Compatibility layer provides very easy to use SPI bone bus nodes that allows anybody to create compatible overlays for BBBWl, BBB, & BBAI. The format followed for these nodes is bone_i2c_#. For the definitions, you can see bbai-bone-buses.dtsi#L406 & bbb-bone-buses.dtsi#L423.
| Overlay |
|---|
| BONE-SPI0_0.dts |
| BBAI-SPI0_1.dts |
| BONE-SPI1_0.dts |
| BONE-SPI1_1.dts |
| Bone bus | BBBWL/BBB | BBAI | MOSI | MISO | CLK | CS |
|---|---|---|---|---|---|---|
| /dev/bone/spi/0.x | SPI0 | SPI2 | P9.18 | P9.21 | P9.22 | P9.17 (CS0) P9.23 (CS1 - BBAI only) |
| /dev/bone/spi/1.x | SPI1 | SPI3 | P9.30 | P9.29 | P9.31 | P9.28 (CS0) P9.42 (CS1) |