usb: typec: add typec_find_pwr_opmode

This patch adds a function that converts power operation mode string into
power operation mode value.

It is useful to configure power operation mode through device tree
property, as power capabilities may be linked to hardware design.

Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Link: https://lore.kernel.org/r/20200924090049.9041-3-amelie.delaunay@st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/typec/class.c

@@ -1448,6 +1448,21 @@ void typec_set_pwr_opmode(struct typec_port *port,
 }
 EXPORT_SYMBOL_GPL(typec_set_pwr_opmode);
 
+/**
+ * typec_find_pwr_opmode - Get the typec power operation mode capability
+ * @name: power operation mode string
+ *
+ * This routine is used to find the typec_pwr_opmode by its string @name.
+ *
+ * Returns typec_pwr_opmode if success, otherwise negative error code.
+ */
+int typec_find_pwr_opmode(const char *name)
+{
+	return match_string(typec_pwr_opmodes,
+			    ARRAY_SIZE(typec_pwr_opmodes), name);
+}
+EXPORT_SYMBOL_GPL(typec_find_pwr_opmode);
+
 /**
  * typec_find_orientation - Convert orientation string to enum typec_orientation
  * @name: Orientation string

include/linux/usb/typec.h

@@ -268,6 +268,7 @@ int typec_set_mode(struct typec_port *port, int mode);
 
 void *typec_get_drvdata(struct typec_port *port);
 
+int typec_find_pwr_opmode(const char *name);
 int typec_find_orientation(const char *name);
 int typec_find_port_power_role(const char *name);
 int typec_find_power_role(const char *name);