diff mbox series

[net-next,v7,08/16] net: mdiobus: Introduce fwnode_mdiobus_register_phy()

Message ID 20210311062011.8054-9-calvin.johnson@oss.nxp.com (mailing list archive)
State New
Headers show
Series ACPI support for dpaa2 driver | expand

Commit Message

Calvin Johnson March 11, 2021, 6:20 a.m. UTC
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@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

Signed-off-by: Calvin Johnson <calvin.johnson@oss.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

Comments

Andy Shevchenko March 11, 2021, 12:09 p.m. UTC | #1
On Thu, Mar 11, 2021 at 8:21 AM Calvin Johnson
<calvin.johnson@oss.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@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.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@oss.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@oss.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
>
Calvin Johnson March 11, 2021, 6 p.m. UTC | #2
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@oss.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@intel.com>
> > Reported-by: Dan Carpenter <dan.carpenter@oracle.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@oss.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@oss.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
Andy Shevchenko March 11, 2021, 6:14 p.m. UTC | #3
On Thu, Mar 11, 2021 at 8:00 PM Calvin Johnson
<calvin.johnson@oss.nxp.com> wrote:
> 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@oss.nxp.com> wrote:

...

> > > +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?

The Kconfig sections without descriptions are not user-visible.
No user can run menuconfig and check a box with "I want this to be compiled".

tristate // selectable-only
tristate "bla bla bla" // user visible and selectable

> > > +       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.

APIs? Calls? What really fails if we have !ACPI and / or !OF?

> > Moreover dependencies don't work for "selectable only" items.
> >
> > > +       depends on PHYLIB
> > > +       select FIXED_PHY

--
With Best Regards,
Andy Shevchenko
diff mbox series

Patch

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
+	depends on ACPI
+	depends on OF
+	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@oss.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)