static int meson_audio_arb_probe()

in reset-meson-audio-arb.c [136:192]

• 43 lines of code
• 8 McCabe index (conditional complexity)

static int meson_audio_arb_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct meson_audio_arb_match_data *data;
	struct meson_audio_arb_data *arb;
	struct resource *res;
	int ret;

	data = of_device_get_match_data(dev);
	if (!data)
		return -EINVAL;

	arb = devm_kzalloc(dev, sizeof(*arb), GFP_KERNEL);
	if (!arb)
		return -ENOMEM;
	platform_set_drvdata(pdev, arb);

	arb->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(arb->clk)) {
		if (PTR_ERR(arb->clk) != -EPROBE_DEFER)
			dev_err(dev, "failed to get clock\n");
		return PTR_ERR(arb->clk);
	}

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	arb->regs = devm_ioremap_resource(dev, res);
	if (IS_ERR(arb->regs))
		return PTR_ERR(arb->regs);

	spin_lock_init(&arb->lock);
	arb->reset_bits = data->reset_bits;
	arb->rstc.nr_resets = data->reset_num;
	arb->rstc.ops = &meson_audio_arb_rstc_ops;
	arb->rstc.of_node = dev->of_node;
	arb->rstc.owner = THIS_MODULE;

	/*
	 * Enable general :
	 * In the initial state, all memory interfaces are disabled
	 * and the general bit is on
	 */
	ret = clk_prepare_enable(arb->clk);
	if (ret) {
		dev_err(dev, "failed to enable arb clock\n");
		return ret;
	}
	writel(BIT(ARB_GENERAL_BIT), arb->regs);

	/* Register reset controller */
	ret = devm_reset_controller_register(dev, &arb->rstc);
	if (ret) {
		dev_err(dev, "failed to register arb reset controller\n");
		meson_audio_arb_remove(pdev);
	}

	return ret;
}