BeagleBone Black Enable SPIDEV
Start nano
nano BB-SPI1-01-00A0.dts
Copy-paste this into the file:
/dts-v1/; /plugin/; / { compatible = "ti,beaglebone", "ti,beaglebone-black"; /* identification */ part-number = "BB-SPI1-01"; /* version */ version = "00A0"; /* state the resources this cape uses */ exclusive-use = /* the pin header uses */ "P9.31", "P9.29", "P9.30", "P9.28", "P9.13", "P9.12", "spi1"; fragment@0 { target = <&am33xx_pinmux>; __overlay__ { pinctrl_spi1: pinctrl_spi1_pins { pinctrl-single,pins = < 0x190 0x13 /* P9_31 = mcasp0_aclkx.spi1_sclk , OUTPUT_PULLUP | MODE3 */ 0x194 0x33 /* P9_29 = mcasp0_fsx.spi1_d0 , INPUT_PULLUP | MODE3 */ 0x198 0x13 /* P9_30 = mcasp0_axr0.spi1_d1 , OUTPUT_PULLUP | MODE3 */ 0x19c 0x13 /* P9_28 = mcasp0_ahclkr.spi1_cs0 , OUTPUT_PULLUP | MODE3 */ 0x164 0x12 /* P9_42 = GPIO0_7 = eCAP0_in_PWM0_out.gpio0[7] , OUTPUT_PULLUP | MODE2 */ >; }; }; }; fragment@1 { target = <&spi1>; __overlay__ { #address-cells = <1>; #size-cells = <0>; status = "okay"; pinctrl-names = "default"; pinctrl-0 = <&pinctrl_spi1>; cs-gpios = <&gpio4 17 0>, <&gpio1 7 0>; spi1_0{ #address-cells = <1>; #size-cells = <0>; compatible = "spidev"; reg = <0>; spi-max-frequency = <16000000>; spi-cpha; }; spi1_1{ #address-cells = <1>; #size-cells = <0>; compatible = "spidev"; reg = <1>; spi-max-frequency = <16000000>; // Mode 0 (CPOL = 0, CPHA = 0) }; }; }; };
Close the file (Ctrl-o, Ctrl-x) and compile using dtc:
dtc -O dtb -o BB-SPI1-01-00A0.dtbo -b 0 -@ BB-SPI1-01-00A0.dts
Then, copy the file into /lib/firmware/:
cp BB-SPI1-01-00A0.dtbo /lib/firmware/
Then enable the device tree overlay:
echo BB-SPI1-01 > /sys/devices/bone_capemgr.*/slots
Make sure it is enabled You should now have two spidev-files in the folder /dev/
ls -al /dev/spidev1.*
You should also be able to see the pingroups:
cat /sys/kernel/debug/pinctrl/44e10800.pinmux/pingroups