TIM_CCRx
ret = regmap_read(priv->regmap, TIM_CCRx(ch + 1), &wfhw->ccr);
ret = regmap_write(priv->regmap, TIM_CCRx(ch + 1), wfhw->ccr);
#define TIM_CCR1 TIM_CCRx(1) /* Capt/Comp Register 1 */
#define TIM_CCR2 TIM_CCRx(2) /* Capt/Comp Register 2 */
#define TIM_CCR3 TIM_CCRx(3) /* Capt/Comp Register 3 */
#define TIM_CCR4 TIM_CCRx(4) /* Capt/Comp Register 4 */