mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 20:05:14 +07:00
37 lines
1.3 KiB
Plaintext
37 lines
1.3 KiB
Plaintext
|
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.
|