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@xxxxxxxxxxxxxx>
Signed-off-by: Kishon Vijay Abraham I <kishon@xxxxxx>
---
drivers/usb/otg/otg.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/phy.h | 8 +++++
2 files changed, 85 insertions(+)
diff --git a/drivers/usb/otg/otg.c b/drivers/usb/otg/otg.c
index dbf2043..e9799bb 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>
@@ -34,6 +36,20 @@ static struct usb_phy *__usb_find_phy(struct device *dev, u8 index)
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;
@@ -109,6 +125,67 @@ 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 = NULL, **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");
+ return ERR_PTR(-ENOMEM);
+ }
