static int rzg2l_wdt_probe()

in rzg2l_wdt.c [164:244]

• 63 lines of code
• 11 McCabe index (conditional complexity)

static int rzg2l_wdt_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct rzg2l_wdt_priv *priv;
	unsigned long pclk_rate;
	struct clk *wdt_clk;
	int ret;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(priv->base))
		return PTR_ERR(priv->base);

	/* Get watchdog main clock */
	wdt_clk = clk_get(&pdev->dev, "oscclk");
	if (IS_ERR(wdt_clk))
		return dev_err_probe(&pdev->dev, PTR_ERR(wdt_clk), "no oscclk");

	priv->osc_clk_rate = clk_get_rate(wdt_clk);
	clk_put(wdt_clk);
	if (!priv->osc_clk_rate)
		return dev_err_probe(&pdev->dev, -EINVAL, "oscclk rate is 0");

	/* Get Peripheral clock */
	wdt_clk = clk_get(&pdev->dev, "pclk");
	if (IS_ERR(wdt_clk))
		return dev_err_probe(&pdev->dev, PTR_ERR(wdt_clk), "no pclk");

	pclk_rate = clk_get_rate(wdt_clk);
	clk_put(wdt_clk);
	if (!pclk_rate)
		return dev_err_probe(&pdev->dev, -EINVAL, "pclk rate is 0");

	priv->delay = F2CYCLE_NSEC(priv->osc_clk_rate) * 6 + F2CYCLE_NSEC(pclk_rate) * 9;

	priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
	if (IS_ERR(priv->rstc))
		return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc),
				     "failed to get cpg reset");

	reset_control_deassert(priv->rstc);
	pm_runtime_enable(&pdev->dev);
	ret = pm_runtime_resume_and_get(&pdev->dev);
	if (ret < 0) {
		dev_err(dev, "pm_runtime_resume_and_get failed ret=%pe", ERR_PTR(ret));
		goto out_pm_get;
	}

	priv->wdev.info = &rzg2l_wdt_ident;
	priv->wdev.ops = &rzg2l_wdt_ops;
	priv->wdev.parent = dev;
	priv->wdev.min_timeout = 1;
	priv->wdev.max_timeout = rzg2l_wdt_get_cycle_usec(priv->osc_clk_rate, 0xfff) /
				 USEC_PER_SEC;
	priv->wdev.timeout = WDT_DEFAULT_TIMEOUT;

	watchdog_set_drvdata(&priv->wdev, priv);
	ret = devm_add_action_or_reset(&pdev->dev,
				       rzg2l_wdt_reset_assert_pm_disable_put,
				       &priv->wdev);
	if (ret < 0)
		return ret;

	watchdog_set_nowayout(&priv->wdev, nowayout);
	watchdog_stop_on_unregister(&priv->wdev);

	ret = watchdog_init_timeout(&priv->wdev, 0, dev);
	if (ret)
		dev_warn(dev, "Specified timeout invalid, using default");

	return devm_watchdog_register_device(&pdev->dev, &priv->wdev);

out_pm_get:
	pm_runtime_disable(dev);
	reset_control_assert(priv->rstc);

	return ret;
}