The binding represents the MDIO controller as a child device tree node of the MAC device tree node.
The U-Boot driver mostly ignores that child device tree node and just hardcodes the resources it uses to support both the MAC and MDIO in a single driver. However, some resources like pinctrl muxing states are thus ignored. This has been a problem with device trees since Linux 6.5-rc1 which will put some pinctrl states on the MDIO device tree node. Let's rework the driver a bit to fetch the pinctrl state from the MDIO node and apply it. Signed-off-by: Maxime Ripard <[email protected]> --- drivers/net/ti/am65-cpsw-nuss.c | 49 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) diff --git a/drivers/net/ti/am65-cpsw-nuss.c b/drivers/net/ti/am65-cpsw-nuss.c index f674b0baa359..2d579bf4af2c 100644 --- a/drivers/net/ti/am65-cpsw-nuss.c +++ b/drivers/net/ti/am65-cpsw-nuss.c @@ -15,6 +15,7 @@ #include <dm.h> #include <dm/device_compat.h> #include <dm/lists.h> +#include <dm/pinctrl.h> #include <dma-uclass.h> #include <dm/of_access.h> #include <miiphy.h> @@ -696,6 +697,50 @@ out: return ret; } +static ofnode am65_cpsw_find_mdio(ofnode parent) +{ + ofnode node; + + ofnode_for_each_subnode(node, parent) + if (ofnode_device_is_compatible(node, "ti,cpsw-mdio")) + return node; + + return ofnode_null(); +} + +static int am65_cpsw_setup_mdio(struct udevice *dev) +{ + ofnode mdio; + int ret; + + mdio = am65_cpsw_find_mdio(dev_ofnode(dev)); + if (!ofnode_valid(mdio)) + return -ENODEV; + + /* + * The MDIO controller is represented in the DT binding by a + * subnode of the MAC controller. + * + * Our driver largely ignores that and supports MDIO by + * hardcoding the register offsets. + * + * However, some resources (clocks, pinctrl) might be tied to + * the MDIO node, and thus ignored. + * + * Clocks are not a concern at the moment since it's shared + * between the MAC and MDIO, so the driver handles both at the + * same time. + * + * However, we do need to make sure the pins states tied to the + * MDIO node are configured properly. + */ + ret = pinctrl_select_state_by_ofnode(dev, mdio, "default"); + if (ret) + return ret; + + return 0; +} + static int am65_cpsw_probe_nuss(struct udevice *dev) { struct am65_cpsw_common *cpsw_common = dev_get_priv(dev); @@ -728,6 +773,10 @@ static int am65_cpsw_probe_nuss(struct udevice *dev) AM65_CPSW_CPSW_NU_ALE_BASE; cpsw_common->mdio_base = cpsw_common->ss_base + AM65_CPSW_MDIO_BASE; + ret = am65_cpsw_setup_mdio(dev); + if (ret) + goto out; + ports_np = dev_read_subnode(dev, "ethernet-ports"); if (!ofnode_valid(ports_np)) { ret = -ENOENT; -- 2.41.0
