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SubjectRe: [net-next PATCH v1 3/7] net: phy: Introduce fwnode_get_phy_id()
On Fri, Oct 02, 2020 at 12:05:14PM +0100, Grant Likely wrote:
>
>
> On 30/09/2020 17:04, Calvin Johnson wrote:
> > Extract phy_id from compatible string. This will be used by
> > fwnode_mdiobus_register_phy() to create phy device using the
> > phy_id.
> >
> > Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
> > ---
> >
> > drivers/net/phy/phy_device.c | 32 +++++++++++++++++++++++++++++++-
> > include/linux/phy.h | 5 +++++
> > 2 files changed, 36 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> > index c4aec56d0a95..162abde6223d 100644
> > --- a/drivers/net/phy/phy_device.c
> > +++ b/drivers/net/phy/phy_device.c
> > @@ -9,6 +9,7 @@
> > #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> > +#include <linux/acpi.h>
> > #include <linux/bitmap.h>
> > #include <linux/delay.h>
> > #include <linux/errno.h>
> > @@ -845,6 +846,27 @@ static int get_phy_c22_id(struct mii_bus *bus, int addr, u32 *phy_id)
> > return 0;
> > }
> > +/* Extract the phy ID from the compatible string of the form
> > + * ethernet-phy-idAAAA.BBBB.
> > + */
> > +int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id)
> > +{
> > + unsigned int upper, lower;
> > + const char *cp;
> > + int ret;
> > +
> > + ret = fwnode_property_read_string(fwnode, "compatible", &cp);
> > + if (ret)
> > + return ret;
> > +
> > + if (sscanf(cp, "ethernet-phy-id%4x.%4x", &upper, &lower) == 2) {
> > + *phy_id = ((upper & 0xFFFF) << 16) | (lower & 0xFFFF);
> > + return 0;
> > + }
> > + return -EINVAL;
> > +}
> > +EXPORT_SYMBOL(fwnode_get_phy_id);
>
> This block, and the changes in patch 4 duplicate functions from
> drivers/of/of_mdio.c, but it doesn't refactor anything in
> drivers/of/of_mdio.c to use the new path. Is your intent to bring all of the
> parsing in these functions of "compatible" into the ACPI code path?
>
> If so, then the existing code path needs to be refactored to work with
> fwnode_handle instead of device_node.
>
> If not, then the DT path in these functions should call out to of_mdio,
> while the ACPI path only does what is necessary.

I'll work on refactoring as Florian and Rob are also suggesting the same.

Thanks
Calvin

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