This patch introduces fwnode helper for registering MDIO
bus, as well as one for finding the PHY, basing on its
firmware node pointer. Comparing to existing OF equivalent,
fwnode_mdiobus_register() does not support:
* deprecated bindings (device whitelist, nor the PHY ID embedded
in the compatible string)
* MDIO bus auto scanning
Signed-off-by: Marcin Wojtas <m...@semihalf.com>
---
drivers/net/phy/mdio_bus.c | 218 ++++++++++++++++++++
include/linux/mdio.h | 3 +
2 files changed, 221 insertions(+)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index a0f34c3..f2b2a94 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -27,6 +27,7 @@
#include <linux/of_device.h>
#include <linux/of_mdio.h>
#include <linux/of_gpio.h>
+#include <linux/of_irq.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
@@ -662,6 +663,223 @@ static int mdio_uevent(struct device *dev, struct
kobj_uevent_env *env)
return 0;
}
+static int fwnode_mdiobus_register_phy(struct mii_bus *bus,
+ struct fwnode_handle *child, u32 addr)
+{
+ struct phy_device *phy;
+ bool is_c45 = false;
+ int rc;
+
+ rc = fwnode_property_match_string(child, "compatible",
+ "ethernet-phy-ieee802.3-c45");
+ if (!rc)
+ is_c45 = true;
+
+ phy = get_phy_device(bus, addr, is_c45);
+ if (IS_ERR(phy))
+ return PTR_ERR(phy);
+
+ phy->irq = bus->irq[addr];
+
+ if (to_of_node(child)) {
+ rc = of_irq_get(to_of_node(child), 0);
+ if (rc == -EPROBE_DEFER) {
+ phy_device_free(phy);
+ return rc;
+ } else if (rc > 0) {
+ phy->irq = rc;
+ bus->irq[addr] = rc;
+ }
+ }
+
+ if (fwnode_property_read_bool(child, "broken-turn-around"))
+ bus->phy_ignore_ta_mask |= 1 << 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(child);
+ return rc;
+ }
+
+ dev_dbg(&bus->dev, "registered phy at address %i\n", addr);
+
+ return 0;
+}
+
+static int fwnode_mdiobus_register_device(struct mii_bus *bus,
+ struct fwnode_handle *child, u32 addr)
+{
+ struct mdio_device *mdiodev;
+ int rc;
+
+ mdiodev = mdio_device_create(bus, addr);
+ if (IS_ERR(mdiodev))
+ return PTR_ERR(mdiodev);
+
+ /* Associate the fwnode with the device structure so it
+ * can be looked up later.
+ */
+ mdiodev->dev.fwnode = child;
+
+ /* All data is now stored in the mdiodev struct; register it. */
+ rc = mdio_device_register(mdiodev);
+ if (rc) {
+ mdio_device_free(mdiodev);
+ fwnode_handle_put(child);
+ return rc;
+ }
+
+ dev_dbg(&bus->dev, "registered mdio device at address %i\n", addr);
+
+ return 0;
+}
+
+static int fwnode_mdio_parse_addr(struct device *dev,
+ const struct fwnode_handle *fwnode)
+{
+ u32 addr;
+ int ret;
+
+ ret = fwnode_property_read_u32(fwnode, "reg", &addr);
+ if (ret < 0) {
+ dev_err(dev, "PHY node has no 'reg' property\n");
+ return ret;
+ }
+
+ /* A PHY must have a reg property in the range [0-31] */
+ if (addr < 0 || addr >= PHY_MAX_ADDR) {
+ dev_err(dev, "PHY address %i is invalid\n", addr);
+ return -EINVAL;
+ }
+
+ return addr;
+}
+
+/**
+ * fwnode_mdiobus_child_is_phy - Return true if the child is a PHY node.
+ * It must either:
+ * o Compatible string of "ethernet-phy-ieee802.3-c45"
+ * o Compatible string of "ethernet-phy-ieee802.3-c22"
+ * Checking "compatible" property is done, in order to follow the DT binding.
