netdev - Re: [PATCH v1 1/2] driver core: fw_devlink: Add support for FWNODE_FLAG_BROKEN

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Message-ID: <YTEMs1mMIT/Z0c4H@lunn.ch>
Date:   Thu, 2 Sep 2021 19:41:07 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Saravana Kannan <saravanak@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, Len Brown <lenb@...nel.org>,
        Alvin Sipraga <ALSI@...g-olufsen.dk>, kernel-team@...roid.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH v1 1/2] driver core: fw_devlink: Add support for
 FWNODE_FLAG_BROKEN_PARENT

>   How would this be avoided? Or are you thinking of some kind of two-level
>   component driver system:
>   - the DSA switch is a component master, with components being its
>     sub-devices such as internal PHYs etc
>   - the DSA switch is also a component of the DSA switch tree

I think you might be missing a level. Think about the automotive
reference design system you posted the DT for a couple of days
ago. Don't you have cascaded switches, which are not members of the
same DSA tree. You might need a component for that whole group of
switches, above what you suggest here.

Can you nest components? How deep can you nest them?

    Andrew