Some USB phy drivers have different handling for the controller in each
dr_mode. But the phy driver does not have visibility to the dr_mode of
the controller.
This adds an api to return the dr_mode of the controller which
associates the given phy node.
Signed-off-by: Bin Liu <b-...@ti.com>
---
v4: - iterating all phy nodes in the associated controller
- add of_node_put() to decrement refcount
v3: search controller node from dt root, as the phy and controller nodes
might not have the same parent.
v2: move drivers/usb/phy/phy-am335x.c changes into patch 3/3.
drivers/usb/common/common.c | 36 ++++++++++++++++++++++++++++++++++++
include/linux/usb/of.h | 6 ++++++
2 files changed, 42 insertions(+)
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index b530fd4..e3da800 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -114,6 +114,42 @@ enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
EXPORT_SYMBOL_GPL(of_usb_get_dr_mode);
/**
+ * of_usb_get_dr_mode_by_phy - Get dual role mode for the controller device
+ * which is associated with the given phy device_node
+ * @np: Pointer to the given phy device_node
+ *
+ * In dts a usb controller associates with phy devices. The function gets
+ * the string from property 'dr_mode' of the controller associated with the
+ * given phy device node, and returns the correspondig enum usb_dr_mode.
+ */
+enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *phy_np)
+{
+ struct device_node *controller = NULL;
+ struct device_node *phy;
+ enum usb_dr_mode dr_mode;
+ int index;
+
+ do {
+ controller = of_find_node_with_property(controller, "phys");
+ index = 0;
+ do {
+ phy = of_parse_phandle(controller, "phys", index);
+ of_node_put(phy);
+ if (phy == phy_np)
+ goto finish;
+ index++;
+ } while (phy);
+ } while (controller);
+
+finish:
+ dr_mode = of_usb_get_dr_mode(controller);
+ of_node_put(controller);
+
+ return dr_mode;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_dr_mode_by_phy);
+
+/**
* of_usb_get_maximum_speed - Get maximum requested speed for a given USB
* controller.
* @np: Pointer to the given device_node
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index cfe0528..14ebd5a 100644
--- a/include/linux/usb/of.h
+++ b/include/linux/usb/of.h
@@ -13,6 +13,7 @@
#if IS_ENABLED(CONFIG_OF)
enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np);
+enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *phy_np);
enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np);
bool of_usb_host_tpl_support(struct device_node *np);
#else
@@ -21,6 +22,11 @@ static inline enum usb_dr_mode of_usb_get_dr_mode(struct
device_node *np)
return USB_DR_MODE_UNKNOWN;
}
+enum usb_dr_mode of_usb_get_dr_mode_by_phy(struct device_node *phy_np)
+{
+ return USB_DR_MODE_UNKNOWN;
+}
+
static inline enum usb_device_speed
of_usb_get_maximum_speed(struct device_node *np)
{
--
1.8.4
--
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