Re: [PATCH] usb: dwc3: host: inherit dma configuration from parent dev

[Arnd Bergmann]

On Thursday, September 8, 2016 3:02:56 PM CEST Grygorii Strashko wrote:
> dwc3: probe()
>         if (!&pdev->dev->of_node)
>                  legacy case - hard-code DMA props
>                 dwc->sysdev = &pdev->dev;

The PCI case will fall into this too, as we almost never have an
->of_node pointer for a PCI device.

Do we actually have any legacy dwc3 users in Linux that are neither DT
nor PCI based? Maybe we can just skip that.

>         else
>                 dev = &pdev->dev;
>                 do {
>                         if (is_device_dma_capable(dev)) {
>                                 dwc->sysdev = dev;
>                                 break;
>                         }
>                    dev = dev->parent;
>                 while (dev);
>                 ^this cycle can be limited in depth (2 for PCI)

Right, this could work by itself and looks generic enough.

	Arnd