thunderbolt: Update lc.c function documentation

Make lc.c function documentation compliant with current kernel-doc
standards. No functional changes.

Signed-off-by: Alan Borzeszkowski <alan.borzeszkowski@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Author: aborzesz

drivers/thunderbolt/lc.c

@@ -14,6 +14,8 @@
  * tb_lc_read_uuid() - Read switch UUID from link controller common register
  * @sw: Switch whose UUID is read
  * @uuid: UUID is placed here
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_read_uuid(struct tb_switch *sw, u32 *uuid)
 {
@@ -52,9 +54,10 @@ static int find_port_lc_cap(struct tb_port *port)
  * @port: Port that is reset
  *
  * Triggers downstream port reset through link controller registers.
- * Returns %0 in case of success negative errno otherwise. Only supports
- * non-USB4 routers with link controller (that's Thunderbolt 2 and
- * Thunderbolt 3).
+ * Only supports non-USB4 routers with link controller (that's
+ * Thunderbolt 2 and Thunderbolt 3).
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_reset_port(struct tb_port *port)
 {
@@ -132,6 +135,8 @@ static int tb_lc_set_port_configured(struct tb_port *port, bool configured)
  * @port: Port that is set as configured
  *
  * Sets the port configured for power management purposes.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_configure_port(struct tb_port *port)
 {
@@ -143,6 +148,8 @@ int tb_lc_configure_port(struct tb_port *port)
  * @port: Port that is set as configured
  *
  * Sets the port unconfigured for power management purposes.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 void tb_lc_unconfigure_port(struct tb_port *port)
 {
@@ -184,8 +191,10 @@ static int tb_lc_set_xdomain_configured(struct tb_port *port, bool configure)
  * tb_lc_configure_xdomain() - Inform LC that the link is XDomain
  * @port: Switch downstream port connected to another host
  *
- * Sets the lane configured for XDomain accordingly so that the LC knows
- * about this. Returns %0 in success and negative errno in failure.
+ * Sets the lane configured for XDomain accordingly so that LC knows
+ * about this.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_configure_xdomain(struct tb_port *port)
 {
@@ -211,7 +220,7 @@ void tb_lc_unconfigure_xdomain(struct tb_port *port)
  * sleep. Should be called for those downstream lane adapters that were
  * not connected (tb_lc_configure_port() was not called) before sleep.
  *
- * Returns %0 in success and negative errno in case of failure.
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_start_lane_initialization(struct tb_port *port)
 {
@@ -244,6 +253,8 @@ int tb_lc_start_lane_initialization(struct tb_port *port)
  *
  * TB_LC_LINK_ATTR_CPS bit reflects if the link supports CLx including
  * active cables (if connected on the link).
+ *
+ * Return: %true if CLx is supported, %false otherwise.
  */
 bool tb_lc_is_clx_supported(struct tb_port *port)
 {
@@ -266,7 +277,8 @@ bool tb_lc_is_clx_supported(struct tb_port *port)
  * tb_lc_is_usb_plugged() - Is there USB device connected to port
  * @port: Device router lane 0 adapter
  *
- * Returns true if the @port has USB type-C device connected.
+ * Return: %true if the @port has USB Type-C device connected, %false
+ * otherwise.
  */
 bool tb_lc_is_usb_plugged(struct tb_port *port)
 {
@@ -292,7 +304,8 @@ bool tb_lc_is_usb_plugged(struct tb_port *port)
  * tb_lc_is_xhci_connected() - Is the internal xHCI connected
  * @port: Device router lane 0 adapter
  *
- * Returns true if the internal xHCI has been connected to @port.
+ * Return: %true if the internal xHCI has been connected to
+ * @port, %false otherwise.
  */
 bool tb_lc_is_xhci_connected(struct tb_port *port)
 {
@@ -343,9 +356,10 @@ static int __tb_lc_xhci_connect(struct tb_port *port, bool connect)
  * tb_lc_xhci_connect() - Connect internal xHCI
  * @port: Device router lane 0 adapter
  *
- * Tells LC to connect the internal xHCI to @port. Returns %0 on success
- * and negative errno in case of failure. Can be called for Thunderbolt 3
- * routers only.
+ * Tells LC to connect the internal xHCI to @port. Can be called for
+ * Thunderbolt 3 routers only.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_xhci_connect(struct tb_port *port)
 {
@@ -408,6 +422,8 @@ static int tb_lc_set_wake_one(struct tb_switch *sw, unsigned int offset,
  * @flags: Wakeup flags (%0 to disable)
  *
  * For each LC sets wake bits accordingly.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_set_wake(struct tb_switch *sw, unsigned int flags)
 {
@@ -447,6 +463,8 @@ int tb_lc_set_wake(struct tb_switch *sw, unsigned int flags)
  *
  * Let the switch link controllers know that the switch is going to
  * sleep.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_set_sleep(struct tb_switch *sw)
 {
@@ -491,6 +509,8 @@ int tb_lc_set_sleep(struct tb_switch *sw)
  *
  * Checks whether conditions for lane bonding from parent to @sw are
  * possible.
+ *
+ * Return: %true if lane bonding is possible, %false otherwise.
  */
 bool tb_lc_lane_bonding_possible(struct tb_switch *sw)
 {
@@ -562,6 +582,8 @@ static int tb_lc_dp_sink_available(struct tb_switch *sw, int sink)
  *
  * Queries through LC SNK_ALLOCATION registers whether DP sink is available
  * for the given DP IN port or not.
+ *
+ * Return: %true if DP sink is available, %false otherwise.
  */
 bool tb_lc_dp_sink_query(struct tb_switch *sw, struct tb_port *in)
 {
@@ -586,10 +608,12 @@ bool tb_lc_dp_sink_query(struct tb_switch *sw, struct tb_port *in)
  * @sw: Switch whose DP sink is allocated
  * @in: DP IN port the DP sink is allocated for
  *
- * Allocate DP sink for @in via LC SNK_ALLOCATION registers. If the
- * resource is available and allocation is successful returns %0. In all
- * other cases returs negative errno. In particular %-EBUSY is returned if
- * the resource was not available.
+ * Allocate DP sink for @in via LC SNK_ALLOCATION registers.
+ *
+ * Return:
+ * * %0 - If the resource is available and allocation is successful.
+ * * %-EBUSY - If resource is not available.
+ * * Negative errno - Another error occurred.
  */
 int tb_lc_dp_sink_alloc(struct tb_switch *sw, struct tb_port *in)
 {
@@ -637,6 +661,8 @@ int tb_lc_dp_sink_alloc(struct tb_switch *sw, struct tb_port *in)
  * @in: DP IN port whose DP sink is de-allocated
  *
  * De-allocate DP sink from @in using LC SNK_ALLOCATION registers.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_dp_sink_dealloc(struct tb_switch *sw, struct tb_port *in)
 {
@@ -680,6 +706,8 @@ int tb_lc_dp_sink_dealloc(struct tb_switch *sw, struct tb_port *in)
  *
  * This is useful to let authentication cycle pass even without
  * a Thunderbolt link present.
+ *
+ * Return: %0 on success, negative errno otherwise.
  */
 int tb_lc_force_power(struct tb_switch *sw)
 {