Linux kernel driver for Silicon Labs CP2130 USB-SPI Bridge

• datasheet: https://www.silabs.com/Support%20Documents/TechnicalDocs/CP2130.pdf

• for out-of-tree build please refer to https://www.kernel.org/doc/Documentation/kbuild/modules.txt

• sysfs API

  • irq_poll_interval: specifies the IRQ/GPIO poll interval in us.
  • channel_pdata: binary load of platform data for SPI driver. The create_pdata.c program gives an example how to create binary platform data for the mcp251x.
  • channel_config: attach SPI driver to certain channel, e. g. to plug the mcp251x CAN driver use echo -n 0,2,6,0,0,0,1,0,0,0,0,mcp2515 > /sys/.../channel_config or echo -n 0,2,-1,1,1,1,0,0,0,0,0,spidev > /sys/.../channel_config and echo -n 1,2,-1,1,1,1,0,0,0,0,0,spidev > /sys/.../channel_config ` for 2 general purpose spidev without IRQ support. For the values to be entered in the columns please refer to the CP2130 datasheet.
  • otp_rom: you can read the current OTP ROM settings and their lock status or write a new OTP ROM configuration, please make sure that you do the right thing, OTP means one-time-programmable!

• GPIO chip: the driver implements a GPIO chip for all GPIOs of the CP2130, they can be accessed from userspace using the sysfs GPIO API or directly from another driver.