[v2,01/12] usb: typec: add API to get port type and preferred role

[Jun Li <jun.li@nxp.com>]

This patch add 2 APIs to get port type and preferred role from firmware
description.

Signed-off-by: Li Jun <jun.li@nxp.com>
---
change for v2
- Change the 2 APIs name and input para to be device_node pointer.

 drivers/usb/typec/typec.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/typec.h |  2 ++
 2 files changed, 48 insertions(+)

diff --git a/drivers/usb/typec/typec.c b/drivers/usb/typec/typec.c
index 735726c..e7b2802 100644
--- a/drivers/usb/typec/typec.c
+++ b/drivers/usb/typec/typec.c
@@ -9,6 +9,7 @@
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
+#include <linux/of.h>
 #include <linux/slab.h>
 #include <linux/usb/typec.h>
 
@@ -1246,6 +1247,51 @@ void typec_set_pwr_opmode(struct typec_port *port,
 }
 EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
 
+/**
+ * typec_of_get_port_type - Get the typec port type
+ * @np: device node from which the property value is to be read.
+ *
+ * This routine is used by typec hardware driver to read property port type
+ * from the device firmware description.
+ *
+ * Returns typec_port_type if success, otherwise negative error code.
+ */
+int typec_of_get_port_type(struct device_node *np)
+{
+	const char *type_str;
+	int ret;
+
+	ret = of_property_read_string(np, "port-type", &type_str);
+	if (ret < 0)
+		return ret;
+
+	return match_string(typec_port_types, ARRAY_SIZE(typec_port_types),
+								 type_str);
+}
+EXPORT_SYMBOL_GPL(typec_get_port_type);
+
+/**
+ * typec_of_get_preferred_role - Get the typec preferred role
+ * @np: device node from which the property value is to be read.
+ *
+ * This routine is used by typec hardware driver to read property default role
+ * from the device firmware description.
+ *
+ * Returns typec_role if success, otherwise negative error code.
+ */
+int typec_of_get_preferred_role(struct device_node *np)
+{
+	const char *power_str;
+	int ret;
+
+	ret = of_property_read_string(np, "default-role", &power_str);
+	if (ret < 0)
+		return ret;
+
+	return match_string(typec_roles, ARRAY_SIZE(typec_roles), power_str);
+}
+EXPORT_SYMBOL_GPL(typec_get_preferred_role);
+
 /* --------------------------------------- */
 
 /**
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index 0d44ce6..f2a581a 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -244,5 +244,7 @@ void typec_set_data_role(struct typec_port *port, enum typec_data_role role);
 void typec_set_pwr_role(struct typec_port *port, enum typec_role role);
 void typec_set_vconn_role(struct typec_port *port, enum typec_role role);
 void typec_set_pwr_opmode(struct typec_port *port, enum typec_pwr_opmode mode);
+int typec_of_get_port_type(struct device_node *np);
+int typec_of_get_preferred_role(struct device_node *np);
 
 #endif /* __LINUX_USB_TYPEC_H */