pwm: samsung: Document new member .channel in struct samsung_pwm_chip

My earlier commit reworking how driver data is tracked added a new
member to struct samsung_pwm_chip but failed to add matching
documentation. Make up leeway.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
Fixes: 4c9548d ("pwm: samsung: Put per-channel data into driver data")
Signed-off-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>

Author: Uwe Kleine-König

drivers/pwm/pwm-samsung.c

@@ -77,6 +77,7 @@ struct samsung_pwm_channel {
  * @base_clk:		base clock used to drive the timers
  * @tclk0:		external clock 0 (can be ERR_PTR if not present)
  * @tclk1:		external clock 1 (can be ERR_PTR if not present)
+ * @channel:		per channel driver data
  */
 struct samsung_pwm_chip {
 	struct pwm_chip chip;