diff options
Diffstat (limited to 'Documentation/spi')
| -rw-r--r-- | Documentation/spi/ep93xx_spi | 2 | ||||
| -rw-r--r-- | Documentation/spi/spi-sc18is602 | 36 |
2 files changed, 37 insertions, 1 deletions
diff --git a/Documentation/spi/ep93xx_spi b/Documentation/spi/ep93xx_spi index d8eb01c15db1..832ddce6e5fb 100644 --- a/Documentation/spi/ep93xx_spi +++ b/Documentation/spi/ep93xx_spi @@ -26,7 +26,7 @@ arch/arm/mach-ep93xx/ts72xx.c: #include <linux/gpio.h> #include <linux/spi/spi.h> -#include <mach/ep93xx_spi.h> +#include <linux/platform_data/spi-ep93xx.h> /* this is our GPIO line used for chip select */ #define MMC_CHIP_SELECT_GPIO EP93XX_GPIO_LINE_EGPIO9 diff --git a/Documentation/spi/spi-sc18is602 b/Documentation/spi/spi-sc18is602 new file mode 100644 index 000000000000..a45702865a38 --- /dev/null +++ b/Documentation/spi/spi-sc18is602 @@ -0,0 +1,36 @@ +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. |