Re: [PATCH v2 10/10] usb: chipidea: tegra: Add USB_TEGRA_PHY module to driver's dependencies

[Michał Mirosław]

On Fri, Dec 20, 2019 at 07:31:08AM +0300, Dmitry Osipenko wrote:
> 20.12.2019 06:56, Peter Chen ÐÐÑÐÑ:
> > On 19-12-20 04:52:38, Dmitry Osipenko wrote:
[...]
> >> --- a/drivers/usb/chipidea/ci_hdrc_tegra.c
> >> +++ b/drivers/usb/chipidea/ci_hdrc_tegra.c
> >> @@ -53,6 +53,12 @@ static int tegra_udc_probe(struct platform_device *pdev)
> >>  	struct tegra_udc *udc;
> >>  	int err;
> >>  
> >> +	if (IS_MODULE(CONFIG_USB_TEGRA_PHY)) {
> >> +		err = request_module("phy_tegra_usb");
> >> +		if (err)
> >> +			return err;
> >> +	}
> >> +
> > 
> > Why you do this dependency, if this controller driver can't
> > get USB PHY, it should return error. What's the return value
> > after calling below:
> > 
> > 	udc->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "nvidia,phy", 0);
> 
> It returns -EPROBE_DEFER when phy_tegra_usb isn't loaded.

How are other driver modules autoloaded? Isn't there an appropriate
MODALIAS or MODULE_DEVICE_TABLE in there?

Best Regards,
MichaÅ MirosÅaw