linux/Documentation/spi/spi-sc18is602.rst
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   1===========================
   2Kernel driver spi-sc18is602
   3===========================
   4
   5Supported chips:
   6
   7  * NXP SI18IS602/602B/603
   8
   9    Datasheet: https://www.nxp.com/documents/data_sheet/SC18IS602_602B_603.pdf
  10
  11Author:
  12        Guenter Roeck <linux@roeck-us.net>
  13
  14
  15Description
  16-----------
  17
  18This driver provides connects a NXP SC18IS602/603 I2C-bus to SPI bridge to the
  19kernel's SPI core subsystem.
  20
  21The driver does not probe for supported chips, since the SI18IS602/603 does not
  22support Chip ID registers. You will have to instantiate the devices explicitly.
  23Please see Documentation/i2c/instantiating-devices.rst for details.
  24
  25
  26Usage Notes
  27-----------
  28
  29This driver requires the I2C adapter driver to support raw I2C messages. I2C
  30adapter drivers which can only handle the SMBus protocol are not supported.
  31
  32The maximum SPI message size supported by SC18IS602/603 is 200 bytes. Attempts
  33to initiate longer transfers will fail with -EINVAL. EEPROM read operations and
  34similar large accesses have to be split into multiple chunks of no more than
  35200 bytes per SPI message (128 bytes of data per message is recommended). This
  36means that programs such as "cp" or "od", which automatically use large block
  37sizes to access a device, can not be used directly to read data from EEPROM.
  38Programs such as dd, where the block size can be specified, should be used
  39instead.
  40