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SubjectRe: [net-next PATCH v5 15/15] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver
On Mon, Feb 08, 2021 at 08:42:44PM +0530, Calvin Johnson wrote:
> Modify dpaa2_mac_connect() to support ACPI along with DT.
> Modify dpaa2_mac_get_node() to get the dpmac fwnode from either
> DT or ACPI.
>
> Replace of_get_phy_mode with fwnode_get_phy_mode to get
> phy-mode for a dpmac_node.
>
> Use helper function phylink_fwnode_phy_connect() to find phy_dev and
> connect to mac->phylink.
>
> Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>

I don't think this does the full job.

> static int dpaa2_pcs_create(struct dpaa2_mac *mac,
> - struct device_node *dpmac_node, int id)
> + struct fwnode_handle *dpmac_node,
> + int id)
> {
> struct mdio_device *mdiodev;
> - struct device_node *node;
> + struct fwnode_handle *node;
>
> - node = of_parse_phandle(dpmac_node, "pcs-handle", 0);
> - if (!node) {
> + node = fwnode_find_reference(dpmac_node, "pcs-handle", 0);
> + if (IS_ERR(node)) {
> /* do not error out on old DTS files */
> netdev_warn(mac->net_dev, "pcs-handle node not found\n");
> return 0;
> }
>
> - if (!of_device_is_available(node)) {
> + if (!of_device_is_available(to_of_node(node))) {

If "node" is an ACPI node, then to_of_node() returns NULL, and
of_device_is_available(NULL) is false. So, if we're using ACPI
and we enter this path, we will always hit the error below:

> netdev_err(mac->net_dev, "pcs-handle node not available\n");
> - of_node_put(node);
> + of_node_put(to_of_node(node));
> return -ENODEV;
> }

> @@ -306,7 +321,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
> * error out if the interface mode requests them and there is no PHY
> * to act upon them
> */
> - if (of_phy_is_fixed_link(dpmac_node) &&
> + if (of_phy_is_fixed_link(to_of_node(dpmac_node)) &&

If "dpmac_node" is an ACPI node, to_of_node() will return NULL, and
of_phy_is_fixed_link() will oops.

--
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