RE: [PATCH v2 3/5] usb: dwc2: Add generic PHY framework support for dwc2 usb controler platform driver.

[Paul Zimmerman]

> From: Yunzhi Li [mailto:lyz@xxxxxxxxxxxxxx]
> Sent: Sunday, December 07, 2014 7:58 PM
> 
> On 2014/12/6 3:04, Paul Zimmerman wrote:
> >> From: Yunzhi Li [mailto:lyz@xxxxxxxxxxxxxx]
> >> Sent: Friday, December 05, 2014 4:52 AM
> >>
> >> Get PHY parameters from devicetree and power off usb PHY during
> >> system suspend.
> >>
> >> Signed-off-by: Yunzhi Li <lyz@xxxxxxxxxxxxxx>
> >> ---
> >>
> >>   drivers/usb/dwc2/gadget.c   | 33 ++++++++++++---------------------
> >>   drivers/usb/dwc2/platform.c | 34 ++++++++++++++++++++++++++++++++++
> >>   2 files changed, 46 insertions(+), 21 deletions(-)
> >>
> >> diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c
> >> index 200168e..2601c61 100644
> >> --- a/drivers/usb/dwc2/gadget.c
> >> +++ b/drivers/usb/dwc2/gadget.c
> >> [...]
> >>
> >>   	/*
> >> -	 * Attempt to find a generic PHY, then look for an old style
> >> -	 * USB PHY, finally fall back to pdata
> >> +	 * If platform probe couldn't find a generic PHY or an old style
> >> +	 * USB PHY, fall back to pdata
> >>   	 */
> >> -	phy = devm_phy_get(dev, "usb2-phy");
> >> -	if (IS_ERR(phy)) {
> >> -		uphy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB2);
> >> -		if (IS_ERR(uphy)) {
> >> -			/* Fallback for pdata */
> >> -			plat = dev_get_platdata(dev);
> >> -			if (!plat) {
> >> -				dev_err(dev,
> >> -				"no platform data or transceiver defined\n");
> >> -				return -EPROBE_DEFER;
> >> -			}
> >> -			hsotg->plat = plat;
> >> -		} else
> >> -			hsotg->uphy = uphy;
> >> -	} else {
> >> -		hsotg->phy = phy;
> >> +	if (IS_ERR_OR_NULL(hsotg->phy) && IS_ERR_OR_NULL(hsotg->uphy)) {
> >> +		plat = dev_get_platdata(dev);
> >> +		if (!plat) {
> >> +			dev_err(dev,
> >> +			"no platform data or transceiver defined\n");
> >> +			return -EPROBE_DEFER;
> >> +		}
> >> +		hsotg->plat = plat;
> >> +	} else if (hsotg->phy) {
> > You have changed the behavior here. Previously, the driver would work
> > even if there were no phys or pdata defined. Now it will return
> > -EPROBE_DEFER instead. Are you sure that won't break any existing
> > platforms?
> >
> I don't really catch your meaning. Could you please point out where is
> the difference? Thanks .

Yeah, sorry, I misread the patch. I think your new version is fine.

-- 
Paul

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/