linux-kernel - Re: [PATCH] usb: phy: add USB

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Date:   Wed, 14 Sep 2016 15:51:41 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Hans de Goede <hdegoede@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: phy: add USB_SUPPORT dependency

On Thursday, September 8, 2016 7:07:32 PM CEST Kishon Vijay Abraham I wrote:
> 
> On Wednesday 07 September 2016 03:01 PM, Hans de Goede wrote:
> > Hi,
> > 
> > On 06-09-16 14:54, Arnd Bergmann wrote:
> >> The driver now calls of_usb_get_dr_mode_by_phy, which is part of the
> >> USB core layer, and it fails to build when that is not provided:
> >>
> >> drivers/phy/phy-sun4i-usb.o: In function `sun4i_usb_phy_probe':
> >> phy-sun4i-usb.c:(.text.sun4i_usb_phy_probe+0x140): undefined reference to
> >> `of_usb_get_dr_mode_by_phy'
> >>
> >> We already have a couple of other PHY drivers with a dependency
> >> on USB_SUPPORT, so that seems to be the easiest fix here.
> >>
> >> An alternative would be to adjust the #ifdef in include/linux/usb/of.h
> >> to also check for CONFIG_USB_SUPPORT.
> >>
> >> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> >> Fixes: b33ecca87df9 ("phy-sun4i-usb: Add support for peripheral-only mode")
> > 
> > Good catch, patch LGTM:
> > 
> > Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> 
> merged, thanks.
> 

There is one more that came up today, with the meson usb2 phy driver.

I've now implemented the "alternative" I mentioned above, which should
avoid introducing other instances of this bug in the future.

Sorry for all the back-and-forth here,

	Arnd