LOONGSON_PWM_CTRL_REG_INVERT
state->polarity = (ctrl & LOONGSON_PWM_CTRL_REG_INVERT) ? PWM_POLARITY_INVERSED :
val |= LOONGSON_PWM_CTRL_REG_INVERT;
val &= ~LOONGSON_PWM_CTRL_REG_INVERT;