| Kernel driver spi-sc18is602 | |
| =========================== | |
| Supported chips: | |
| * NXP SI18IS602/602B/603 | |
| Datasheet: http://www.nxp.com/documents/data_sheet/SC18IS602_602B_603.pdf | |
| Author: | |
| Guenter Roeck <linux@roeck-us.net> | |
| Description | |
| ----------- | |
| This driver provides connects a NXP SC18IS602/603 I2C-bus to SPI bridge to the | |
| kernel's SPI core subsystem. | |
| The driver does not probe for supported chips, since the SI18IS602/603 does not | |
| support Chip ID registers. You will have to instantiate the devices explicitly. | |
| Please see Documentation/i2c/instantiating-devices for details. | |
| Usage Notes | |
| ----------- | |
| This driver requires the I2C adapter driver to support raw I2C messages. I2C | |
| adapter drivers which can only handle the SMBus protocol are not supported. | |
| The maximum SPI message size supported by SC18IS602/603 is 200 bytes. Attempts | |
| to initiate longer transfers will fail with -EINVAL. EEPROM read operations and | |
| similar large accesses have to be split into multiple chunks of no more than | |
| 200 bytes per SPI message (128 bytes of data per message is recommended). This | |
| means that programs such as "cp" or "od", which automatically use large block | |
| sizes 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 used | |
| instead. |