[PATCH net-next v9 15/15] net: dpaa2-mac: Add ACPI support for DPAA2 MAC driver

[Ioana Ciornei <ciorneiioana@gmail.com>]

From: Calvin Johnson <calvin.johnson@oss.nxp.com>

Modify dpaa2_mac_get_node() to get the dpmac fwnode from either
DT or ACPI.

Modify dpaa2_mac_get_if_mode() to get interface mode from dpmac_node
which is a fwnode.

Modify dpaa2_pcs_create() to create pcs from dpmac_node fwnode.

Modify dpaa2_mac_connect() to support ACPI along with DT.

Signed-off-by: Calvin Johnson <calvin.johnson@oss.nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Acked-by: Rafael J. Wysocki <rafael@kernel.org> # from the ACPI side
Acked-by: Grant Likely <grant.likely@arm.com>
---

Changes in v9: None
Changes in v8:
- adjust code over latest changes applied on the driver

Changes in v7:
- remove unnecassary checks

Changes in v6:
- use dev_fwnode()
- remove useless else
- replace of_device_is_available() to fwnode_device_is_available()

Changes in v5:
- replace fwnode_get_id() with OF and ACPI function calls

Changes in v4: None
Changes in v3: None
Changes in v2:
- Refactor OF functions to use fwnode functions


 .../net/ethernet/freescale/dpaa2/dpaa2-mac.c  | 88 +++++++++++--------
 .../net/ethernet/freescale/dpaa2/dpaa2-mac.h  |  2 +-
 2 files changed, 53 insertions(+), 37 deletions(-)

diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
index 4dfadf2b70d6..ae6d382d8735 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.c
@@ -1,6 +1,9 @@
 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 /* Copyright 2019 NXP */
 
+#include <linux/acpi.h>
+#include <linux/property.h>
+
 #include "dpaa2-eth.h"
 #include "dpaa2-mac.h"
 
@@ -34,39 +37,51 @@ static int phy_mode(enum dpmac_eth_if eth_if, phy_interface_t *if_mode)
 	return 0;
 }
 
-/* Caller must call of_node_put on the returned value */
-static struct device_node *dpaa2_mac_get_node(u16 dpmac_id)
+static struct fwnode_handle *dpaa2_mac_get_node(struct device *dev,
+						u16 dpmac_id)
 {
-	struct device_node *dpmacs, *dpmac = NULL;
-	u32 id;
+	struct fwnode_handle *fwnode, *parent, *child  = NULL;
+	struct device_node *dpmacs = NULL;
 	int err;
+	u32 id;
 
-	dpmacs = of_find_node_by_name(NULL, "dpmacs");
-	if (!dpmacs)
-		return NULL;
+	fwnode = dev_fwnode(dev->parent);
+	if (is_of_node(fwnode)) {
+		dpmacs = of_find_node_by_name(NULL, "dpmacs");
+		if (!dpmacs)
+			return NULL;
+		parent = of_fwnode_handle(dpmacs);
+	} else if (is_acpi_node(fwnode)) {
+		parent = fwnode;
+	}
 
-	while ((dpmac = of_get_next_child(dpmacs, dpmac)) != NULL) {
-		err = of_property_read_u32(dpmac, "reg", &id);
+	fwnode_for_each_child_node(parent, child) {
+		err = -EINVAL;
+		if (is_acpi_device_node(child))
+			err = acpi_get_local_address(ACPI_HANDLE_FWNODE(child), &id);
+		else if (is_of_node(child))
+			err = of_property_read_u32(to_of_node(child), "reg", &id);
 		if (err)
 			continue;
-		if (id == dpmac_id)
-			break;
-	}
 
+		if (id == dpmac_id) {
+			of_node_put(dpmacs);
+			return child;
+		}
+	}
 	of_node_put(dpmacs);
-
-	return dpmac;
+	return NULL;
 }
 
-static int dpaa2_mac_get_if_mode(struct device_node *node,
+static int dpaa2_mac_get_if_mode(struct fwnode_handle *dpmac_node,
 				 struct dpmac_attr attr)
 {
 	phy_interface_t if_mode;
 	int err;
 
-	err = of_get_phy_mode(node, &if_mode);
-	if (!err)
-		return if_mode;
+	err = fwnode_get_phy_mode(dpmac_node);
+	if (err > 0)
+		return err;
 
 	err = phy_mode(attr.eth_if, &if_mode);
 	if (!err)
@@ -235,26 +250,27 @@ static const struct phylink_mac_ops dpaa2_mac_phylink_ops = {
 };
 
