usb: otg: add device tree support to otg library

Added an API devm_usb_get_phy_by_phandle(), to get usb phy by passing a
device node phandle value. This function will return a pointer to
the phy on success, -EPROBE_DEFER if there is a device_node for the phandle,
but the phy has not been added, or a ERR_PTR() otherwise.

Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

2 files changed, 88 insertions, 0 deletions

diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
index 4bb4333c9653..e1814397ca3a 100644
--- a/drivers/usb/otg/otg.c
+++ b/drivers/usb/otg/otg.c
@@ -13,7 +13,9 @@
 #include <linux/export.h>
 #include <linux/err.h>
 #include <linux/device.h>
+#include <linux/module.h>
 #include <linux/slab.h>
+#include <linux/of.h>
 
 #include <linux/usb/otg.h>
 
@@ -54,6 +56,20 @@ static struct usb_phy *__usb_find_phy_dev(struct device *dev,
         return ERR_PTR(-ENODEV);
 }
 
+static struct usb_phy *__of_usb_find_phy(struct device_node *node)
+{
+        struct usb_phy  *phy;
+
+        list_for_each_entry(phy, &phy_list, head) {
+                if (node != phy->dev->of_node)
+                        continue;
+
+                return phy;
+        }
+
+        return ERR_PTR(-ENODEV);
+}
+
 static void devm_usb_phy_release(struct device *dev, void *res)
 {
         struct usb_phy *phy = *(struct usb_phy **)res;
@@ -129,6 +145,70 @@ err0:
 }
 EXPORT_SYMBOL(usb_get_phy);
 
+ /**
+ * devm_usb_get_phy_by_phandle - find the USB PHY by phandle
+ * @dev - device that requests this phy
+ * @phandle - name of the property holding the phy phandle value
+ * @index - the index of the phy
+ *
+ * Returns the phy driver associated with the given phandle value,
+ * after getting a refcount to it, -ENODEV if there is no such phy or
+ * -EPROBE_DEFER if there is a phandle to the phy, but the device is
+ * not yet loaded. While at that, it also associates the device with
+ * the phy using devres. On driver detach, release function is invoked
+ * on the devres data, then, devres data is freed.
+ *
+ * For use by USB host and peripheral drivers.
+ */
+struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
+        const char *phandle, u8 index)
+{
+        struct usb_phy  *phy = ERR_PTR(-ENOMEM), **ptr;
+        unsigned long   flags;
+        struct device_node *node;
+
+        if (!dev->of_node) {
+                dev_dbg(dev, "device does not have a device node entry\n");
+                return ERR_PTR(-EINVAL);
+        }
+
+        node = of_parse_phandle(dev->of_node, phandle, index);
+        if (!node) {
+                dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
+                        dev->of_node->full_name);
+                return ERR_PTR(-ENODEV);
+        }
+
+        ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
+        if (!ptr) {
+                dev_dbg(dev, "failed to allocate memory for devres\n");
+                goto err0;
+        }
+
+        spin_lock_irqsave(&phy_lock, flags);
+
+        phy = __of_usb_find_phy(node);
+        if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
+                phy = ERR_PTR(-EPROBE_DEFER);
+                devres_free(ptr);
+                goto err1;
+        }
+
+        *ptr = phy;
+        devres_add(dev, ptr);
+
+        get_device(phy->dev);
+
+err1:
+        spin_unlock_irqrestore(&phy_lock, flags);
+
+err0:
+        of_node_put(node);
+
+        return phy;
+}
+EXPORT_SYMBOL(devm_usb_get_phy_by_phandle);
+
 /**
  * usb_get_phy_dev - find the USB PHY
  * @dev - device that requests this phy
diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
index 359db7de61e4..15847cbdb512 100644
--- a/include/linux/usb/phy.h
+++ b/include/linux/usb/phy.h
@@ -167,6 +167,8 @@ extern struct usb_phy *devm_usb_get_phy(struct device *dev,
         enum usb_phy_type type);
 extern struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index);
 extern struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index);
+extern struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
+        const char *phandle, u8 index);
 extern void usb_put_phy(struct usb_phy *);
 extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
 extern int usb_bind_phy(const char *dev_name, u8 index,
@@ -193,6 +195,12 @@ static inline struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
         return NULL;
 }
 
+static inline struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
+        const char *phandle, u8 index)
+{
+        return NULL;
+}
+
 static inline void usb_put_phy(struct usb_phy *x)
 {
 }