EHCI controllers will have a companion controller. However, on platform
bus, there was difficult to bind them in previous code. So, this
patch adds helper functions to bind them using a "companion" property.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda...@renesas.com>
---
Documentation/devicetree/bindings/usb/generic.txt | 1 +
drivers/usb/core/of.c | 36 +++++++++++++++++++++++
include/linux/usb/of.h | 10 +++++++
3 files changed, 47 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/generic.txt
b/Documentation/devicetree/bindings/usb/generic.txt
index bfadeb1..0a74ab8 100644
--- a/Documentation/devicetree/bindings/usb/generic.txt
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -22,6 +22,7 @@ Optional properties:
property is used if any real OTG features(HNP/SRP/ADP)
is enabled, if ADP is required, otg-rev should be
0x0200 or above.
+ - companion: phandle of a companion
- hnp-disable: tells OTG controllers we want to disable OTG HNP, normally HNP
is the basic function of real OTG except you want it
to be a srp-capable only B device.
diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c
index 3de4f88..033530b 100644
--- a/drivers/usb/core/of.c
+++ b/drivers/usb/core/of.c
@@ -18,6 +18,7 @@
*/
#include <linux/of.h>
+#include <linux/of_platform.h>
#include <linux/usb/of.h>
/**
@@ -46,3 +47,38 @@ struct device_node *usb_of_get_child_node(struct device_node
*parent,
}
EXPORT_SYMBOL_GPL(usb_of_get_child_node);
+/**
+ * usb_of_has_companion - To get if the device has a companion device
+ * @dev: the device pointer to get if it has a companion
+ *
+ * This function gets if the device has a companion property.
+ *
+ */
+bool usb_of_has_companion(struct device *dev)
+{
+ return !!of_find_property(dev->of_node, "companion", NULL);
+}
+EXPORT_SYMBOL_GPL(usb_of_has_companion);
+
+/**
+ * usb_of_get_companion_dev - Find the companion device
+ * @dev: the device pointer to find a companion
+ *
+ * Find the companion device from platform bus.
+ *
+ * Return: On success, a pointer to the companion device, %NULL on failure.
+ */
+struct device *usb_of_get_companion_dev(struct device *dev)
+{
+ struct device_node *node;
+ struct platform_device *pdev = NULL;
+
+ node = of_parse_phandle(dev->of_node, "companion", 0);
+ if (node)
+ pdev = of_find_device_by_node(node);
+
+ of_node_put(node);
+
+ return pdev ? &pdev->dev : NULL;
+}
+EXPORT_SYMBOL_GPL(usb_of_get_companion_dev);
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index 5ff9032..a5c7885 100644
--- a/include/linux/usb/of.h
+++ b/include/linux/usb/of.h
@@ -18,6 +18,8 @@ int of_usb_update_otg_caps(struct device_node *np,
struct usb_otg_caps *otg_caps);
struct device_node *usb_of_get_child_node(struct device_node *parent,
int portnum);
+bool usb_of_has_companion(struct device *dev);
+struct device *usb_of_get_companion_dev(struct device *dev);
#else
static inline enum usb_dr_mode
of_usb_get_dr_mode_by_phy(struct device_node *np, int arg0)
@@ -38,6 +40,14 @@ static inline int of_usb_update_otg_caps(struct device_node
*np,
{
return NULL;
}
+static inline bool usb_of_has_companion(struct device *dev)
+{
+ return false;
+}
+static inline struct device *usb_of_get_companion_dev(struct device *dev)
+{
+ return NULL;
+}
#endif
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
--
1.9.1
--
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