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Subject[PATCH v7 09/14] usb: of: add an API to get OTG device from USB controller node
Date
The OTG controller and the USB controller an be linked via the
'otg-controller' property in the USB controller's device node.

of_usb_get_otg() can be used to get the OTG controller device
from the USB controller's device node.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
Documentation/devicetree/bindings/usb/generic.txt | 3 +++
drivers/usb/common/common.c | 27 +++++++++++++++++++++++
include/linux/usb/of.h | 9 ++++++++
3 files changed, 39 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
index bba8257..f6866c1 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -24,6 +24,9 @@ Optional properties:
optional for OTG device.
- adp-disable: tells OTG controllers we want to disable OTG ADP, ADP is
optional for OTG device.
+ - otg-controller: phandle to otg controller. Host or gadget controllers can
+ contain this property to link it to a particular OTG
+ controller.

This is an attribute to a USB controller such as:

diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index e3d0161..d7ec471 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -238,6 +238,33 @@ int of_usb_update_otg_caps(struct device_node *np,
}
EXPORT_SYMBOL_GPL(of_usb_update_otg_caps);

+#ifdef CONFIG_USB_OTG
+/**
+ * of_usb_get_otg - get the OTG controller linked to the USB controller
+ * @np: Pointer to the device_node of the USB controller
+ * @otg_caps: Pointer to the target usb_otg_caps to be set
+ *
+ * Returns the OTG controller device or NULL on error.
+ */
+struct device *of_usb_get_otg(struct device_node *np)
+{
+ struct device_node *otg_np;
+ struct platform_device *pdev;
+
+ otg_np = of_parse_phandle(np, "otg-controller", 0);
+ if (!otg_np)
+ return NULL;
+
+ pdev = of_find_device_by_node(otg_np);
+ of_node_put(otg_np);
+ if (!pdev)
+ return NULL;
+
+ return &pdev->dev;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_otg);
+#endif
+
#endif

MODULE_LICENSE("GPL");
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index de3237f..499a4e8 100644
--- a/include/linux/usb/of.h
+++ b/include/linux/usb/of.h
@@ -40,6 +40,15 @@ static inline struct device_node *usb_of_get_child_node
}
#endif

+#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_OTG)
+struct device *of_usb_get_otg(struct device_node *np);
+#else
+static inline struct device *of_usb_get_otg(struct device_node *np)
+{
+ return NULL;
+}
+#endif
+
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
enum usb_phy_interface of_usb_get_phy_mode(struct device_node *np);
#else
--
2.7.4
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