linux-kernel - Re: [RFC Patch net-next 0/4] net: dsa: microchip: ksz9477: enable interrupt for internal phy link detection

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Message-ID: <YyB1BjN+lFcZL1kW@lunn.ch>
Date:   Tue, 13 Sep 2022 14:18:14 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Arun.Ramadoss@...rochip.com
Cc:     olteanv@...il.com, linux-kernel@...r.kernel.org,
        UNGLinuxDriver@...rochip.com, vivien.didelot@...il.com,
        linux@...linux.org.uk, Tristram.Ha@...rochip.com,
        f.fainelli@...il.com, kuba@...nel.org, edumazet@...gle.com,
        pabeni@...hat.com, netdev@...r.kernel.org,
        Woojung.Huh@...rochip.com, davem@...emloft.net
Subject: Re: [RFC Patch net-next 0/4] net: dsa: microchip: ksz9477: enable
 interrupt for internal phy link detection

On Tue, Sep 13, 2022 at 04:21:47AM +0000, Arun.Ramadoss@...rochip.com wrote:
> Hi Andrew, 
> On Mon, 2022-09-12 at 23:33 +0200, Andrew Lunn wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you
> > know the content is safe
> > 
> > On Fri, Sep 09, 2022 at 09:31:16PM +0530, Arun Ramadoss wrote:
> > > This patch series implements the common interrupt handling for
> > > ksz9477 based
> > > switches and lan937x. The ksz9477 and lan937x has similar interrupt
> > > registers
> > > except ksz9477 has 4 port based interrupts whereas lan937x has 6
> > > interrupts.
> > > The patch moves the phy interrupt hanler implemented in
> > > lan937x_main.c to
> > > ksz_common.c, along with the mdio_register functionality.
> > 
> > It is a good idea to state why it is an RFC. What sort of comments do
> > you want?
> 
> In the arch/arm/boot/dts/at91-sama5d3_ksz9477_evb.dts file, they
> haven't specified the phy-handle. If I use that dts file with this
> patch, during the mdio_register I get the error *no mdio bus node* and
> the ksz probe fails. If I update the dts file with phy-handle  and mdio
> node, the mdio_register is successfull and interrupt handling works
> fine. Do I need to add any checks before mdio_register or updating the
> dts file is enough?

Drivers are supposed to remain backwards compatible to older DT blobs.
So you need to support the phy-handle not being present.

You can however still add it to at91-sama5d3_ksz9477_evb.dts, have the
yaml binding indicate it is a required property, and maybe in 2 years
change the driver to make it required.

    Andrew