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Provides MCTP network transport over an I2C bus, as specified in DMTF DSP0237. All messages between nodes are sent as SMBus Block Writes. Each I2C bus to be used for MCTP is flagged in devicetree by a 'mctp-controller' property on the bus node. Each flagged bus gets a mctpi2cX net device created based on the bus number. A 'mctp-i2c-controller' I2C client needs to be added under the adapter. In an I2C mux situation the mctp-i2c-controller node must be attached only to the root I2C bus. The I2C client will handle incoming I2C slave block write data for subordinate busses as well as its own bus. In configurations without devicetree a driver instance can be attached to a bus using the I2C slave new_device mechanism. The MCTP core will hold/release the MCTP I2C device while responses are pending (a 6 second timeout or once a socket is closed, response received etc). While held the MCTP I2C driver will lock the I2C bus so that the correct I2C mux remains selected while responses are received. (Ideally we would just lock the mux to keep the current bus selected for the response rather than a full I2C bus lock, but that isn't exposed in the I2C mux API) Signed-off-by: Matt Johnston <matt@codeconstruct.com.au> Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au> Reviewed-by: Wolfram Sang <wsa@kernel.org> # I2C transport parts Signed-off-by: David S. Miller <davem@davemloft.net>
38 lines
1.2 KiB
Text
38 lines
1.2 KiB
Text
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if MCTP
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menu "MCTP Device Drivers"
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config MCTP_SERIAL
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tristate "MCTP serial transport"
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depends on TTY
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select CRC_CCITT
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help
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This driver provides an MCTP-over-serial interface, through a
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serial line-discipline, as defined by DMTF specification "DSP0253 -
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MCTP Serial Transport Binding". By attaching the ldisc to a serial
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device, we get a new net device to transport MCTP packets.
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This allows communication with external MCTP endpoints which use
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serial as their transport. It can also be used as an easy way to
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provide MCTP connectivity between virtual machines, by forwarding
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data between simple virtual serial devices.
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Say y here if you need to connect to MCTP endpoints over serial. To
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compile as a module, use m; the module will be called mctp-serial.
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config MCTP_TRANSPORT_I2C
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tristate "MCTP SMBus/I2C transport"
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# i2c-mux is optional, but we must build as a module if i2c-mux is a module
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depends on I2C_MUX || !I2C_MUX
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depends on I2C
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depends on I2C_SLAVE
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select MCTP_FLOWS
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help
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Provides a driver to access MCTP devices over SMBus/I2C transport,
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from DMTF specification DSP0237. A MCTP protocol network device is
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created for each I2C bus that has been assigned a mctp-i2c device.
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endmenu
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endif
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