phy: Add API for a bulk of phys

This patch adds a "bulk" API to the phy API in order to
get/init/exit/power on/off a group of phys associated
with a device.

The bulk API will avoid adding a copy of the same code to
manage a group of phys in drivers.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Reviewed-by: Weijie Gao <weijie.gao@mediatek.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>

drivers/phy/phy-uclass.c

@@ -6,6 +6,7 @@
 
 #include <common.h>
 #include <dm.h>
+#include <dm/devres.h>
 #include <generic-phy.h>
 
 static inline struct phy_ops *phy_dev_ops(struct udevice *dev)
@@ -167,6 +168,102 @@ int generic_phy_power_off(struct phy *phy)
 	return ops->power_off ? ops->power_off(phy) : 0;
 }
 
+int generic_phy_get_bulk(struct udevice *dev, struct phy_bulk *bulk)
+{
+	int i, ret, count;
+
+	bulk->count = 0;
+
+	/* Return if no phy declared */
+	if (!dev_read_prop(dev, "phys", NULL))
+		return 0;
+
+	count = dev_count_phandle_with_args(dev, "phys", "#phy-cells");
+	if (count < 1)
+		return count;
+
+	bulk->phys = devm_kcalloc(dev, count, sizeof(struct phy), GFP_KERNEL);
+	if (!bulk->phys)
+		return -ENOMEM;
+
+	for (i = 0; i < count; i++) {
+		ret = generic_phy_get_by_index(dev, i, &bulk->phys[i]);
+		if (ret) {
+			pr_err("Failed to get PHY%d for %s\n", i, dev->name);
+			return ret;
+		}
+		bulk->count++;
+	}
+
+	return 0;
+}
+
+int generic_phy_init_bulk(struct phy_bulk *bulk)
+{
+	struct phy *phys = bulk->phys;
+	int i, ret;
+
+	for (i = 0; i < bulk->count; i++) {
+		ret = generic_phy_init(&phys[i]);
+		if (ret) {
+			pr_err("Can't init PHY%d\n", i);
+			goto phys_init_err;
+		}
+	}
+
+	return 0;
+
+phys_init_err:
+	for (; i > 0; i--)
+		generic_phy_exit(&phys[i - 1]);
+
+	return ret;
+}
+
+int generic_phy_exit_bulk(struct phy_bulk *bulk)
+{
+	struct phy *phys = bulk->phys;
+	int i, ret = 0;
+
+	for (i = 0; i < bulk->count; i++)
+		ret |= generic_phy_exit(&phys[i]);
+
+	return ret;
+}
+
+int generic_phy_power_on_bulk(struct phy_bulk *bulk)
+{
+	struct phy *phys = bulk->phys;
+	int i, ret;
+
+	for (i = 0; i < bulk->count; i++) {
+		ret = generic_phy_power_on(&phys[i]);
+		if (ret) {
+			pr_err("Can't power on PHY%d\n", i);
+			goto phys_poweron_err;
+		}
+	}
+
+	return 0;
+
+phys_poweron_err:
+	for (; i > 0; i--)
+		generic_phy_power_off(&phys[i - 1]);
+
+	return ret;
+}
+
+int generic_phy_power_off_bulk(struct phy_bulk *bulk)
+{
+	struct phy *phys = bulk->phys;
+	int i, ret = 0;
+
+	for (i = 0; i < bulk->count; i++)
+		ret |= generic_phy_power_off(&phys[i]);
+
+	return ret;
+}
+
 UCLASS_DRIVER(phy) = {
 	.id		= UCLASS_PHY,
 	.name		= "phy",

include/generic-phy.h

@@ -124,6 +124,23 @@ struct phy_ops {
 	int	(*power_off)(struct phy *phy);
 };
 
+/**
+ * struct phy_bulk - A handle to (allowing control of) a bulk of phys.
+ *
+ * Consumers provide storage for the phy bulk. The content of the structure is
+ * managed solely by the phy API. A phy bulk struct is initialized
+ * by "get"ing the phy bulk struct.
+ * The phy bulk struct is passed to all other bulk phy APIs to apply
+ * the API to all the phy in the bulk struct.
+ *
+ * @phys: An array of phy handles.
+ * @count: The number of phy handles in the phys array.
+ */
+struct phy_bulk {
+	struct phy *phys;
+	unsigned int count;
+};
+
 #ifdef CONFIG_PHY
 
 /**
@@ -250,6 +267,55 @@ int generic_phy_get_by_node(ofnode node, int index, struct phy *phy);
 int generic_phy_get_by_name(struct udevice *user, const char *phy_name,
 			    struct phy *phy);
 
+/**
+ * generic_phy_get_bulk - Get all phys of a device.
+ *
+ * This looks up and gets all phys of the consumer device; each device is
+ * assumed to have n phys associated with it somehow, and this function finds
+ * and gets all of them in a separate structure.
+ *
+ * @dev:	The consumer device.
+ * @bulk	A pointer to a phy bulk struct to initialize.
+ * @return 0 if OK, or a negative error code.
+ */
+int generic_phy_get_bulk(struct udevice *dev, struct phy_bulk *bulk);
+
+/**
+ * generic_phy_init_bulk() - Initialize all phys in a phy bulk struct.
+ *
+ * @bulk:	A phy bulk struct that was previously successfully requested
+ *		by generic_phy_get_bulk().
+ * @return 0 if OK, or negative error code.
+ */
+int generic_phy_init_bulk(struct phy_bulk *bulk);
+
+/**
+ * generic_phy_exit_bulk() - de-initialize all phys in a phy bulk struct.
+ *
+ * @bulk:	A phy bulk struct that was previously successfully requested
+ *		by generic_phy_get_bulk().
+ * @return 0 if OK, or negative error code.
+ */
+int generic_phy_exit_bulk(struct phy_bulk *bulk);
+
+/**
+ * generic_phy_power_on_bulk() - Power on all phys in a phy	bulk struct.
+ *
+ * @bulk:	A phy bulk struct that was previously successfully requested
+ *		by generic_phy_get_bulk().
+ * @return 0 if OK, or negative error code.
+ */
+int generic_phy_power_on_bulk(struct phy_bulk *bulk);
+
+/**
+ * generic_phy_power_off_bulk() - Power off all phys in a phy bulk struct.
+ *
+ * @bulk:	A phy bulk struct that was previously successfully requested
+ *		by generic_phy_get_bulk().
+ * @return 0 if OK, or negative error code.
+ */
+int generic_phy_power_off_bulk(struct phy_bulk *bulk);
+
 #else /* CONFIG_PHY */
 
 static inline int generic_phy_init(struct phy *phy)
@@ -289,6 +355,32 @@ static inline int generic_phy_get_by_name(struct udevice *user, const char *phy_
 	return 0;
 }
 
+static inline int
+generic_phy_get_bulk(struct udevice *dev, struct phy_bulk *bulk)
+{
+	return 0;
+}
+
+static inline int generic_phy_init_bulk(struct phy_bulk *bulk)
+{
+	return 0;
+}
+
+static inline int generic_phy_exit_bulk(struct phy_bulk *bulk)
+{
+	return 0;
+}
+
+static inline int generic_phy_power_on_bulk(struct phy_bulk *bulk)
+{
+	return 0;
+}
+
+static inline int generic_phy_power_off_bulk(struct phy_bulk *bulk)
+{
+	return 0;
+}
+
 #endif /* CONFIG_PHY */
 
 /**