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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>
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2 changed files with 88 additions and 0 deletions
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@ -13,7 +13,9 @@
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#include <linux/export.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/usb/otg.h>
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@ -54,6 +56,20 @@ static struct usb_phy *__usb_find_phy_dev(struct device *dev,
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return ERR_PTR(-ENODEV);
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}
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static struct usb_phy *__of_usb_find_phy(struct device_node *node)
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{
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struct usb_phy *phy;
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list_for_each_entry(phy, &phy_list, head) {
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if (node != phy->dev->of_node)
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continue;
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return phy;
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}
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return ERR_PTR(-ENODEV);
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}
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static void devm_usb_phy_release(struct device *dev, void *res)
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{
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struct usb_phy *phy = *(struct usb_phy **)res;
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@ -129,6 +145,70 @@ struct usb_phy *usb_get_phy(enum usb_phy_type type)
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}
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EXPORT_SYMBOL(usb_get_phy);
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/**
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* devm_usb_get_phy_by_phandle - find the USB PHY by phandle
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* @dev - device that requests this phy
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* @phandle - name of the property holding the phy phandle value
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* @index - the index of the phy
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*
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* Returns the phy driver associated with the given phandle value,
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* after getting a refcount to it, -ENODEV if there is no such phy or
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* -EPROBE_DEFER if there is a phandle to the phy, but the device is
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* not yet loaded. While at that, it also associates the device with
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* the phy using devres. On driver detach, release function is invoked
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* on the devres data, then, devres data is freed.
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*
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* For use by USB host and peripheral drivers.
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*/
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struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
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const char *phandle, u8 index)
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{
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struct usb_phy *phy = ERR_PTR(-ENOMEM), **ptr;
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unsigned long flags;
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struct device_node *node;
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if (!dev->of_node) {
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dev_dbg(dev, "device does not have a device node entry\n");
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return ERR_PTR(-EINVAL);
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}
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node = of_parse_phandle(dev->of_node, phandle, index);
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if (!node) {
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dev_dbg(dev, "failed to get %s phandle in %s node\n", phandle,
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dev->of_node->full_name);
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return ERR_PTR(-ENODEV);
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}
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ptr = devres_alloc(devm_usb_phy_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr) {
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dev_dbg(dev, "failed to allocate memory for devres\n");
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goto err0;
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}
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spin_lock_irqsave(&phy_lock, flags);
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phy = __of_usb_find_phy(node);
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if (IS_ERR(phy) || !try_module_get(phy->dev->driver->owner)) {
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phy = ERR_PTR(-EPROBE_DEFER);
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devres_free(ptr);
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goto err1;
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}
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*ptr = phy;
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devres_add(dev, ptr);
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get_device(phy->dev);
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err1:
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spin_unlock_irqrestore(&phy_lock, flags);
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err0:
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of_node_put(node);
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return phy;
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}
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EXPORT_SYMBOL(devm_usb_get_phy_by_phandle);
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/**
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* usb_get_phy_dev - find the USB PHY
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* @dev - device that requests this phy
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@ -167,6 +167,8 @@ extern struct usb_phy *devm_usb_get_phy(struct device *dev,
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enum usb_phy_type type);
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extern struct usb_phy *usb_get_phy_dev(struct device *dev, u8 index);
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extern struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index);
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extern struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
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const char *phandle, u8 index);
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extern void usb_put_phy(struct usb_phy *);
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extern void devm_usb_put_phy(struct device *dev, struct usb_phy *x);
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extern int usb_bind_phy(const char *dev_name, u8 index,
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@ -193,6 +195,12 @@ static inline struct usb_phy *devm_usb_get_phy_dev(struct device *dev, u8 index)
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return NULL;
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}
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static inline struct usb_phy *devm_usb_get_phy_by_phandle(struct device *dev,
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const char *phandle, u8 index)
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{
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return NULL;
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}
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static inline void usb_put_phy(struct usb_phy *x)
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{
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}
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