Re: [PATCH v3] usb: phy: add R-Car USB phy driver

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Hi Sergei

> >>>> 0xAAAA0000  ===========
> >>>>                  EHCI
> >>>>               ----------
> >>>> 0xAAAA0094     PHY
> >>>> 0xAAAA009C     PHY
> >>>>               ----------
> >>>>                  EHCI
> >>>> 0xAAAA0400  ==========
> >>>> ...
> >>>> 0xAAAA0800  ----------
> >>>>                  PHY
> >>>> 0xAAAA0900  ----------
> 
> >>>> This driver couldn't probe if it used "request_mem_region()"
> 
> >>> Fair enough. I must say, though. That's a peculiar register mapping ;-)
> 
> >>      Not peculiar enough to not be able to overcome it. Those registers
> >> at 0xAAAA009[4C]
> >> are not really PHY related, they control EHCI internal buffering. They
> >> probably shouldn't
> >> have been a part of this driver even...
> 
> > I'm not sure what is the best solution.
> 
>     I suspect that these registers should be intialized as a part of 
> ehci-platform driver's power_on() platform callback.

I had same opinion before, and of course I agree your opinion.
But, not in power_on() callback.
I guess you need to create new callback (for init), 
since power_on() and ioremap() timing

      	if (pdata->power_on) {
		err = pdata->power_on(dev);
		if (err < 0)
			return err;
	}
        ...
	hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
	if (IS_ERR(hcd->regs)) {
		err = PTR_ERR(hcd->regs);
		goto err_put_hcd;
	}

        # init() here ?
      	if (pdata->init)
		err = pdata->init(dev, hcd->regs);


Best regards
---
Kuninori Morimoto
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