linux-kernel - Re: [PATCH] phy: sun9i-usb: add USB dependency

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Date:	Mon, 30 Nov 2015 20:40:54 +0800
From:	Chen-Yu Tsai <wens@...e.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Chen-Yu Tsai <wens@...e.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] phy: sun9i-usb: add USB dependency

On Mon, Nov 30, 2015 at 8:33 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Monday 30 November 2015 20:27:04 Chen-Yu Tsai wrote:
>> On Mon, Nov 30, 2015 at 7:29 PM, Arnd Bergmann <arnd@...db.de> wrote:
>> > The sun9i usb phy driver calls of_usb_get_phy_mode(), which is not
>> > available if USB is disabled:
>> >
>> > drivers/built-in.o: In function `sun9i_usb_phy_probe':
>> > :(.text+0x7fb0): undefined reference to `of_usb_get_phy_mode'
>> >
>> > This adds a dependency to avoid the randconfig build errors.
>> >
>> > Signed-off-by: Arnd Bergmann <arnd@...db.de>
>> > Fixes: 9c3b44302636 ("phy: Add driver to support individual USB PHYs on sun9i")
>> >
>> > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
>> > index 7eb5859dd035..03cb3ea2d2c0 100644
>> > --- a/drivers/phy/Kconfig
>> > +++ b/drivers/phy/Kconfig
>> > @@ -233,6 +233,7 @@ config PHY_SUN9I_USB
>> >         tristate "Allwinner sun9i SoC USB PHY driver"
>> >         depends on ARCH_SUNXI && HAS_IOMEM && OF
>> >         depends on RESET_CONTROLLER
>> > +       depends on USB_COMMON
>>
>> USB_SUPPORT seems like the one to use. Some other phy drivers depend on this,
>> and so does drivers/usb/phy/of.c, which is where of_usb_get_phy_mode()
>> is located.
>
> USB_SUPPORT is the user-selectable option that enables USB and USB_GADGET
> to be selected, while USB_COMMON is automatically enabled if one of those
> two is.
>
> If you have USB_SUPPORT=y but both USB and USB_GADGET disabled, then
> Kbuild does not enter the drivers/usb/phy directory and you still
> get the build failure.

I see why the others work with USB_SUPPORT. They select USB_PHY, so
Kbuild enters driver/usb/phy.

Thanks!

Acked-by: Chen-Yu Tsai <wens@...e.org>
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