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| author | Matt Johnston <matt@codeconstruct.com.au> | 2022-02-18 13:51:05 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2022-02-19 16:18:49 +0000 |
| commit | 6881e493b08fe1ab9dd132333c01e7581950e1c2 (patch) | |
| tree | a06c6b1c0f76919cfbddd907f60c5fe3f8c32074 /Documentation/devicetree/bindings/i2c | |
| parent | 4b340a5a726dafba15b366c4009aa0a8f77631ac (diff) | |
dt-bindings: net: New binding mctp-i2c-controller
Used to define a local endpoint to communicate with MCTP peripherals
attached to an I2C bus. This I2C endpoint can communicate with remote
MCTP devices on the I2C bus.
In the example I2C topology below (matching the second yaml example) we
have MCTP devices on busses i2c1 and i2c6. MCTP-supporting busses are
indicated by the 'mctp-controller' DT property on an I2C bus node.
A mctp-i2c-controller I2C client DT node is placed at the top of the
mux topology, since only the root I2C adapter will support I2C slave
functionality.
.-------.
|eeprom |
.------------. .------. /'-------'
| adapter | | mux --@0,i2c5------'
| i2c1 ----.*| --@1,i2c6--.--.
|............| \'------' \ \ .........
| mctp-i2c- | \ \ \ .mctpB .
| controller | \ \ '.0x30 .
| | \ ......... \ '.......'
| 0x50 | \ .mctpA . \ .........
'------------' '.0x1d . '.mctpC .
'.......' '.0x31 .
'.......'
(mctpX boxes above are remote MCTP devices not included in the DT at
present, they can be hotplugged/probed at runtime. A DT binding for
specific fixed MCTP devices could be added later if required)
Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/devicetree/bindings/i2c')
| -rw-r--r-- | Documentation/devicetree/bindings/i2c/i2c.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt index b864916e087f..fc3dd7ec0445 100644 --- a/Documentation/devicetree/bindings/i2c/i2c.txt +++ b/Documentation/devicetree/bindings/i2c/i2c.txt @@ -95,6 +95,10 @@ wants to support one of the below features, it should adapt these bindings. - smbus-alert states that the optional SMBus-Alert feature apply to this bus. +- mctp-controller + indicates that the system is accessible via this bus as an endpoint for + MCTP over I2C transport. + Required properties (per child device) -------------------------------------- |