 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 (!fwnode_device_is_available(node)) {
 		netdev_err(mac->net_dev, "pcs-handle node not available\n");
-		of_node_put(node);
+		fwnode_handle_put(node);
 		return -ENODEV;
 	}
 
-	mdiodev = of_mdio_find_device(node);
-	of_node_put(node);
+	mdiodev = fwnode_mdio_find_device(node);
+	fwnode_handle_put(node);
 	if (!mdiodev)
 		return -EPROBE_DEFER;
 
@@ -283,13 +299,13 @@ static void dpaa2_pcs_destroy(struct dpaa2_mac *mac)
 int dpaa2_mac_connect(struct dpaa2_mac *mac)
 {
 	struct net_device *net_dev = mac->net_dev;
-	struct device_node *dpmac_node;
+	struct fwnode_handle *dpmac_node;
 	struct phylink *phylink;
 	int err;
 
 	mac->if_link_type = mac->attr.link_type;
 
-	dpmac_node = mac->of_node;
+	dpmac_node = mac->fw_node;
 	if (!dpmac_node) {
 		netdev_err(net_dev, "No dpmac@%d node found.\n", mac->attr.id);
 		return -ENODEV;
@@ -304,7 +320,7 @@ 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)) &&
 	    (mac->if_mode == PHY_INTERFACE_MODE_RGMII_ID ||
 	     mac->if_mode == PHY_INTERFACE_MODE_RGMII_RXID ||
 	     mac->if_mode == PHY_INTERFACE_MODE_RGMII_TXID)) {
@@ -324,7 +340,7 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 	mac->phylink_config.type = PHYLINK_NETDEV;
 
 	phylink = phylink_create(&mac->phylink_config,
-				 of_fwnode_handle(dpmac_node), mac->if_mode,
+				 dpmac_node, mac->if_mode,
 				 &dpaa2_mac_phylink_ops);
 	if (IS_ERR(phylink)) {
 		err = PTR_ERR(phylink);
@@ -335,9 +351,9 @@ int dpaa2_mac_connect(struct dpaa2_mac *mac)
 	if (mac->pcs)
 		phylink_set_pcs(mac->phylink, &mac->pcs->pcs);
 
-	err = phylink_of_phy_connect(mac->phylink, dpmac_node, 0);
+	err = phylink_fwnode_phy_connect(mac->phylink, dpmac_node, 0);
 	if (err) {
-		netdev_err(net_dev, "phylink_of_phy_connect() = %d\n", err);
+		netdev_err(net_dev, "phylink_fwnode_phy_connect() = %d\n", err);
 		goto err_phylink_destroy;
 	}
 
@@ -384,8 +400,8 @@ int dpaa2_mac_open(struct dpaa2_mac *mac)
 	/* Find the device node representing the MAC device and link the device
 	 * behind the associated netdev to it.
 	 */
-	mac->of_node = dpaa2_mac_get_node(mac->attr.id);
-	net_dev->dev.of_node = mac->of_node;
+	mac->fw_node = dpaa2_mac_get_node(&mac->mc_dev->dev, mac->attr.id);
+	net_dev->dev.of_node = to_of_node(mac->fw_node);
 
 	return 0;
 
@@ -399,8 +415,8 @@ void dpaa2_mac_close(struct dpaa2_mac *mac)
 	struct fsl_mc_device *dpmac_dev = mac->mc_dev;
 
 	dpmac_close(mac->mc_io, 0, dpmac_dev->mc_handle);
-	if (mac->of_node)
-		of_node_put(mac->of_node);
+	if (mac->fw_node)
+		fwnode_handle_put(mac->fw_node);
 }
 
 static char dpaa2_mac_ethtool_stats[][ETH_GSTRING_LEN] = {
diff --git a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
index 8ebcb3420d02..7842cbb2207a 100644
--- a/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
+++ b/drivers/net/ethernet/freescale/dpaa2/dpaa2-mac.h
@@ -24,7 +24,7 @@ struct dpaa2_mac {
 	phy_interface_t if_mode;
 	enum dpmac_link_type if_link_type;
 	struct lynx_pcs *pcs;
-	struct device_node *of_node;
+	struct fwnode_handle *fw_node;
 };
 
 bool dpaa2_mac_is_type_fixed(struct fsl_mc_device *dpmac_dev,
-- 
2.31.1