[PATCH net-next V3] net: xilinx: axienet: Fix kernel-doc warnings for missing return descriptions

[Suraj Gupta <suraj.gupta2@amd.com>]

Add missing "Return:" sections to kernel-doc comments for four functions:
- axienet_calc_cr()
- axienet_device_reset()
- axienet_free_tx_chain()
- axienet_dim_coalesce_count_rx()

Also standardize the return documentation format by replacing inline
"Returns" text with proper "Return:" tags as per kernel documentation
guidelines.

Fixes below kernel-doc warnings:
- Warning: No description found for return value of 'axienet_calc_cr'
- Warning: No description found for return value of 'axienet_device_reset'
- Warning: No description found for return value of 'axienet_free_tx_chain'
- Warning: No description found for return value of 
'axienet_dim_coalesce_count_rx'

Signed-off-by: Suraj Gupta <suraj.gupta2@amd.com>
---
V2: https://lore.kernel.org/all/20250917124948.226536-1-suraj.gupta2@amd.com/

Changes in V3:
Fix other similiar kernel-doc warnings.

Changes in V2:                                                             
Drop mutex documentation patch.                                            
Add Reviewed-by tags. 
---
 drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
index ec6d47dc984a..284031fb2e2c 100644
--- a/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
+++ b/drivers/net/ethernet/xilinx/xilinx_axienet_main.c
@@ -238,6 +238,8 @@ static u64 axienet_dma_rate(struct axienet_local *lp)
  *
  * Calculate a control register value based on the coalescing settings. The
  * run/stop bit is not set.
+ *
+ * Return: Control register value with coalescing settings configured.
  */
 static u32 axienet_calc_cr(struct axienet_local *lp, u32 count, u32 usec)
 {
@@ -702,7 +704,8 @@ static void axienet_dma_stop(struct axienet_local *lp)
  * are connected to Axi Ethernet reset lines, this in turn resets the Axi
  * Ethernet core. No separate hardware reset is done for the Axi Ethernet
  * core.
- * Returns 0 on success or a negative error number otherwise.
+ *
+ * Return: 0 on success or a negative error number otherwise.
  */
 static int axienet_device_reset(struct net_device *ndev)
 {
@@ -773,7 +776,8 @@ static int axienet_device_reset(struct net_device *ndev)
  *
  * Would either be called after a successful transmit operation, or after
  * there was an error when setting up the chain.
- * Returns the number of packets handled.
+ *
+ * Return: The number of packets handled.
  */
 static int axienet_free_tx_chain(struct axienet_local *lp, u32 first_bd,
 				 int nr_bds, bool force, u32 *sizep, int budget)
@@ -2112,6 +2116,8 @@ static void axienet_update_coalesce_rx(struct axienet_local *lp, u32 cr,
 /**
  * axienet_dim_coalesce_count_rx() - RX coalesce count for DIM
  * @lp: Device private data
+ *
+ * Return: RX coalescing frame count value for DIM.
  */
 static u32 axienet_dim_coalesce_count_rx(struct axienet_local *lp)
 {
-- 
2.25.1