linux-imx

    u64 tmp;

    int ret;

​

    ret = pwm_imx27_clk_prepare_enable(chip);

    if (ret < 0)

        return;

​

    val = readl(imx->mmio_base + MX3_PWMCR);

​

        state->enabled = true;

        state->enabled = false;

​

    switch (FIELD_GET(MX3_PWMCR_POUTC, val)) {

    case MX3_PWMCR_POUTC_NORMAL:

        state->polarity = PWM_POLARITY_NORMAL;

        break;

    case MX3_PWMCR_POUTC_INVERTED:

        state->polarity = PWM_POLARITY_INVERSED;

        break;

    default:

        dev_warn(chip->dev, "can't set polarity, output disconnected");

    /* PWMSAR can be read only if PWM is enabled */

    if (state->enabled) {

        val = readl(imx->mmio_base + MX3_PWMSAR);

        tmp = NSEC_PER_SEC * (u64)(val);

        state->duty_cycle = DIV_ROUND_CLOSEST_ULL(tmp, pwm_clk);

    } else {

        state->duty_cycle = 0;

    }

​

}

​

static void pwm_imx27_sw_reset(struct pwm_chip *chip)

{

    struct pwm_imx27_chip *imx = to_pwm_imx27_chip(chip);

    struct device *dev = chip->dev;

    int wait_count = 0;

    u32 cr;

​

    writel(MX3_PWMCR_SWR, imx->mmio_base + MX3_PWMCR);