This series of patches adds support of two new features which will be introduced with Atmel sama5d2x SoC. First, the alternative command mode eases the sending of STOP conditions. Before starting an I2C transaction, the size data to be transfered is written into the new Alternative Command Register. For each byte transferred, the I2C controller decreases this counter and automatically sends a STOP condition when the counter value reaches 0, that is to say when the last byte of the transaction has been sent/received. So there is no longer need to set the STOP bit into the Control Register. Then the use of FIFOs allows to reduce number I/O accesses: for instance, the TX FIFO allows to write up to 4 data in a single access to the Transmit Holding Register. Also the RX FIFO allows to read up to 4 data in a single access to the Receive Holding Register. Currently only DMA transfers take advantage of FIFOs. Cyrille Pitchen (3): i2c: at91: add support for new alternative command mode i2c: at91: print hardware version i2c: at91: add support to FIFOs drivers/i2c/busses/i2c-at91.c | 347 +++++++++++++++++++++++++++++++++++------- 1 file changed, 288 insertions(+), 59 deletions(-) -- 1.8.2.2 -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
