Kernel driver spi-sc18is602

Supported chips:

Author:
Guenter Roeck <linux@roeck-us.net>

Description

This driver provides connects a NXP SC18IS602/603 I2C-bus to SPI bridge to thekernel’s SPI core subsystem.

The driver does not probe for supported chips, since the SI18IS602/603 does notsupport Chip ID registers. You will have to instantiate the devices explicitly.Please see Documentation/i2c/instantiating-devices.rst for details.

Usage Notes

This driver requires the I2C adapter driver to support raw I2C messages. I2Cadapter drivers which can only handle the SMBus protocol are not supported.

The maximum SPI message size supported by SC18IS602/603 is 200 bytes. Attemptsto initiate longer transfers will fail with -EINVAL. EEPROM read operations andsimilar large accesses have to be split into multiple chunks of no more than200 bytes per SPI message (128 bytes of data per message is recommended). Thismeans that programs such as “cp” or “od”, which automatically use large blocksizes to access a device, can not be used directly to read data from EEPROM.Programs such as dd, where the block size can be specified, should be usedinstead.