usb: otg: add device tree support to otg library (5d3c28b5) · Commits · 戴 / test

drivers/usb/otg/otg.c

+80 −0

Original line number	Diff line number	Diff line
		@@ -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

include/linux/usb/phy.h

+8 −0

Original line number	Diff line number	Diff line
		@@ -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)
		{
		}

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