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Message-ID: <CAHp75VfKoNvBxbj5tKb9NqGGbn36s=uZznm9QDBzkVWYNa=LCA@mail.gmail.com>
Date: Thu, 11 Mar 2021 14:09:37 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Calvin Johnson <calvin.johnson@....nxp.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 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.
> 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)
> + 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?
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
>
--
With Best Regards,
Andy Shevchenko
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