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 <narmstr...@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;
--
2.25.1
