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mctp i2c: MCTP I2C binding driver

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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>
This commit is contained in:
Matt Johnston 2022-02-18 13:51:06 +08:00 committed by David S. Miller
parent 6881e493b0
commit f5b8abf9fc
3 changed files with 1094 additions and 0 deletions
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12
drivers/net/mctp/Kconfig
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@ -21,6 +21,18 @@ config MCTP_SERIAL
Say y here if you need to connect to MCTP endpoints over serial. To
compile as a module, use m; the module will be called mctp-serial.
config MCTP_TRANSPORT_I2C
tristate "MCTP SMBus/I2C transport"
# i2c-mux is optional, but we must build as a module if i2c-mux is a module
depends on I2C_MUX || !I2C_MUX
depends on I2C
depends on I2C_SLAVE
select MCTP_FLOWS
help
Provides a driver to access MCTP devices over SMBus/I2C transport,
from DMTF specification DSP0237. A MCTP protocol network device is
created for each I2C bus that has been assigned a mctp-i2c device.
endmenu
endif

1
drivers/net/mctp/Makefile
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@ -1 +1,2 @@
obj-$(CONFIG_MCTP_SERIAL) += mctp-serial.o
obj-$(CONFIG_MCTP_TRANSPORT_I2C) += mctp-i2c.o

1081
drivers/net/mctp/mctp-i2c.c Normal file
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