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SubjectRe: [net-next PATCH v4 07/15] net: mdiobus: Introduce fwnode_mdiobus_register_phy()
On Fri, Jan 22, 2021 at 09:12:52PM +0530, Calvin Johnson 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.
>
> Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
> ---
>
> Changes in v4: None
> Changes in v3: None
> Changes in v2: None
>
> drivers/net/mdio/of_mdio.c | 3 +-
> drivers/net/phy/mdio_bus.c | 67 ++++++++++++++++++++++++++++++++++++++
> include/linux/mdio.h | 2 ++
> include/linux/of_mdio.h | 6 +++-
> 4 files changed, 76 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/mdio/of_mdio.c b/drivers/net/mdio/of_mdio.c
> index d4cc293358f7..cd7da38ae763 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/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
> index 040509b81f02..44ddfb0ba99f 100644
> --- a/drivers/net/phy/mdio_bus.c
> +++ b/drivers/net/phy/mdio_bus.c
> @@ -8,6 +8,7 @@
>
> #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
>
> +#include <linux/acpi.h>
> #include <linux/delay.h>
> #include <linux/device.h>
> #include <linux/errno.h>
> @@ -106,6 +107,72 @@ int mdiobus_unregister_device(struct mdio_device *mdiodev)
> }
> EXPORT_SYMBOL(mdiobus_unregister_device);
>
> +int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> + struct fwnode_handle *child, u32 addr)
> +{
> + struct mii_timestamper *mii_ts;
> + 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");
With ACPI, I'm facing some problem with fwnode_property_match_string(). It is
unable to detect the compatible string and returns -EPROTO.

ACPI node for PHY4 is as below:

Device(PHY4) {
Name (_ADR, 0x4)
Name(_CRS, ResourceTemplate() {
Interrupt(ResourceConsumer, Level, ActiveHigh, Shared)
{
AQR_PHY4_IT
}
}) // end of _CRS for PHY4
Name (_DSD, Package () {
ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
Package () {
Package () {"compatible", "ethernet-phy-ieee802.3-c45"}
}
})
} // end of PHY4

What is see is that in acpi_data_get_property(),
propvalue->type = 0x2(ACPI_TYPE_STRING) and type = 0x4(ACPI_TYPE_PACKAGE).

Any help please?

fwnode_property_match_string() works fine for DT.

Thanks
Calvin

> + 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)) {
> + if (mii_ts && is_of_node(child))
> + 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;
> + }
> +
> + dev_dbg(&bus->dev, "registered phy at address %i\n", addr);
> + } else if (is_of_node(child)) {
> + rc = of_mdiobus_phy_device_register(bus, phy, to_of_node(child), addr);
> + if (rc) {
> + if (mii_ts)
> + 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);
> +
> struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr)
> {
> struct mdio_device *mdiodev = bus->mdio_map[addr];
> diff --git a/include/linux/mdio.h b/include/linux/mdio.h
> index ffb787d5ebde..7f4215c069fe 100644
> --- a/include/linux/mdio.h
> +++ b/include/linux/mdio.h
> @@ -381,6 +381,8 @@ int mdiobus_register_device(struct mdio_device *mdiodev);
> int mdiobus_unregister_device(struct mdio_device *mdiodev);
> bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
> struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);
> +int fwnode_mdiobus_register_phy(struct mii_bus *bus,
> + struct fwnode_handle *child, u32 addr);
>
> /**
> * mdio_module_driver() - Helper macro for registering mdio drivers
> diff --git a/include/linux/of_mdio.h b/include/linux/of_mdio.h
> index cfe8c607a628..3b66016f18aa 100644
> --- a/include/linux/of_mdio.h
> +++ b/include/linux/of_mdio.h
> @@ -34,6 +34,7 @@ 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);
>
> @@ -128,7 +129,10 @@ 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
>

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