This series adds an algorithm for an I2C master physically located on an FSI slave device. The I2C master has multiple ports, each of which may be connected to an I2C slave. Access to the I2C master registers is achieved over FSI bus. Due to the multi-port nature of the I2C master, the driver instantiates a new I2C adapter for each port connected to a slave. The connected ports should be defined in the device tree under the I2C master device. Changes since v8 - Drop unecessary else statements - Use i++ instead of ++i - Use kzalloc/kfree instead of devm_kzalloc/devm_kfree for port structure - Drop the list_empty check in remove Changes since v7 - Fix grammer in Kconfig (a -> an) - Change I2C registers to use BIT and GENMASK - Remove custom macros and use FIELD_PREP and FIELD_GET - Fix a few unecessary initializations and "return rc" that are always zero - Clean up the read/write fifo functions a bit - Few other clean-up items Changes since v6 - Remove spinlock for reset functionality; it's unecessary and doesn't work with the latest FSI core. - Use a mutex instead of a semaphore, and don't wait for timeout to get the lock. - Use usleeps instead of schedule_timeout; it's not worth the overhead when the wait should be very short in between sending the command and receiving the response. Changes since v5 - Fix reset functionality and do a reset after every transfer failure Eddie James (7): dt-bindings: i2c: Add FSI-attached I2C master dt binding documentation i2c: Add FSI-attached I2C master algorithm i2c: fsi: Add port structures i2c: fsi: Add abort and hardware reset procedures i2c: fsi: Add transfer implementation i2c: fsi: Add I2C master locking i2c: fsi: Add bus recovery Documentation/devicetree/bindings/i2c/i2c-fsi.txt | 40 ++ drivers/i2c/busses/Kconfig | 11 + drivers/i2c/busses/Makefile | 1 + drivers/i2c/busses/i2c-fsi.c | 721 ++++++++++++++++++++++ 4 files changed, 773 insertions(+) create mode 100644 Documentation/devicetree/bindings/i2c/i2c-fsi.txt create mode 100644 drivers/i2c/busses/i2c-fsi.c -- 1.8.3.1
