pin configuration to iomuxc
pinctrl_ecspi1: ecspi1grp {
fsl,pins = <
MX8MQ_IOMUXC_ECSPI1_MOSI_ECSPI1_MOSI 0x10b0
MX8MQ_IOMUXC_ECSPI1_MISO_ECSPI1_MISO 0x10b0
MX8MQ_IOMUXC_ECSPI1_SCLK_ECSPI1_SCLK 0x10b0
>;
};
pinctrl_ecspi1_cs: ecspi1grp_cs {
fsl,pins = <
MX8MQ_IOMUXC_ECSPI1_SS0_ECSPI1_SS0 0x10b0
>;
};
pinctrl_ecspi1irq: ecspi1irqgrp {
fsl,pins = <
MX8MQ_IOMUXC_UART3_TXD_GPIO5_IO27 0x4000056
>;
};
I also added DTS node for the clock of the chip and for ECSPI1
/ {
...
clocks {
can0_osc: clock@7 {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <8000000>;
};
};
}
&ecspi1 {
fsl,spi-num-chipselects = <1>;
cs-gpios = <&gpio5 9 GPIO_ACTIVE_LOW>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1 &pinctrl_ecspi1_cs>;
status = "okay";
can0: mcp2515@0 {
#address-cells = <1>;
#size-cells = <0>;
reg = <0>;
compatible = "microchip,mcp2515";
spi-max-frequency = <10000000>;
clocks = <&can0_osc>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi1irq>;
interrupt-parent = <&gpio5>;
interrupts = <27 IRQ_TYPE_EDGE_FALLING>;
};
};
For the kernel I added builtin support for mcp251x devices.
After booting up I do not get a clock signal on SCLK pin. I do not get any recognized devices on SPI bus. But I can see that device support is available.
root@imx8mqevk:~# ls /sys/bus/spi/drivers
ds3234 m25p80 mcp251x mmc_spi mtd_dataflash spidev
root@imx8mqevk:~# ls /sys/bus/spi/devices/
root@imx8mqevk:~#
