Add support for DM_MDIO to connect to PHY and expose a MDIO device for the internal MDIO bus in order to dynamically connect to MDIO PHYs with DT with eventual MDIO muxes in between.
Signed-off-by: Neil Armstrong narmstrong@baylibre.com --- drivers/net/designware.c | 93 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 92 insertions(+), 1 deletion(-)
diff --git a/drivers/net/designware.c b/drivers/net/designware.c index 9dba55adaa..acf3a82828 100644 --- a/drivers/net/designware.c +++ b/drivers/net/designware.c @@ -21,7 +21,9 @@ #include <reset.h> #include <asm/cache.h> #include <dm/device_compat.h> +#include <dm/device-internal.h> #include <dm/devres.h> +#include <dm/lists.h> #include <linux/compiler.h> #include <linux/delay.h> #include <linux/err.h> @@ -122,6 +124,55 @@ static int dw_mdio_reset(struct mii_dev *bus) } #endif
+#if IS_ENABLED(CONFIG_DM_MDIO) +int designware_eth_mdio_read(struct udevice *mdio_dev, int addr, int devad, int reg) +{ + struct mdio_perdev_priv *pdata = dev_get_uclass_priv(mdio_dev); + + return dw_mdio_read(pdata->mii_bus, addr, devad, reg); +} + +int designware_eth_mdio_write(struct udevice *mdio_dev, int addr, int devad, int reg, u16 val) +{ + struct mdio_perdev_priv *pdata = dev_get_uclass_priv(mdio_dev); + + return dw_mdio_write(pdata->mii_bus, addr, devad, reg, val); +} + +#if CONFIG_IS_ENABLED(DM_GPIO) +int designware_eth_mdio_reset(struct udevice *mdio_dev) +{ + struct mdio_perdev_priv *pdata = dev_get_uclass_priv(mdio_dev); + + return dw_mdio_reset(pdata->mii_bus); +} +#endif + +static const struct mdio_ops designware_eth_mdio_ops = { + .read = designware_eth_mdio_read, + .write = designware_eth_mdio_write, +#if CONFIG_IS_ENABLED(DM_GPIO) + .reset = designware_eth_mdio_reset, +#endif +}; + +static int designware_eth_mdio_probe(struct udevice *dev) +{ + /* Use the priv data of parent */ + dev_set_priv(dev, dev_get_priv(dev->parent)); + + return 0; +} + +U_BOOT_DRIVER(designware_eth_mdio) = { + .name = "eth_designware_mdio", + .id = UCLASS_MDIO, + .probe = designware_eth_mdio_probe, + .ops = &designware_eth_mdio_ops, + .plat_auto = sizeof(struct mdio_perdev_priv), +}; +#endif + static int dw_mdio_init(const char *name, void *priv) { struct mii_dev *bus = mdio_alloc(); @@ -143,6 +194,34 @@ static int dw_mdio_init(const char *name, void *priv) return mdio_register(bus); }
+#if IS_ENABLED(CONFIG_DM_MDIO) +static int dw_dm_mdio_init(const char *name, void *priv) +{ + struct udevice *dev = priv; + ofnode node; + int ret; + + ofnode_for_each_subnode(node, dev_ofnode(dev)) { + const char *subnode_name = ofnode_get_name(node); + struct udevice *mdiodev; + + if (strcmp(subnode_name, "mdio")) + continue; + + ret = device_bind_driver_to_node(dev, "eth_designware_mdio", + subnode_name, node, &mdiodev); + if (ret) + debug("%s: not able to bind mdio device node\n", __func__); + + return 0; + } + + printf("%s: mdio node is missing, registering legacy mdio bus", __func__); + + return dw_mdio_init(name, priv); +} +#endif + static void tx_descs_init(struct dw_eth_dev *priv) { struct eth_dma_regs *dma_p = priv->dma_regs_p; @@ -487,7 +566,14 @@ static int _dw_free_pkt(struct dw_eth_dev *priv) static int dw_phy_init(struct dw_eth_dev *priv, void *dev) { struct phy_device *phydev; - int phy_addr = -1, ret; + int ret; + +#if IS_ENABLED(CONFIG_DM_MDIO) && IS_ENABLED(CONFIG_DM_ETH) + phydev = dm_eth_phy_connect(dev); + if (!phydev) + return -ENODEV; +#else + int phy_addr = -1;
#ifdef CONFIG_PHY_ADDR phy_addr = CONFIG_PHY_ADDR; @@ -496,6 +582,7 @@ static int dw_phy_init(struct dw_eth_dev *priv, void *dev) phydev = phy_connect(priv->bus, phy_addr, dev, priv->interface); if (!phydev) return -ENODEV; +#endif
phydev->supported &= PHY_GBIT_FEATURES; if (priv->max_speed) { @@ -759,7 +846,11 @@ int designware_eth_probe(struct udevice *dev) priv->interface = pdata->phy_interface; priv->max_speed = pdata->max_speed;
+#if IS_ENABLED(CONFIG_DM_MDIO) + ret = dw_dm_mdio_init(dev->name, dev); +#else ret = dw_mdio_init(dev->name, dev); +#endif if (ret) { err = ret; goto mdio_err;