staging: mt7621-pci: parse some dt properties from root port child nodes

Properties 'clocks', 'resets' and 'phys' have been moved from parent
node to the root port children. Hence we have to adapt the way device
tree is parsed in driver code to properly align things and make all
the stuff work.
Note that we moved from using 'devm_reset_control_get_exclusive() to
'of_reset_control_get_exclusive()' so we need to properly call the
'reset_control_put()' function manually in error and remove paths.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Link: https://lore.kernel.org/r/20210607120153.24989-6-sergio.paracuellos@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-pci/pci-mt7621.c

@@ -290,12 +290,14 @@ static int mt7621_pci_parse_request_of_pci_ranges(struct pci_host_bridge *host)
 }
 
 static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
+				  struct device_node *node,
 				  int slot)
 {
 	struct mt7621_pcie_port *port;
 	struct device *dev = pcie->dev;
 	struct platform_device *pdev = to_platform_device(dev);
 	char name[10];
+	int err;
 
 	port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
 	if (!port)
@@ -305,30 +307,32 @@ static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
 	if (IS_ERR(port->base))
 		return PTR_ERR(port->base);
 
-	snprintf(name, sizeof(name), "pcie%d", slot);
-	port->clk = devm_clk_get(dev, name);
+	port->clk = devm_get_clk_from_child(dev, node, NULL);
 	if (IS_ERR(port->clk)) {
 		dev_err(dev, "failed to get pcie%d clock\n", slot);
 		return PTR_ERR(port->clk);
 	}
 
-	snprintf(name, sizeof(name), "pcie%d", slot);
-	port->pcie_rst = devm_reset_control_get_exclusive(dev, name);
+	port->pcie_rst = of_reset_control_get_exclusive(node, NULL);
 	if (PTR_ERR(port->pcie_rst) == -EPROBE_DEFER) {
 		dev_err(dev, "failed to get pcie%d reset control\n", slot);
 		return PTR_ERR(port->pcie_rst);
 	}
 
 	snprintf(name, sizeof(name), "pcie-phy%d", slot);
-	port->phy = devm_phy_get(dev, name);
-	if (IS_ERR(port->phy) && slot != 1)
-		return PTR_ERR(port->phy);
+	port->phy = devm_of_phy_get(dev, node, name);
+	if (IS_ERR(port->phy)) {
+		dev_err(dev, "failed to get pcie-phy%d\n", slot);
+		err = PTR_ERR(port->phy);
+		goto remove_reset;
+	}
 
 	port->gpio_rst = devm_gpiod_get_index_optional(dev, "reset", slot,
 						       GPIOD_OUT_LOW);
 	if (IS_ERR(port->gpio_rst)) {
 		dev_err(dev, "Failed to get GPIO for PCIe%d\n", slot);
-		return PTR_ERR(port->gpio_rst);
+		err = PTR_ERR(port->gpio_rst);
+		goto remove_reset;
 	}
 
 	port->slot = slot;
@@ -338,6 +342,10 @@ static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
 	list_add_tail(&port->list, &pcie->ports);
 
 	return 0;
+
+remove_reset:
+	reset_control_put(port->pcie_rst);
+	return err;
 }
 
 static int mt7621_pcie_parse_dt(struct mt7621_pcie *pcie)
@@ -363,7 +371,7 @@ static int mt7621_pcie_parse_dt(struct mt7621_pcie *pcie)
 
 		slot = PCI_SLOT(err);
 
-		err = mt7621_pcie_parse_port(pcie, slot);
+		err = mt7621_pcie_parse_port(pcie, child, slot);
 		if (err) {
 			of_node_put(child);
 			return err;
@@ -550,6 +558,7 @@ static int mt7621_pci_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	const struct soc_device_attribute *attr;
+	struct mt7621_pcie_port *port;
 	struct mt7621_pcie *pcie;
 	struct pci_host_bridge *bridge;
 	int err;
@@ -579,7 +588,7 @@ static int mt7621_pci_probe(struct platform_device *pdev)
 	err = mt7621_pci_parse_request_of_pci_ranges(bridge);
 	if (err) {
 		dev_err(dev, "Error requesting pci resources from ranges");
-		return err;
+		goto remove_resets;
 	}
 
 	/* set resources limits */
@@ -591,12 +600,29 @@ static int mt7621_pci_probe(struct platform_device *pdev)
 	err = mt7621_pcie_enable_ports(pcie);
 	if (err) {
 		dev_err(dev, "Error enabling pcie ports\n");
-		return err;
+		goto remove_resets;
 	}
 
 	setup_cm_memory_region(pcie);
 
 	return mt7621_pcie_register_host(bridge);
+
+remove_resets:
+	list_for_each_entry(port, &pcie->ports, list)
+		reset_control_put(port->pcie_rst);
+
+	return err;
+}
+
+static int mt7621_pci_remove(struct platform_device *pdev)
+{
+	struct mt7621_pcie *pcie = platform_get_drvdata(pdev);
+	struct mt7621_pcie_port *port;
+
+	list_for_each_entry(port, &pcie->ports, list)
+		reset_control_put(port->pcie_rst);
+
+	return 0;
 }
 
 static const struct of_device_id mt7621_pci_ids[] = {
@@ -607,6 +633,7 @@ MODULE_DEVICE_TABLE(of, mt7621_pci_ids);
 
 static struct platform_driver mt7621_pci_driver = {
 	.probe = mt7621_pci_probe,
+	.remove = mt7621_pci_remove,
 	.driver = {
 		.name = "mt7621-pci",
 		.of_match_table = of_match_ptr(mt7621_pci_ids),