Check property of usb hardware to get otg version and if SRP, HNP and ADP
are supported.
Signed-off-by: Li Jun <jun.li@xxxxxxxxxxxxx>
---
drivers/usb/common/common.c | 29 +++++++++++++++++++++++++++++
include/linux/usb/of.h | 7 +++++++
2 files changed, 36 insertions(+)
diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index b530fd4..b846172 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -154,6 +154,35 @@ bool of_usb_host_tpl_support(struct device_node *np)
return false;
}
EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
+
+/**
+ * of_usb_get_otg_caps - to get usb otg capabilities according to
+ * the passed properties in DT.
+ * @np: Pointer to the given device_node
+ * @otg_caps: Pointer to the target usb_otg_caps to be set
+ *
+ * The function gets and sets the otg capabilities
+ */
+void of_usb_get_otg_caps(struct device_node *np, struct usb_otg_caps *otg_caps)
+{
+ u32 otg_rev;
+
+ if (!otg_caps)
+ return;
+
+ if (!of_property_read_u32(np, "otg-rev", &otg_rev)) {
+ otg_caps->otg_rev = otg_rev;
+ if (!of_find_property(np, "hnp-disable", NULL))
+ otg_caps->hnp_support = true;
+ if (!of_find_property(np, "srp-disable", NULL))
+ otg_caps->hnp_support = true;
+ if (!of_find_property(np, "adp-disable", NULL) &&
+ (otg_caps->otg_rev >= 0x0200))
+ otg_caps->hnp_support = true;
+ }
+}
+EXPORT_SYMBOL_GPL(of_usb_get_otg_caps);
+
#endif
MODULE_LICENSE("GPL");
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index cfe0528..bbf302b9 100644
--- a/include/linux/usb/of.h
+++ b/include/linux/usb/of.h
@@ -15,6 +15,8 @@
enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np);
enum usb_device_speed of_usb_get_maximum_speed(struct device_node *np);
bool of_usb_host_tpl_support(struct device_node *np);
+void of_usb_get_otg_caps(struct device_node *np,
+ struct usb_otg_caps *otg_caps);
#else
static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
{
@@ -30,6 +32,11 @@ static inline bool of_usb_host_tpl_support(struct device_node *np)
{
return false;
}
+static inline void of_usb_get_otg_caps(struct device_node *np,
+ struct usb_otg_caps *otg_caps)
+{
+
+}
#endif
#if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
--
1.9.1
--
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