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Message-ID: <20210311180010.GC5031@lsv03152.swis.in-blr01.nxp.com>
Date: Thu, 11 Mar 2021 23:30:10 +0530
From: Calvin Johnson <calvin.johnson@....nxp.com>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Grant Likely <grant.likely@....com>,
"Rafael J . Wysocki" <rafael@...nel.org>,
Jeremy Linton <jeremy.linton@....com>,
Andrew Lunn <andrew@...n.ch>,
Florian Fainelli <f.fainelli@...il.com>,
Russell King - ARM Linux admin <linux@...linux.org.uk>,
Cristi Sovaiala <cristian.sovaiala@....com>,
Florin Laurentiu Chiculita <florinlaurentiu.chiculita@....com>,
Ioana Ciornei <ioana.ciornei@....com>,
Madalin Bucur <madalin.bucur@....nxp.com>,
Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
Marcin Wojtas <mw@...ihalf.com>,
Pieter Jansen Van Vuuren <pieter.jansenvv@...boosystems.io>,
Jon <jon@...id-run.com>, Saravana Kannan <saravanak@...gle.com>,
Randy Dunlap <rdunlap@...radead.org>,
linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
Diana Madalina Craciun <diana.craciun@....com>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
"linux.cj" <linux.cj@...il.com>, netdev <netdev@...r.kernel.org>,
Laurentiu Tudor <laurentiu.tudor@....com>,
"David S. Miller" <davem@...emloft.net>,
Frank Rowand <frowand.list@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>,
Jakub Kicinski <kuba@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
devicetree <devicetree@...r.kernel.org>
Subject: Re: [net-next PATCH v7 08/16] net: mdiobus: Introduce
fwnode_mdiobus_register_phy()
On Thu, Mar 11, 2021 at 02:09:37PM +0200, Andy Shevchenko wrote:
> On Thu, Mar 11, 2021 at 8:21 AM Calvin Johnson
> <calvin.johnson@....nxp.com> wrote:
> >
> > Introduce fwnode_mdiobus_register_phy() to register PHYs on the
> > mdiobus. From the compatible string, identify whether the PHY is
> > c45 and based on this create a PHY device instance which is
> > registered on the mdiobus.
>
> > uninitialized symbol 'mii_ts'
> > Reported-by: kernel test robot <lkp@...el.com>
> > Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
>
> I don't think it's important to have it in a history of Git. I would
> move this after the cutter '---' line below.
Sorry. I thought I had removed it. Will definitely take care next time.
>
> > Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
> > ---
> >
> > Changes in v7:
> > - Call unregister_mii_timestamper() without NULL check
> > - Create fwnode_mdio.c and move fwnode_mdiobus_register_phy()
> >
> > Changes in v6:
> > - Initialize mii_ts to NULL
> >
> > Changes in v5: None
> > Changes in v4: None
> > Changes in v3: None
> > Changes in v2: None
> >
> > MAINTAINERS | 1 +
> > drivers/net/mdio/Kconfig | 9 ++++
> > drivers/net/mdio/Makefile | 3 +-
> > drivers/net/mdio/fwnode_mdio.c | 77 ++++++++++++++++++++++++++++++++++
> > drivers/net/mdio/of_mdio.c | 3 +-
> > include/linux/fwnode_mdio.h | 24 +++++++++++
> > include/linux/of_mdio.h | 6 ++-
> > 7 files changed, 120 insertions(+), 3 deletions(-)
> > create mode 100644 drivers/net/mdio/fwnode_mdio.c
> > create mode 100644 include/linux/fwnode_mdio.h
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index e1fa5ad9bb30..146de41d2656 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -6680,6 +6680,7 @@ F: Documentation/devicetree/bindings/net/mdio*
> > F: Documentation/devicetree/bindings/net/qca,ar803x.yaml
> > F: Documentation/networking/phy.rst
> > F: drivers/net/mdio/
> > +F: drivers/net/mdio/fwnode_mdio.c
> > F: drivers/net/mdio/of_mdio.c
> > F: drivers/net/pcs/
> > F: drivers/net/phy/
> > diff --git a/drivers/net/mdio/Kconfig b/drivers/net/mdio/Kconfig
> > index a10cc460d7cf..2d5bf5ccffb5 100644
> > --- a/drivers/net/mdio/Kconfig
> > +++ b/drivers/net/mdio/Kconfig
> > @@ -19,6 +19,15 @@ config MDIO_BUS
> > reflects whether the mdio_bus/mdio_device code is built as a
> > loadable module or built-in.
