[PATCH v3 06/22] usb: common: add API to get usb otg features from device tree

[Li Jun <jun.li-KZfg59tc24xl57MIdRCFDg@public.gmane.org>]

Check property of usb hardware to get otg version and if SRP, HNP and ADP
are supported.

Signed-off-by: Li Jun <jun.li-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 drivers/usb/common/common.c | 64 +++++++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/of.h      | 20 ++++++++++++++
 2 files changed, 84 insertions(+)

diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
index b530fd4..b882e95 100644
--- a/drivers/usb/common/common.c
+++ b/drivers/usb/common/common.c
@@ -154,6 +154,70 @@ bool of_usb_host_tpl_support(struct device_node *np)
 	return false;
 }
 EXPORT_SYMBOL_GPL(of_usb_host_tpl_support);
+
+/**
+ * of_usb_otg_srp_disabled -  to get if otg srp is disabled for the device
+ * @np: Pointer to the given device_node
+ *
+ * The function gets if SRP is disabled on the otg port
+ */
+bool of_usb_otg_srp_disabled(struct device_node *np)
+{
+	if (of_find_property(np, "srp-disable", NULL))
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(of_usb_otg_srp_disabled);
+
+/**
+ * of_usb_otg_hnp_disabled -  to get if otg hnp is disabled for the device
+ * @np: Pointer to the given device_node
+ *
+ * The function gets if HNP is disabled on the otg port
+ */
+bool of_usb_otg_hnp_disabled(struct device_node *np)
+{
+	if (of_find_property(np, "hnp-disable", NULL))
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(of_usb_otg_hnp_disabled);
+
+/**
+ * of_usb_otg_adp_disabled -  to get if otg adp is disabled for the device
+ * @np: Pointer to the given device_node
+ *
+ * The function gets if ADP is disabled on the otg port
+ */
+bool of_usb_otg_adp_disabled(struct device_node *np)
+{
+	if (of_find_property(np, "adp-disable", NULL))
+		return true;
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(of_usb_otg_adp_disabled);
+
+/**
+ * of_usb_get_otg_rev -  to get the otg release number the device is
+ * compliant with.
+ * @np: Pointer to the given device_node
+ *
+ * The function gets OTG and EH supplement release number in binary-coded
+ * decimal (i.e. 2.0 is 0200H).
+ */
+int of_usb_get_otg_rev(struct device_node *np)
+{
+	u32 otg_rev;
+
+	if (!of_property_read_u32(np, "otg-rev", &otg_rev))
+		return otg_rev;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(of_usb_get_otg_rev);
 #endif
 
 MODULE_LICENSE("GPL");
diff --git a/include/linux/usb/of.h b/include/linux/usb/of.h
index cfe0528..5b395bf 100644
--- a/include/linux/usb/of.h
+++ b/include/linux/usb/of.h
@@ -15,6 +15,10 @@
 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);
+bool of_usb_otg_srp_disabled(struct device_node *np);
+bool of_usb_otg_hnp_disabled(struct device_node *np);
+bool of_usb_otg_adp_disabled(struct device_node *np);
+int of_usb_get_otg_rev(struct device_node *np);
 #else
 static inline enum usb_dr_mode of_usb_get_dr_mode(struct device_node *np)
 {
@@ -30,6 +34,22 @@ static inline bool of_usb_host_tpl_support(struct device_node *np)
 {
 	return false;
 }
+static inline bool of_usb_otg_srp_disabled(struct device_node *np)
+{
+	return false;
+}
+static inline bool of_usb_otg_hnp_disabled(struct device_node *np)
+{
+	return false;
+}
+static inline bool of_usb_otg_adp_disabled(struct device_node *np)
+{
+	return false;
+}
+static inline int of_usb_get_otg_rev(struct device_node *np)
+{
+	return 0;
+}
 #endif
 
 #if IS_ENABLED(CONFIG_OF) && IS_ENABLED(CONFIG_USB_SUPPORT)
-- 
1.9.1

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