linux-kernel - Re: [PATCH v3 net-next 12/14] dt-bindings: net: dsa: ocelot: add ocelot-ext documentation

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Date:   Fri, 7 Oct 2022 13:44:10 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>,
        UNGLinuxDriver@...rochip.com,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Lee Jones <lee@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH v3 net-next 12/14] dt-bindings: net: dsa: ocelot: add
 ocelot-ext documentation

On Tue, Sep 27, 2022 at 11:26:00PM +0300, Vladimir Oltean wrote:
> On Sun, Sep 25, 2022 at 05:29:26PM -0700, Colin Foster wrote:
> > +
> > +    The Ocelot family consists of four devices, the VSC7511, VSC7512, VSC7513,
> > +    and the VSC7514. The VSC7513 and VSC7514 both have an internal MIPS
> > +    processor that natively support Linux. Additionally, all four devices
> > +    support control over external interfaces, SPI and PCIe. The Ocelot-Ext
> > +    driver is for the external control portion.
> > +
> > +    The following PHY interface types are supported:
> > +
> > +      - phy-mode = "internal": on ports 0, 1, 2, 3
> 
> More PHY interface types are supported. Please document them all.
> It doesn't matter what the driver supports. Drivers and device tree
> blobs should be able to have different lifetimes. A driver which doesn't
> support the SERDES ports should work with a device tree that defines
> them, and a driver that supports the SERDES ports should work with a
> device tree that doesn't.
> 
> Similar for the other stuff which isn't documented (interrupts, SERDES
> PHY handles etc). Since there is already an example with vsc7514, you
> know how they need to look, even if they don't work yet on your
> hardware, no?
> 

With regards to the interrupts - I don't really have a concept of how
those will work, since there isn't a processor for those lines to
interrupt. So while there is this for the 7514:

interrupts = <18 21 16>;
interrupt-names = "ptp_rdy", "xtr", "fdma";

it seems like there isn't anything to add there.

That is, unless there's something deeper that is going on that I don't
fully understand yet. It wouldn't be the first time and, realistically,
won't be the last. I'll copy the 7514 for now, as I plan to send out an
RFC shortly with all these updates.