+ */
+static bool fwnode_mdiobus_child_is_phy(struct fwnode_handle *child)
+{
+ int ret;
+
+ ret = fwnode_property_match_string(child, "compatible",
+ "ethernet-phy-ieee802.3-c45");
+ if (!ret)
+ return true;
+
+ ret = fwnode_property_match_string(child, "compatible",
+ "ethernet-phy-ieee802.3-c22");
+ if (!ret)
+ return true;
+
+ if (!fwnode_property_present(child, "compatible"))
+ return true;
+
+ return false;
+}
+
+/**
+ * fwnode_mdiobus_register - Register mii_bus and create PHYs from the fwnode
+ * @bus: pointer to mii_bus structure
+ * @fwnode: pointer to fwnode_handle of MDIO bus.
+ *
+ * This function registers the mii_bus structure and registers a phy_device
+ * for each child node of @fwnode.
+ */
+int fwnode_mdiobus_register(struct mii_bus *bus, struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *child;
+ int addr, rc;
+ int default_gpio_reset_delay_ms = 10;
+
+ /* Do not continue if the node is disabled */
+ if (!fwnode_device_is_available(fwnode))
+ return -ENODEV;
+
+ /* Mask out all PHYs from auto probing. Instead the PHYs listed in
+ * the firmware nodes are populated after the bus has been registered.
+ */
+ bus->phy_mask = ~0;
+
+ bus->dev.fwnode = fwnode;
+
+ /* Get bus level PHY reset GPIO details */
+ bus->reset_delay_us = default_gpio_reset_delay_ms;
+ fwnode_property_read_u32(fwnode, "reset-delay-us",
+ &bus->reset_delay_us);
+
+ /* Register the MDIO bus */
+ rc = mdiobus_register(bus);
+ if (rc)
+ return rc;
+
+ /* Loop over the child nodes and register a phy_device for each PHY */
+ fwnode_for_each_child_node(fwnode, child) {
+ addr = fwnode_mdio_parse_addr(&bus->dev, child);
+ if (addr < 0)
+ continue;
+
+ if (fwnode_mdiobus_child_is_phy(child))
+ rc = fwnode_mdiobus_register_phy(bus, child, addr);
+ else
+ rc = fwnode_mdiobus_register_device(bus, child, addr);
+ if (rc)
+ goto unregister;
+ }
+
+ return 0;
+
+unregister:
+ mdiobus_unregister(bus);
+
+ return rc;
+}
+EXPORT_SYMBOL(fwnode_mdiobus_register);
+
+/* Helper function for fwnode_phy_find_device */
+static int fwnode_phy_match(struct device *dev, void *phy_fwnode)
+{
+ return dev->fwnode == phy_fwnode;
+}
+
+/**
+ * fwnode_phy_find_device - find the phy_device associated to fwnode
+ * @phy_fwnode: Pointer to the PHY's fwnode
+ *
+ * If successful, returns a pointer to the phy_device with the embedded
+ * struct device refcount incremented by one, or NULL on failure.
+ */
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode)
+{
+ struct device *d;
+ struct mdio_device *mdiodev;
+
+ if (!phy_fwnode)
+ return NULL;
+
+ d = bus_find_device(&mdio_bus_type, NULL, phy_fwnode, fwnode_phy_match);
+ if (d) {
+ mdiodev = to_mdio_device(d);
+ if (mdiodev->flags & MDIO_DEVICE_FLAG_PHY)
+ return to_phy_device(d);
+ put_device(d);
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL(fwnode_phy_find_device);
+
#ifdef CONFIG_PM
static int mdio_bus_suspend(struct device *dev)
{
diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index e37c21d..286ec12 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -272,6 +272,9 @@ 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(struct mii_bus *bus, struct fwnode_handle *fwnode);
+struct phy_device *fwnode_phy_find_device(struct fwnode_handle *phy_fwnode);
+
/**
* mdio_module_driver() - Helper macro for registering mdio drivers
*
--
2.7.4
