powerpc/mpc52xx_lpbfifo: fix all kernel-doc warnings

Fix multiple kernel-doc warnings in mpc52xx_lpbfifo.c:

arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c:377: warning: expecting prototype for mpc52xx_lpbfifo_bcom_poll(). Prototype was for mpc52xx_lpbfifo_poll() instead

mpc52xx_lpbfifo.c:221: warning: No description found for return value of 'mpc52xx_lpbfifo_irq'
mpc52xx_lpbfifo.c:327: warning: No description found for return value of 'mpc52xx_lpbfifo_bcom_irq'
mpc52xx_lpbfifo.c:398: warning: No description found for return value of 'mpc52xx_lpbfifo_submit'

mpc52xx_lpbfifo.c:64: warning: Function parameter or member 'req' not described in 'mpc52xx_lpbfifo_kick'
mpc52xx_lpbfifo.c:220: warning: contents before sections
mpc52xx_lpbfifo.c:223: warning: Function parameter or member 'irq' not described in 'mpc52xx_lpbfifo_irq'
mpc52xx_lpbfifo.c:223: warning: Function parameter or member 'dev_id' not described in 'mpc52xx_lpbfifo_irq'
mpc52xx_lpbfifo.c:328: warning: contents before sections
mpc52xx_lpbfifo.c:331: warning: Function parameter or member 'irq' not described in 'mpc52xx_lpbfifo_bcom_irq'
mpc52xx_lpbfifo.c:331: warning: Function parameter or member 'dev_id' not described in 'mpc52xx_lpbfifo_bcom_irq'
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221124061918.1967-1-rdunlap@infradead.org

arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c

@@ -59,6 +59,8 @@ static struct mpc52xx_lpbfifo lpbfifo;
 
 /**
  * mpc52xx_lpbfifo_kick - Trigger the next block of data to be transferred
+ *
+ * @req: Pointer to request structure
  */
 static void mpc52xx_lpbfifo_kick(struct mpc52xx_lpbfifo_request *req)
 {
@@ -178,6 +180,8 @@ static void mpc52xx_lpbfifo_kick(struct mpc52xx_lpbfifo_request *req)
 
 /**
  * mpc52xx_lpbfifo_irq - IRQ handler for LPB FIFO
+ * @irq: IRQ number to be handled
+ * @dev_id: device ID cookie
  *
  * On transmit, the dma completion irq triggers before the fifo completion
  * triggers.  Handle the dma completion here instead of the LPB FIFO Bestcomm
@@ -216,6 +220,8 @@ static void mpc52xx_lpbfifo_kick(struct mpc52xx_lpbfifo_request *req)
  * or nested spinlock condition.  The out path is non-trivial, so
  * extra fiddling is done to make sure all paths lead to the same
  * outbound code.
+ *
+ * Return: irqreturn code (%IRQ_HANDLED)
  */
 static irqreturn_t mpc52xx_lpbfifo_irq(int irq, void *dev_id)
 {
@@ -320,8 +326,12 @@ static irqreturn_t mpc52xx_lpbfifo_irq(int irq, void *dev_id)
 
 /**
  * mpc52xx_lpbfifo_bcom_irq - IRQ handler for LPB FIFO Bestcomm task
+ * @irq: IRQ number to be handled
+ * @dev_id: device ID cookie
  *
  * Only used when receiving data.
+ *
+ * Return: irqreturn code (%IRQ_HANDLED)
  */
 static irqreturn_t mpc52xx_lpbfifo_bcom_irq(int irq, void *dev_id)
 {
@@ -372,7 +382,7 @@ static irqreturn_t mpc52xx_lpbfifo_bcom_irq(int irq, void *dev_id)
 }
 
 /**
- * mpc52xx_lpbfifo_bcom_poll - Poll for DMA completion
+ * mpc52xx_lpbfifo_poll - Poll for DMA completion
  */
 void mpc52xx_lpbfifo_poll(void)
 {
@@ -393,6 +403,8 @@ EXPORT_SYMBOL(mpc52xx_lpbfifo_poll);
 /**
  * mpc52xx_lpbfifo_submit - Submit an LPB FIFO transfer request.
  * @req: Pointer to request structure
+ *
+ * Return: %0 on success, -errno code on error
  */
 int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req)
 {