Messages in this thread | | | From | Ravikumar Kattekola <> | Subject | [RFC 0/1] i2c: omap: Add support for switching to slave mode | Date | Wed, 25 May 2016 19:41:18 +0530 |
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I2C controller on most of the omap devices has both master and slave capability but the i2c framework has been missing support for registering a bus in slave mode for long. Recently the i2c slave support has been added to i2c framework, the following patch adds the required support for omap_i2c driver to register a controller as a slave device and be deriven by an external/internal master.
The slave interface requires us to add following mandatory events
1. I2C_SLAVE_WRITE_REQUESTED 2. I2C_SLAVE_READ_REQUESTED 3. I2C_SLAVE_WRITE_RECEIVED 4. I2C_SLAVE_READ_PROCESSED
and
5. I2C_SLAVE_STOP
The omap i2c controller (at least on dra7x devices) doesn't have start/stop (STT/STP) support for slave mode so event #5 is not implemented in the driver.
Refer to Documentation/i2c/slave-interface for more info on i2c-slave-interface and Documentation/i2c/slave-eeprom-backend for sample backend driver.
Tested on: DRA75x EVM Rev G3 and DRA72x EVM Rev B1 connected over i2c3 using DCAN2 lines [JP3]
Ravikumar Kattekola (1): drivers: i2c: omap: Add slave support
drivers/i2c/busses/i2c-omap.c | 144 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 144 insertions(+)
-- 2.8.2.396.g5fe494c
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