> >
> > +config FWNODE_MDIO
> > + def_tristate PHYLIB
>
> (Seems "selectable only" item)
What do you mean by "selectable only" item here? Can you please point to some
other example?
>
> > + depends on ACPI
> > + depends on OF
>
> Wouldn't be better to have
> depends on (ACPI || OF) || COMPILE_TEST
>
> And honestly I don't understand it in either (AND or OR) variant. Why
> do you need a dependency like this for fwnode API?
Here, fwnode_mdiobus_register_phy() uses objects from both ACPI and OF.
>
> Moreover dependencies don't work for "selectable only" items.
>
> > + depends on PHYLIB
> > + select FIXED_PHY
> > + help
> > + FWNODE MDIO bus (Ethernet PHY) accessors
> > +
> > config OF_MDIO
> > def_tristate PHYLIB
> > depends on OF
> > diff --git a/drivers/net/mdio/Makefile b/drivers/net/mdio/Makefile
> > index 5c498dde463f..ea5390e2ef84 100644
> > --- a/drivers/net/mdio/Makefile
> > +++ b/drivers/net/mdio/Makefile
> > @@ -1,7 +1,8 @@
> > # SPDX-License-Identifier: GPL-2.0
> > # Makefile for Linux MDIO bus drivers
> >
> > -obj-$(CONFIG_OF_MDIO) += of_mdio.o
> > +obj-$(CONFIG_FWNODE_MDIO) += fwnode_mdio.o
> > +obj-$(CONFIG_OF_MDIO) += of_mdio.o
> >
> > obj-$(CONFIG_MDIO_ASPEED) += mdio-aspeed.o
> > obj-$(CONFIG_MDIO_BCM_IPROC) += mdio-bcm-iproc.o
> > diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
> > new file mode 100644
> > index 000000000000..0982e816a6fb
> > --- /dev/null
> > +++ b/drivers/net/mdio/fwnode_mdio.c
> > @@ -0,0 +1,77 @@
> > +// SPDX-License-Identifier: GPL-2.0-only
> > +/*
> > + * fwnode helpers for the MDIO (Ethernet PHY) API
> > + *
> > + * This file provides helper functions for extracting PHY device information
> > + * out of the fwnode and using it to populate an mii_bus.
> > + */
> > +
> > +#include <linux/acpi.h>
> > +#include <linux/of.h>
> > +#include <linux/of_mdio.h>
> > +#include <linux/phy.h>
> > +
> > +MODULE_AUTHOR("Calvin Johnson <calvin.johnson@....nxp.com>");
> > +MODULE_LICENSE("GPL");
> > +
> > +int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> > + struct fwnode_handle *child, u32 addr)
> > +{
> > + struct mii_timestamper *mii_ts = NULL;
> > + struct phy_device *phy;
> > + bool is_c45 = false;
> > + u32 phy_id;
> > + int rc;
> > +
> > + if (is_of_node(child)) {
> > + mii_ts = of_find_mii_timestamper(to_of_node(child));
> > + if (IS_ERR(mii_ts))
> > + return PTR_ERR(mii_ts);
> > + }
> > +
> > + rc = fwnode_property_match_string(child, "compatible", "ethernet-phy-ieee802.3-c45");
> > + if (rc >= 0)
> > + is_c45 = true;
> > +
> > + if (is_c45 || fwnode_get_phy_id(child, &phy_id))
> > + phy = get_phy_device(bus, addr, is_c45);
> > + else
> > + phy = phy_device_create(bus, addr, phy_id, 0, NULL);
> > + if (IS_ERR(phy)) {
> > + unregister_mii_timestamper(mii_ts);
> > + return PTR_ERR(phy);
> > + }
> > +
> > + if (is_acpi_node(child)) {
> > + phy->irq = bus->irq[addr];
> > +
> > + /* Associate the fwnode with the device structure so it
> > + * can be looked up later.
