netdev - Re: [net-next 1/5] net: mdio: fwnode: add fwnode_mdiobus

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Message-ID: <20220328082642.471281e7@fixe.home>
Date:   Mon, 28 Mar 2022 08:26:42 +0200
From:   Clément Léger <clement.leger@...tlin.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Allan Nielsen <allan.nielsen@...rochip.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next 1/5] net: mdio: fwnode: add fwnode_mdiobus_register()

Le Fri, 25 Mar 2022 19:38:24 +0100,
Andrew Lunn <andrew@...n.ch> a écrit :

> On Fri, Mar 25, 2022 at 06:22:30PM +0100, Clément Léger wrote:
> > In order to support software node description transparently, add fwnode
> > support with fwnode_mdiobus_register(). This function behaves exactly
> > like of_mdiobus_register() function but using the fwnode node agnostic
> > API. This support might also be used to merge ACPI mdiobus support
> > which is quite similar to the fwnode one.
> > 
> > Some part such as the whitelist matching are kept exclusively for OF
> > nodes since it uses an of_device_id struct and seems tightly coupled
> > with OF. Other parts are generic and will allow to move the existing
> > OF support on top of this fwnode version.  
> 
> Does fwnode have any documentation? How does a developer know what
> properties can be passed? Should you be adding a
> 
> Documentation/fwnode/bindings/net/mdio.yaml ?
> 
> 	Andrew

Hi Andrew,

Actually, fwnode is an abstraction for various firmware nodes such as
ACPI, device-tree and software nodes. It allows to access properties,
child and other attributes transparently from these various nodes but
does not actually defines how they should describe the hardware. If
there is specific hanling to be done, node type can be checked using
is_acpi_node(), is_of_node() and so on.

I think it is still needed to document the bindings for each node type.

-- 
Clément Léger,
Embedded Linux and Kernel engineer at Bootlin
https://bootlin.com