[net-next PATCH v3 4/5] net: phy: Introduce fwnode_get_phy_id()

[Calvin Johnson]

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@xxxxxxxxxxx>
---

Changes in v3: None
Changes in v2: None

 drivers/net/phy/phy_device.c | 21 +++++++++++++++++++++
 include/linux/phy.h          |  5 +++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 4204d49586cd..f4ad47f73f8d 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -662,6 +662,27 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
 }
 EXPORT_SYMBOL(phy_device_create);
 
+/* 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)
+{
+	const char *cp;
+	unsigned int upper, lower;
+	int ret;
+
+	ret = fwnode_property_read_string(fwnode, "compatible", &cp);
+	if (!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);
+
 /* get_phy_c45_devs_in_pkg - reads a MMD's devices in package registers.
  * @bus: the target MII bus
  * @addr: PHY address on the MII bus
diff --git a/include/linux/phy.h b/include/linux/phy.h
index f2664730a331..d78ae56509e1 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -1141,6 +1141,7 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, u32 phy_id,
 				     bool is_c45,
 				     struct phy_c45_device_ids *c45_ids);
 #if IS_ENABLED(CONFIG_PHYLIB)
+int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id);
 struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode);
 struct phy_device *device_phy_find_device(struct device *dev);
 struct fwnode_handle *fwnode_get_phy_node(struct fwnode_handle *fwnode);
@@ -1148,6 +1149,10 @@ struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45);
 int phy_device_register(struct phy_device *phy);
 void phy_device_free(struct phy_device *phydev);
 #else
+static inline int fwnode_get_phy_id(struct fwnode_handle *fwnode, u32 *phy_id)
+{
+	return 0;
+}
 static inline
 struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode)
 {
-- 
2.17.1