linux-kernel - Re: [PATCH net-next v1 4/7] net: pse-pd: add generic PSE driver

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Date:   Fri, 19 Aug 2022 23:32:00 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Oleksij Rempel <o.rempel@...gutronix.de>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Corbet <corbet@....net>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
        David Jander <david@...tonic.nl>
Subject: Re: [PATCH net-next v1 4/7] net: pse-pd: add generic PSE driver

On Fri, Aug 19, 2022 at 02:01:06PM +0200, Oleksij Rempel wrote:
> Add generic driver to support simple Power Sourcing Equipment without
> automatic classification support.
> 
> This driver was tested on 10Bast-T1L switch with regulator based PoDL PSE.

Do you have access to a PHY which implements clause 45.2.9? That seems
like a better reference implementation?

I don't know the market, what is more likely, a simple regulator, or
something more capable with an interface like 45.2.9?

netlink does allow us to keep adding more attributes, so we don't need
to be perfect first time, but it seems like 45.2.9 is what IEEE expect
vendors to provide, so at some point Linux should implement it.

	  Andrew