> > + */
> > + phy->mdio.dev.fwnode = child;
> > +
> > + /* All data is now stored in the phy struct, so register it */
> > + rc = phy_device_register(phy);
> > + if (rc) {
> > + phy_device_free(phy);
> > + fwnode_handle_put(phy->mdio.dev.fwnode);
> > + return rc;
> > + }
> > + } else if (is_of_node(child)) {
> > + rc = of_mdiobus_phy_device_register(bus, phy, to_of_node(child), addr);
> > + if (rc) {
> > + unregister_mii_timestamper(mii_ts);
> > + phy_device_free(phy);
> > + return rc;
> > + }
> > + }
> > +
> > + /* phy->mii_ts may already be defined by the PHY driver. A
> > + * mii_timestamper probed via the device tree will still have
> > + * precedence.
> > + */
> > + if (mii_ts)
> > + phy->mii_ts = mii_ts;
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(fwnode_mdiobus_register_phy);
> > diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
> > index 48b6b8458c17..db293e0b8249 100644
> > --- a/drivers/net/mdio/of_mdio.c
> > +++ b/drivers/net/mdio/of_mdio.c
> > @@ -32,7 +32,7 @@ static int of_get_phy_id(struct device_node *device, u32 *phy_id)
> > return fwnode_get_phy_id(of_fwnode_handle(device), phy_id);
> > }
> >
> > -static struct mii_timestamper *of_find_mii_timestamper(struct device_node *node)
> > +struct mii_timestamper *of_find_mii_timestamper(struct device_node *node)
> > {
> > struct of_phandle_args arg;
> > int err;
> > @@ -49,6 +49,7 @@ static struct mii_timestamper *of_find_mii_timestamper(struct device_node *node)
> >
> > return register_mii_timestamper(arg.np, arg.args[0]);
> > }
> > +EXPORT_SYMBOL(of_find_mii_timestamper);
> >
> > int of_mdiobus_phy_device_register(struct mii_bus *mdio, struct phy_device *phy,
> > struct device_node *child, u32 addr)
> > diff --git a/include/linux/fwnode_mdio.h b/include/linux/fwnode_mdio.h
> > new file mode 100644
> > index 000000000000..8c0392845916
> > --- /dev/null
> > +++ b/include/linux/fwnode_mdio.h
> > @@ -0,0 +1,24 @@
> > +/* SPDX-License-Identifier: GPL-2.0-only */
> > +/*
> > + * FWNODE helper for the MDIO (Ethernet PHY) API
> > + */
> > +
> > +#ifndef __LINUX_FWNODE_MDIO_H
> > +#define __LINUX_FWNODE_MDIO_H
> > +
> > +#include <linux/phy.h>
> > +
> > +#if IS_ENABLED(CONFIG_FWNODE_MDIO)
> > +int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> > + struct fwnode_handle *child, u32 addr);
> > +
> > +#else /* CONFIG_FWNODE_MDIO */
> > +static inline int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> > + struct fwnode_handle *child,
> > + u32 addr)
> > +{
> > + return -EINVAL;
> > +}
> > +#endif
> > +
> > +#endif /* __LINUX_FWNODE_MDIO_H */
> > diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
> > index 2b05e7f7c238..e4ee6c4d9431 100644
> > --- a/include/linux/of_mdio.h
> > +++ b/include/linux/of_mdio.h
> > @@ -31,6 +31,7 @@ struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np);
> > int of_phy_register_fixed_link(struct device_node *np);
> > void of_phy_deregister_fixed_link(struct device_node *np);
> > bool of_phy_is_fixed_link(struct device_node *np);
> > +struct mii_timestamper *of_find_mii_timestamper(struct device_node *np);
> > int of_mdiobus_phy_device_register(struct mii_bus *mdio, struct phy_device *phy,
> > struct device_node *child, u32 addr);
> >
> > @@ -118,7 +119,10 @@ static inline bool of_phy_is_fixed_link(struct device_node *np)
> > {
> > return false;
> > }
> > -
> > +static inline struct mii_timestamper *of_find_mii_timestamper(struct device_node *np)
> > +{
> > + return NULL;
> > +}
> > static inline int of_mdiobus_phy_device_register(struct mii_bus *mdio,
> > struct phy_device *phy,
> > struct device_node *child, u32 addr)
> > --
> > 2.17.1
> >
>
>
Regards
Calvin
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