pwm: sun4i: Prefer "mod" clock to unnamed

	if (IS_ERR(pwm->base))

		return PTR_ERR(pwm->base);

	/*

	 * All hardware variants need a source clock that is divided and

	 * then feeds the counter that defines the output wave form. In the

	 * device tree this clock is either unnamed or called "mod".

	 * Some variants (e.g. H6) need another clock to access the

	 * hardware registers; this is called "bus".

	 * So we request "mod" first (and ignore the corner case that a

	 * parent provides a "mod" clock while the right one would be the

	 * unnamed one of the PWM device) and if this is not found we fall

	 * back to the first clock of the PWM.

	 */

	pwm->clk = devm_clk_get_optional(&pdev->dev, "mod");

	if (IS_ERR(pwm->clk)) {

		if (PTR_ERR(pwm->rst) != -EPROBE_DEFER)

			dev_err(&pdev->dev, "get mod clock failed %pe\n",

				pwm->clk);

		return PTR_ERR(pwm->clk);

	}

	if (!pwm->clk) {

		pwm->clk = devm_clk_get(&pdev->dev, NULL);

	if (IS_ERR(pwm->clk))

		if (IS_ERR(pwm->clk)) {

			if (PTR_ERR(pwm->rst) != -EPROBE_DEFER)

				dev_err(&pdev->dev, "get unnamed clock failed %pe\n",

					pwm->clk);

			return PTR_ERR(pwm->clk);

		}

	}

	pwm->rst = devm_reset_control_get_optional_shared(&pdev->dev, NULL);

	if (IS_ERR(pwm->rst)) {