netdev - Re: [patch net-next RFC 00/10] introduce line card support for modular switch

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Message-ID: <20210126113326.GO3565223@nanopsycho.orion>
Date:   Tue, 26 Jan 2021 12:33:26 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     David Ahern <dsahern@...il.com>, Jakub Kicinski <kuba@...nel.org>,
        netdev@...r.kernel.org, davem@...emloft.net,
        jacob.e.keller@...el.com, roopa@...dia.com, mlxsw@...dia.com,
        vadimp@...dia.com
Subject: Re: [patch net-next RFC 00/10] introduce line card support for
 modular switch

Fri, Jan 22, 2021 at 03:13:12PM CET, andrew@...n.ch wrote:
>> I don't see any way. The userspace is the one who can get the info, from
>> the i2c driver. The mlxsw driver has no means to get that info itself.
>
>Hi Jiri
>
>Please can you tell us more about this i2c driver. Do you have any
>architecture pictures?

Quoting Vadim Pasternak:
"
Not upstreamed yet.
It will be mlxreg-lc driver for line card in drivers/platfrom/mellanox and
additional mlxreg-pm for line card powering on/off, setting enable/disable
and handling power off upon thermal shutdown event.
"


>
>It is not unknown for one driver to embed another driver inside it. So
>the i2c driver could be inside the mlxsw. It is also possible to link
>drivers together, the mlxsw could go find the i2c driver and make use
>of its services.

Okay. Do you have examples? How could the kernel figure out the relation
of the instances?


>
>   Andrew