netdev - Re: [PATCH net-next v5 1/2] dt-bindings: net: New binding mctp-i2c-controller

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Message-ID: <Yg0eTtiChnmfJeqX@ninjato>
Date:   Wed, 16 Feb 2022 16:54:54 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Matt Johnston <matt@...econstruct.com.au>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jeremy Kerr <jk@...econstruct.com.au>,
        linux-i2c@...r.kernel.org, netdev@...r.kernel.org,
        Zev Weiss <zev@...ilderbeest.net>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH net-next v5 1/2] dt-bindings: net: New binding
 mctp-i2c-controller

On Thu, Feb 10, 2022 at 02:36:50PM +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@...econstruct.com.au>
> Reviewed-by: Rob Herring <robh@...nel.org>

Acked-by: Wolfram Sang <wsa@...nel.org>


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