From: Marcin Wojtas <mw@semihalf.com>
To: Andrew Lunn <andrew@lunn.ch>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
netdev <netdev@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Russell King - ARM Linux <linux@armlinux.org.uk>,
Grzegorz Jaszczyk <jaz@semihalf.com>,
Grzegorz Bernacki <gjb@semihalf.com>,
upstream@semihalf.com,
Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>,
Jon Nettleton <jon@solid-run.com>,
Tomasz Nowicki <tn@semihalf.com>,
rjw@rjwysocki.net, lenb@kernel.org
Subject: Re: [net-next: PATCH v2 2/7] net: mdiobus: Introduce fwnode_mdbiobus_register()
Date: Thu, 17 Jun 2021 01:50:55 +0200 [thread overview]
Message-ID: <CAPv3WKdOkxV695DbhhYr+wf1rnphtj-pyERZ-74RrdZyQJGt=g@mail.gmail.com> (raw)
In-Reply-To: <YMpR+lJqcgQU2DMO@lunn.ch>
śr., 16 cze 2021 o 21:33 Andrew Lunn <andrew@lunn.ch> napisał(a):
>
> On Wed, Jun 16, 2021 at 09:07:54PM +0200, Marcin Wojtas wrote:
> > This patch introduces a new helper function that
> > wraps acpi_/of_ mdiobus_register() and allows its
> > usage via common fwnode_ interface.
> >
> > Fall back to raw mdiobus_register() in case CONFIG_FWNODE_MDIO
> > is not enabled, in order to satisfy compatibility
> > in all future user drivers.
>
> > Signed-off-by: Marcin Wojtas <mw@semihalf.com>
> > ---
> > include/linux/fwnode_mdio.h | 12 +++++++++++
> > drivers/net/mdio/fwnode_mdio.c | 22 ++++++++++++++++++++
> > 2 files changed, 34 insertions(+)
> >
> > diff --git a/include/linux/fwnode_mdio.h b/include/linux/fwnode_mdio.h
> > index faf603c48c86..13d4ae8fee0a 100644
> > --- a/include/linux/fwnode_mdio.h
> > +++ b/include/linux/fwnode_mdio.h
> > @@ -16,6 +16,7 @@ int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
> > int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> > struct fwnode_handle *child, u32 addr);
> >
> > +int fwnode_mdiobus_register(struct mii_bus *bus, struct fwnode_handle *fwnode);
> > #else /* CONFIG_FWNODE_MDIO */
> > int fwnode_mdiobus_phy_device_register(struct mii_bus *mdio,
> > struct phy_device *phy,
> > @@ -30,6 +31,17 @@ static inline int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> > {
> > return -EINVAL;
> > }
> > +
> > +static inline int fwnode_mdiobus_register(struct mii_bus *bus,
> > + struct fwnode_handle *fwnode)
> > +{
> > + /*
> > + * Fall back to mdiobus_register() function to register a bus.
> > + * This way, we don't have to keep compat bits around in drivers.
> > + */
> > +
> > + return mdiobus_register(mdio);
> > +}
>
> I'm not sure this fallback is correct.
>
> Any driver which decides to use fwmode is going to select it. If it is
> not selected, you want a link time error, or a compiler time error to
> tell you, you are missing FWNODE_MDIO. Calling mdiobus_register() is
> unlikely to work, or the driver would of done that directly.
>
This kind of fallback is done in of_mdiobus_register and acpi_mdiobus_register.
Actually mvmdio driver is using this fallback for non-dt platforms
(e.g. Orion). Therefore I would prefer to keep the current behavior.
Best regards,
Marcin
next prev parent reply other threads:[~2021-06-16 23:51 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-16 19:07 [net-next: PATCH v2 0/7] ACPI MDIO support for Marvell controllers Marcin Wojtas
2021-06-16 19:07 ` [net-next: PATCH v2 1/7] Documentation: ACPI: DSD: describe additional MAC configuration Marcin Wojtas
2021-06-16 19:07 ` [net-next: PATCH v2 2/7] net: mdiobus: Introduce fwnode_mdbiobus_register() Marcin Wojtas
2021-06-16 19:33 ` Andrew Lunn
2021-06-16 23:50 ` Marcin Wojtas [this message]
2021-06-17 12:59 ` Andrew Lunn
2021-06-16 19:07 ` [net-next: PATCH v2 3/7] net/fsl: switch to fwnode_mdiobus_register Marcin Wojtas
2021-06-16 19:35 ` Andrew Lunn
2021-06-16 23:39 ` Marcin Wojtas
2021-06-17 12:27 ` Andrew Lunn
2021-06-17 13:22 ` Marcin Wojtas
2021-06-16 19:07 ` [net-next: PATCH v2 4/7] net: mvmdio: simplify clock handling Marcin Wojtas
2021-06-16 19:48 ` Andrew Lunn
2021-06-16 23:25 ` Marcin Wojtas
2021-06-17 7:28 ` Andy Shevchenko
2021-06-16 19:07 ` [net-next: PATCH v2 5/7] net: mvmdio: add ACPI support Marcin Wojtas
2021-06-16 19:51 ` Andrew Lunn
2021-06-16 22:37 ` Marcin Wojtas
2021-06-16 23:01 ` Andrew Lunn
2021-06-16 19:07 ` [net-next: PATCH v2 6/7] net: mvpp2: enable using phylink with ACPI Marcin Wojtas
2021-06-16 19:07 ` [net-next: PATCH v2 7/7] net: mvpp2: remove unused 'has_phy' field Marcin Wojtas
2021-06-16 19:54 ` Andrew Lunn
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