From: Wolfram Sang <wsa@kernel.org>
To: Matt Johnston <matt@codeconstruct.com.au>
Cc: devicetree@vger.kernel.org, linux-i2c@vger.kernel.org,
Jeremy Kerr <jk@codeconstruct.com.au>
Subject: Re: [PATCH v4] dt-bindings: net: New binding mctp-i2c-controller
Date: Wed, 29 Sep 2021 22:53:45 +0200 [thread overview]
Message-ID: <YVTSWa3Nw3XF5o48@kunai> (raw)
In-Reply-To: <20210923033406.3166902-1-matt@codeconstruct.com.au>
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On Thu, Sep 23, 2021 at 11:34:06AM +0800, Matt Johnston wrote:
> 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>
Acked-by: Wolfram Sang <wsa@kernel.org> # for the I2C part
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prev parent reply other threads:[~2021-09-29 20:53 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-23 3:34 [PATCH v4] dt-bindings: net: New binding mctp-i2c-controller Matt Johnston
2021-09-27 19:02 ` Rob Herring
2021-09-29 20:53 ` Wolfram Sang [this message]
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