Re: [PATCH 2/2] usb: dwc3: Add driver for Xilinx platforms

[Chunfeng Yun]

On Thu, 2020-08-27 at 00:14 +0530, Manish Narani wrote:
> Add a new driver for supporting Xilinx platforms. This driver handles
> the USB 3.0 PHY initialization and PIPE control & reset operations for
> ZynqMP platforms. This also handles the USB 2.0 PHY initialization and
> reset operations for Versal platforms.
> 
> Signed-off-by: Manish Narani <manish.narani@xxxxxxxxxx>
> ---
>  drivers/usb/dwc3/Kconfig          |   8 +
>  drivers/usb/dwc3/Makefile         |   1 +
>  drivers/usb/dwc3/dwc3-of-simple.c |   1 -
>  drivers/usb/dwc3/dwc3-xilinx.c    | 416 ++++++++++++++++++++++++++++++
>  4 files changed, 425 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/usb/dwc3/dwc3-xilinx.c
> 
[...]
> +static int dwc3_xlnx_probe(struct platform_device *pdev)
> +{
> +	struct dwc3_xlnx	*priv_data;
> +	struct device		*dev = &pdev->dev;
> +	struct device_node	*np = dev->of_node;
> +	struct resource		*res;
> +	void __iomem		*regs;
> +	int			ret;
> +
> +	priv_data = devm_kzalloc(dev, sizeof(*priv_data), GFP_KERNEL);
> +	if (!priv_data)
> +		return -ENOMEM;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
> +		dev_err(dev, "missing memory resource\n");
> +		return -ENODEV;
> +	}
> +
> +	regs = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(regs))
> +		return PTR_ERR(regs);
Use devm_platform_ioremap_resource()?

> +
> +	/* Store the usb control regs into priv_data for further usage */
> +	priv_data->regs = regs;
> +
> +	priv_data->dev = dev;
> +
> +	platform_set_drvdata(pdev, priv_data);
> +
> +	ret = clk_bulk_get_all(priv_data->dev, &priv_data->clks);
> +	if (ret < 0)
> +		return ret;
> +
> +	priv_data->num_clocks = ret;
> +
> +	ret = clk_bulk_prepare_enable(priv_data->num_clocks, priv_data->clks);
> +	if (ret)
> +		return ret;
> +
> +	if (of_device_is_compatible(pdev->dev.of_node, "xlnx,zynqmp-dwc3")) {
> +		ret = dwc3_xlnx_init_zynqmp(priv_data);
> +		if (ret)
> +			goto err_clk_put;
> +	}
> +
> +	if (of_device_is_compatible(pdev->dev.of_node, "xlnx,versal-dwc3")) {
> +		ret = dwc3_xlnx_init_versal(priv_data);
> +		if (ret)
> +			goto err_clk_put;
> +	}
> +
> +	ret = of_platform_populate(np, NULL, NULL, dev);
> +	if (ret)
> +		goto err_clk_put;
> +
> +	pm_runtime_set_active(dev);
> +	pm_runtime_enable(dev);
> +	pm_suspend_ignore_children(dev, false);
> +	pm_runtime_get_sync(dev);
> +
> +	pm_runtime_forbid(dev);
> +
> +	return 0;
> +
> +err_clk_put:
> +	clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);
> +	clk_bulk_put_all(priv_data->num_clocks, priv_data->clks);
> +
> +	return ret;
> +}
> +
> +static int dwc3_xlnx_remove(struct platform_device *pdev)
> +{
> +	struct dwc3_xlnx	*priv_data = platform_get_drvdata(pdev);
> +	struct device		*dev = &pdev->dev;
> +
> +	of_platform_depopulate(dev);
> +
> +	clk_bulk_disable_unprepare(priv_data->num_clocks, priv_data->clks);
> +	clk_bulk_put_all(priv_data->num_clocks, priv_data->clks);
> +	priv_data->num_clocks = 0;
> +
> +	pm_runtime_disable(dev);
> +	pm_runtime_put_noidle(dev);
> +	pm_runtime_set_suspended(dev);
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM
> +static int dwc3_xlnx_runtime_suspend(struct device *dev)
> +{
> +	struct dwc3_xlnx	*priv_data = dev_get_drvdata(dev);
> +
> +	clk_bulk_disable(priv_data->num_clocks, priv_data->clks);
> +
> +	return 0;
> +}
> +
> +static int dwc3_xlnx_runtime_idle(struct device *dev)
> +{
> +	pm_runtime_mark_last_busy(dev);
> +	pm_runtime_autosuspend(dev);
> +
> +	return 0;
> +}
> +
> +static int dwc3_xlnx_runtime_resume(struct device *dev)
> +{
> +	struct dwc3_xlnx	*priv_data = dev_get_drvdata(dev);
> +
> +	return clk_bulk_enable(priv_data->num_clocks, priv_data->clks);
> +}
> +#endif /* CONFIG_PM */
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int dwc3_xlnx_suspend(struct device *dev)
> +{
> +	struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);
> +
> +	/* Disable the clocks */
> +	clk_bulk_disable(priv_data->num_clocks, priv_data->clks);
> +
> +	return 0;
> +}
> +
> +static int dwc3_xlnx_resume(struct device *dev)
> +{
> +	struct dwc3_xlnx *priv_data = dev_get_drvdata(dev);
> +
> +	return clk_bulk_enable(priv_data->num_clocks, priv_data->clks);
> +}
> +#endif /* CONFIG_PM_SLEEP */
> +
> +static const struct dev_pm_ops dwc3_xlnx_dev_pm_ops = {
> +	SET_SYSTEM_SLEEP_PM_OPS(dwc3_xlnx_suspend, dwc3_xlnx_resume)
> +	SET_RUNTIME_PM_OPS(dwc3_xlnx_runtime_suspend, dwc3_xlnx_runtime_resume,
> +			   dwc3_xlnx_runtime_idle)
> +};
> +
> +static const struct of_device_id of_dwc3_xlnx_match[] = {
> +	{ .compatible = "xlnx,zynqmp-dwc3" },
> +	{ .compatible = "xlnx,versal-dwc3" },
> +	{ /* Sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, of_dwc3_xlnx_match);
> +
> +static struct platform_driver dwc3_xlnx_driver = {
> +	.probe		= dwc3_xlnx_probe,
> +	.remove		= dwc3_xlnx_remove,
> +	.driver		= {
> +		.name	= "dwc3-xilinx",
> +		.of_match_table = of_dwc3_xlnx_match,
> +		.pm	= &dwc3_xlnx_dev_pm_ops,
> +	},
> +};
> +
> +module_platform_driver(dwc3_xlnx_driver);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("Xilinx DWC3 controller specific glue driver");
> +MODULE_AUTHOR("Anurag Kumar Vulisha <anurag.kumar.vulisha@xxxxxxxxxx>");
> +MODULE_AUTHOR("Manish Narani <manish.narani@xxxxxxxxxx>");