[PATCH v2 4/5] phy: miphy365x: Represent each PHY channel as a subnode

[Lee Jones]

phy: miphy365x: Represent each PHY channel as a DT subnode

This has the added advantages of being able to enable/disable each
of the channels as simply as enabling/disabling the DT node.

Suggested-by: Kishon Vijay Abraham I <kishon at ti.com>
Signed-off-by: Lee Jones <lee.jones at linaro.org>

diff --git a/drivers/phy/phy-miphy365x.c b/drivers/phy/phy-miphy365x.c
index 1109f42..2c4ea6e 100644
--- a/drivers/phy/phy-miphy365x.c
+++ b/drivers/phy/phy-miphy365x.c
@@ -17,6 +17,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
+#include <linux/of_address.h>
 #include <linux/clk.h>
 #include <linux/phy/phy.h>
 #include <linux/delay.h>
@@ -144,6 +145,7 @@ struct miphy365x {
 	void __iomem *pcie;
 	u8 type;
 	u8 port;
+	bool enabled;
 };
 
 struct miphy365x_dev {
@@ -468,7 +470,7 @@ static struct phy *miphy365x_xlate(struct device *dev,
 	struct miphy365x_dev *state = dev_get_drvdata(dev);
 	u8 port, type;
 
-	if (args->count != 2) {
+	if (args->args_count != 2) {
 		dev_err(dev, "Invalid number of cells in 'phy' property\n");
 		return ERR_PTR(-EINVAL);
 	}
@@ -484,6 +486,11 @@ static struct phy *miphy365x_xlate(struct device *dev,
 	if (WARN_ON(port >= ARRAY_SIZE(ports)))
 		return ERR_PTR(-EINVAL);
 
+	if (!state->phys[port].enabled) {
+		dev_warn(dev, "PHY port %d is disabled\n", port);
+		return ERR_PTR(-EINVAL);
+	}
+
 	if (type == MIPHY_TYPE_SATA)
 		state->phys[port].base = state->phys[port].sata;
 	else if (type == MIPHY_TYPE_PCIE)
@@ -503,38 +510,75 @@ static struct phy_ops miphy365x_ops = {
 	.owner		= THIS_MODULE,
 };
 
-static int miphy365x_get_base_addr(struct platform_device *pdev,
-				    struct miphy365x_phy *phy, u8 port)
+static int miphy365x_get_base_addr_one(struct platform_device *pdev,
+				       struct miphy365x *phy,
+				       struct device_node *child,
+				       int index)
 {
-	struct resource *res;
-	char type[6];
+	void __iomem *base;
+	const char *name;
+	int ret;
 
-	sprintf(type, "sata%d", port);
+	base = of_iomap(child, index);
+	if (!base) {
+		dev_err(&pdev->dev, "Failed to map %s\n", child->full_name);
+		return -EINVAL;
+	}
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, type);
-	if (!res)
-		return -ENODEV;
+	ret = of_property_read_string_index(child, "reg-names", index, &name);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"%s: no reg-names property not found\n", child->name);
+		return ret;
+	}
 
-	phy->sata = devm_ioremap(&pdev->dev, res->start, resource_size(res));
-	if (!phy->sata)
-		return -ENOMEM;
+	if (!strncmp(name, "sata", 4))
+		phy->sata = base;
+	else if (!strncmp(name, "pcie", 4))
+		phy->pcie = base;
+	else {
+		dev_err(&pdev->dev, "reg-names in %s not sata or pcie: %s",
+			child->name, name);
+		return -EINVAL;
+	}
 
-	sprintf(type, "pcie%d", port);
+	return 0;
+}
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, type);
-	if (!res)
-		return -ENODEV;
+static int miphy365x_get_base_addr(struct platform_device *pdev,
+				   struct miphy365x *phy,
+				   struct device_node *child)
+{
+	int index;
+	int ret;
 
-	phy->pcie = devm_ioremap(&pdev->dev, res->start, resource_size(res));
-	if (!phy->pcie)
-		return -ENOMEM;
+	/* Each port handles SATA or PCIE. */
+	for (index = 0; index < 2; index++) {
+		ret = miphy365x_get_base_addr_one(pdev, phy,
+						  child, index);
+		if (ret)
+			return ret;
+	}
 
 	return 0;
 }
 
-static int miphy365x_of_probe(struct device_node *np,
+static int miphy365x_of_probe(struct platform_device *pdev,
 			      struct miphy365x_dev *phy_dev)
 {
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *child;
+	int child_count = 0;
+
+	for_each_child_of_node(np, child)
+		child_count++;
+
+	if (child_count != ARRAY_SIZE(ports)) {
+		dev_err(&pdev->dev, "%d ports supported, %d supplied\n",
+			ARRAY_SIZE(ports), child_count);
+		return -EINVAL;
+	}
+
 	phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
 	if (IS_ERR(phy_dev->regmap)) {
 		dev_err(phy_dev->dev, "No syscfg phandle specified\n");
@@ -556,11 +600,10 @@ static int miphy365x_of_probe(struct device_node *np,
 
 static int miphy365x_probe(struct platform_device *pdev)
 {
-	struct device_node *np = pdev->dev.of_node;
+	struct device_node *child, *np = pdev->dev.of_node;
 	struct miphy365x_dev *phy_dev;
 	struct device *dev = &pdev->dev;
 	struct phy_provider *provider;
-	u8 port;
 	int ret;
 
 	if (!np) {
@@ -572,7 +615,7 @@ static int miphy365x_probe(struct platform_device *pdev)
 	if (!phy_dev)
 		return -ENOMEM;
 
-	ret = miphy365x_of_probe(np, phy_dev);
+	ret = miphy365x_of_probe(pdev, phy_dev);
 	if (ret)
 		return ret;
 
@@ -582,8 +625,9 @@ static int miphy365x_probe(struct platform_device *pdev)
 
 	mutex_init(&phy_dev->miphy_mutex);
 
-	for (port = 0; port < ARRAY_SIZE(ports); port++) {
+	for_each_child_of_node(np, child) {
 		struct phy *phy;
+		static int port = 0;
 
 		phy = devm_phy_create(dev, &miphy365x_ops, NULL);
 		if (IS_ERR(phy)) {
@@ -591,15 +635,17 @@ static int miphy365x_probe(struct platform_device *pdev)
 			return PTR_ERR(phy);
 		}
 
-		phy_dev->phys[port].phy  = phy;
-		phy_dev->phys[port].port = port;
-
-		ret = miphy365x_get_base_addr(pdev,
-					&phy_dev->phys[port], port);
+		ret = miphy365x_get_base_addr(pdev, &phy_dev->phys[port],
+					      child);
 		if (ret)
 			return ret;
 
+		phy_dev->phys[port].phy  = phy;
+		phy_dev->phys[port].port = port;
+		phy_dev->phys[port].enabled = !!of_device_is_available(child);
+
 		phy_set_drvdata(phy, &phy_dev->phys[port]);
+		port++;
 	}
 
 	provider = devm_of_phy_provider_register(dev, miphy365x_xlate);