clk: zynq: pll: Fix kernel-doc warnings

Fix the following kernel-doc warning

drivers/clk/zynq/pll.c:15: warning: missing initial short description on line:
 * struct zynq_pll
drivers/clk/zynq/pll.c:96: warning: No description found for return value of 'zynq_pll_is_enabled'
drivers/clk/zynq/pll.c:116: warning: No description found for return value of 'zynq_pll_enable'
drivers/clk/zynq/pll.c:187: warning: No description found for return value of 'clk_register_zynq_pll'

Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Link: https://lore.kernel.org/r/9929a56462bfdd491c43c233abc4341fc14dac1d.1637139796.git.shubhrajyoti.datta@xilinx.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: Shubhrajyoti Datta

drivers/clk/zynq/pll.c

@@ -12,7 +12,7 @@
 #include <linux/io.h>
 
 /**
- * struct zynq_pll
+ * struct zynq_pll - pll clock
  * @hw:		Handle between common and hardware-specific interfaces
  * @pll_ctrl:	PLL control register
  * @pll_status:	PLL status register
@@ -46,7 +46,7 @@ struct zynq_pll {
  * @hw:		Handle between common and hardware-specific interfaces
  * @rate:	Desired clock frequency
  * @prate:	Clock frequency of parent clock
- * Returns frequency closest to @rate the hardware can generate.
+ * Return:	frequency closest to @rate the hardware can generate.
  */
 static long zynq_pll_round_rate(struct clk_hw *hw, unsigned long rate,
 		unsigned long *prate)
@@ -66,7 +66,7 @@ static long zynq_pll_round_rate(struct clk_hw *hw, unsigned long rate,
  * zynq_pll_recalc_rate() - Recalculate clock frequency
  * @hw:			Handle between common and hardware-specific interfaces
  * @parent_rate:	Clock frequency of parent clock
- * Returns current clock frequency.
+ * Return:		current clock frequency.
  */
 static unsigned long zynq_pll_recalc_rate(struct clk_hw *hw,
 		unsigned long parent_rate)
@@ -87,7 +87,7 @@ static unsigned long zynq_pll_recalc_rate(struct clk_hw *hw,
 /**
  * zynq_pll_is_enabled - Check if a clock is enabled
  * @hw:		Handle between common and hardware-specific interfaces
- * Returns 1 if the clock is enabled, 0 otherwise.
+ * Return:	1 if the clock is enabled, 0 otherwise.
  *
  * Not sure this is a good idea, but since disabled means bypassed for
  * this clock implementation we say we are always enabled.
@@ -110,7 +110,7 @@ static int zynq_pll_is_enabled(struct clk_hw *hw)
 /**
  * zynq_pll_enable - Enable clock
  * @hw:		Handle between common and hardware-specific interfaces
- * Returns 0 on success
+ * Return: 0 on success
  */
 static int zynq_pll_enable(struct clk_hw *hw)
 {
@@ -179,7 +179,7 @@ static const struct clk_ops zynq_pll_ops = {
  * @pll_status:	Pointer to PLL status register
  * @lock_index:	Bit index to this PLL's lock status bit in @pll_status
  * @lock:	Register lock
- * Returns handle to the registered clock.
+ * Return:	handle to the registered clock.
  */
 struct clk *clk_register_zynq_pll(const char *name, const char *parent,
 		void __iomem *pll_ctrl, void __iomem *pll_status, u8 lock_index,