0001 ===========================
0002 Kernel driver spi-sc18is602
0003 ===========================
0004
0005 Supported chips:
0006
0007 * NXP SI18IS602/602B/603
0008
0009 Datasheet: https://www.nxp.com/documents/data_sheet/SC18IS602_602B_603.pdf
0010
0011 Author:
0012 Guenter Roeck <linux@roeck-us.net>
0013
0014
0015 Description
0016 -----------
0017
0018 This driver provides connects a NXP SC18IS602/603 I2C-bus to SPI bridge to the
0019 kernel's SPI core subsystem.
0020
0021 The driver does not probe for supported chips, since the SI18IS602/603 does not
0022 support Chip ID registers. You will have to instantiate the devices explicitly.
0023 Please see Documentation/i2c/instantiating-devices.rst for details.
0024
0025
0026 Usage Notes
0027 -----------
0028
0029 This driver requires the I2C adapter driver to support raw I2C messages. I2C
0030 adapter drivers which can only handle the SMBus protocol are not supported.
0031
0032 The maximum SPI message size supported by SC18IS602/603 is 200 bytes. Attempts
0033 to initiate longer transfers will fail with -EINVAL. EEPROM read operations and
0034 similar large accesses have to be split into multiple chunks of no more than
0035 200 bytes per SPI message (128 bytes of data per message is recommended). This
0036 means that programs such as "cp" or "od", which automatically use large block
0037 sizes to access a device, can not be used directly to read data from EEPROM.
0038 Programs such as dd, where the block size can be specified, should be used
0039 instead.
