pwm_loongson_writel
pwm_loongson_writel(ddata, val, LOONGSON_PWM_REG_CTRL);
pwm_loongson_writel(ddata, val, LOONGSON_PWM_REG_CTRL);
pwm_loongson_writel(ddata, duty, LOONGSON_PWM_REG_DUTY);
pwm_loongson_writel(ddata, period, LOONGSON_PWM_REG_PERIOD);
pwm_loongson_writel(ddata, val, LOONGSON_PWM_REG_CTRL);