Add support for DM_MDIO by registering a UCLASS_MDIO driver and attempting to use it. This is necessary if wanting to use a DSA driver for example hanging off of the FEC MAC.
Care is taken to fallback to non DM_MDIO mii bus as several boards define DM_MDIO without having the proper device-tree configuration necessary such as an mdio subnode, a phy-mode prop, and either a valid phy-handle prop or fixed-phy subnode which will cause dm_eth_phy_connect() to fail.
Signed-off-by: Tim Harvey tharvey@gateworks.com --- v4: - no changes v3: - no changes v2: - fix fallback mechanism for legacy dt's that do not have phy-handle and mdio subnode --- drivers/net/fec_mxc.c | 90 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 88 insertions(+), 2 deletions(-)
diff --git a/drivers/net/fec_mxc.c b/drivers/net/fec_mxc.c index 8bc2b46d403f..03be4b4ec282 100644 --- a/drivers/net/fec_mxc.c +++ b/drivers/net/fec_mxc.c @@ -30,6 +30,8 @@ #include <asm/arch/imx-regs.h> #include <asm/mach-imx/sys_proto.h> #include <asm-generic/gpio.h> +#include <dm/device_compat.h> +#include <dm/lists.h>
#include "fec_mxc.h" #include <eth_phy.h> @@ -1026,6 +1028,81 @@ struct mii_dev *fec_get_miibus(ulong base_addr, int dev_id) return bus; }
+#ifdef CONFIG_DM_MDIO +struct dm_fec_mdio_priv { + struct ethernet_regs *regs; +}; + +static int dm_fec_mdio_read(struct udevice *dev, int addr, int devad, int reg) +{ + struct dm_fec_mdio_priv *priv = dev_get_priv(dev); + + return fec_mdio_read(priv->regs, addr, reg); +} + +static int dm_fec_mdio_write(struct udevice *dev, int addr, int devad, int reg, u16 data) +{ + struct dm_fec_mdio_priv *priv = dev_get_priv(dev); + + return fec_mdio_write(priv->regs, addr, reg, data); +} + +static const struct mdio_ops dm_fec_mdio_ops = { + .read = dm_fec_mdio_read, + .write = dm_fec_mdio_write, +}; + +static int dm_fec_mdio_probe(struct udevice *dev) +{ + struct dm_fec_mdio_priv *priv = dev_get_priv(dev); + + priv->regs = (struct ethernet_regs *)ofnode_get_addr(dev_ofnode(dev->parent)); + + return 0; +} + +U_BOOT_DRIVER(fec_mdio) = { + .name = "fec_mdio", + .id = UCLASS_MDIO, + .probe = dm_fec_mdio_probe, + .ops = &dm_fec_mdio_ops, + .priv_auto = sizeof(struct dm_fec_mdio_priv), +}; + +static int dm_fec_bind_mdio(struct udevice *dev) +{ + struct udevice *mdiodev; + const char *name; + ofnode mdio; + int ret = -ENODEV; + + /* for a UCLASS_MDIO driver we need to bind and probe manually + * for an internal MDIO bus that has no dt compatible of its own + */ + ofnode_for_each_subnode(mdio, dev_ofnode(dev)) { + name = ofnode_get_name(mdio); + + if (strcmp(name, "mdio")) + continue; + + ret = device_bind_driver_to_node(dev, "fec_mdio", + name, mdio, &mdiodev); + if (ret) { + printf("%s bind %s failed: %d\n", __func__, name, ret); + break; + } + + /* need to probe it as there is no compatible to do so */ + ret = uclass_get_device_by_ofnode(UCLASS_MDIO, mdio, &mdiodev); + if (!ret) + return 0; + printf("%s probe %s failed: %d\n", __func__, name, ret); + } + + return ret; +} +#endif + static int fecmxc_read_rom_hwaddr(struct udevice *dev) { struct fec_priv *priv = dev_get_priv(dev); @@ -1089,7 +1166,7 @@ static int device_get_phy_addr(struct fec_priv *priv, struct udevice *dev)
static int fec_phy_init(struct fec_priv *priv, struct udevice *dev) { - struct phy_device *phydev; + struct phy_device *phydev = NULL; int addr;
addr = device_get_phy_addr(priv, dev); @@ -1097,7 +1174,10 @@ static int fec_phy_init(struct fec_priv *priv, struct udevice *dev) addr = CONFIG_FEC_MXC_PHYADDR; #endif
- phydev = phy_connect(priv->bus, addr, dev, priv->interface); + if (IS_ENABLED(CONFIG_DM_MDIO)) + phydev = dm_eth_phy_connect(dev); + if (!phydev) + phydev = phy_connect(priv->bus, addr, dev, priv->interface); if (!phydev) return -ENODEV;
@@ -1228,6 +1308,12 @@ static int fecmxc_probe(struct udevice *dev)
priv->dev_id = dev_seq(dev);
+ if (IS_ENABLED(CONFIG_DM_MDIO)) { + ret = dm_fec_bind_mdio(dev); + if (ret && ret != -ENODEV) + return ret; + } + #ifdef CONFIG_DM_ETH_PHY bus = eth_phy_get_mdio_bus(dev); #endif