On Tue, Sep 13, 2016 at 09:04:08AM +0200, Arnd Bergmann wrote:
> On Tuesday, September 13, 2016 9:48:55 AM CEST Peter Chen wrote:
> > On Mon, Sep 12, 2016 at 05:36:23PM +0200, Arnd Bergmann wrote:
> > > Moving the CONFIG_USB_ULPI_BUS option to the top-level Kconfig file
> > > means that we can enable it without any of the other USB support,
> > > leading to a build error because Kbuild never enters the
> > > drivers/usb/common/ directory without CONFIG_USB_COMMON:
> > >
> > > ERROR: "ulpi_unregister_driver" [drivers/phy/phy-tusb1210.ko] undefined!
> > > ERROR: "__ulpi_register_driver" [drivers/phy/phy-tusb1210.ko] undefined!
> > > ERROR: "ulpi_write" [drivers/phy/phy-tusb1210.ko] undefined!
> > >
> >
> > Thanks, Arnd. I have submitted the fix.
> >
> > https://git.kernel.org/cgit/linux/kernel/git/gregkh/usb.git/commit/?h=usb-next&id=6406c3d226374c28d452b11db3b5ac241ce26191
>
> I see you used 'depends on USB_COMMON' though instead of 'select USB_COMMON'.
>
> This seems inconsistent with how we handle the other places after the patch
> I did earlier this year [see below].
>
> It probably works fine for now, but having a mix of 'depends on' and 'select'
> can be confusing for users as well as create dependency loops that break
> the build.
>
> Arnd
I just see below Kconfig entry at the same Kconfig
(drivers/usb/Kconfig), and forget your changes.
config USB_LED_TRIG
bool "USB LED Triggers"
depends on LEDS_CLASS && USB_COMMON && LEDS_TRIGGERS
help
This option adds LED triggers for USB host and/or gadget activity.
Say Y here if you are working on a system with led-class supported
LEDs and you want to use them as activity indicators for USB host or
gadget.
Just grep it, some Kconfig still uses depends on for USB_COMMON, let me
change it together.
b29397@b29397-desktop:~/work/projects/usb$ find . -name Kconfig | xargs
grep -nr "USB_COMMON"
./drivers/phy/Kconfig:274: select USB_COMMON
./drivers/usb/phy/Kconfig:72: select USB_COMMON
./drivers/usb/Kconfig:32:config USB_COMMON
./drivers/usb/Kconfig:42: select USB_COMMON
./drivers/usb/Kconfig:155: depends on LEDS_CLASS && USB_COMMON &&
LEDS_TRIGGERS
./drivers/usb/gadget/Kconfig:18: select USB_COMMON
./drivers/usb/usbip/Kconfig:3: depends on USB_COMMON && NET
Peter
>
> commit badf6d47f8a93098c6e05fdeb735b44b61877451
> Author: Arnd Bergmann <[email protected]>
> Date: Wed Mar 23 17:45:08 2016 +0100
>
> usb: common: rework CONFIG_USB_COMMON logic
>
> The phy-am335x driver selects 'USB_COMMON', but all other drivers
> use 'depends on' for that symbol, and it depends on USB || USB_GADGET
> itself, which causes a Kconfig warning:
>
> warning: (AM335X_PHY_USB) selects USB_COMMON which has unmet direct
> dependencies (USB_SUPPORT && (USB || USB_GADGET))
>
> As suggested by Felipe Balbi, this turns the logic around, and makes
> 'USB_COMMON' selected by everything else that needs it, so we can
> remove the dependencies.
>
> Fixes: 59f042f644c5 ("usb: phy: phy-am335x: bypass first VBUS sensing for
> host-only mode")
> Signed-off-by: Arnd Bergmann <[email protected]>
> Acked-by: Felipe Balbi <[email protected]>
> Reviewed-by: Peter Chen <[email protected]>
> Signed-off-by: Felipe Balbi <[email protected]>
>
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 26566db09de0..e92b97cd6056 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -250,7 +250,8 @@ 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
> + depends on USB_SUPPORT
> + select USB_COMMON
> select GENERIC_PHY
> help
> Enable this to support the transceiver that is part of Allwinner
> diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
> index 8ed451dd651e..8689dcba5201 100644
> --- a/drivers/usb/Kconfig
> +++ b/drivers/usb/Kconfig
> @@ -31,8 +31,6 @@ if USB_SUPPORT
>
> config USB_COMMON
> tristate
> - default y
> - depends on USB || USB_GADGET
>
> config USB_ARCH_HAS_HCD
> def_bool y
> @@ -41,6 +39,7 @@ config USB_ARCH_HAS_HCD
> config USB
> tristate "Support for Host-side USB"
> depends on USB_ARCH_HAS_HCD
> + select USB_COMMON
> select NLS # for UTF-8 strings
> ---help---
> Universal Serial Bus (USB) is a specification for a serial bus
> diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
> index af5d922a8f5d..2057add439f0 100644
> --- a/drivers/usb/gadget/Kconfig
> +++ b/drivers/usb/gadget/Kconfig
> @@ -15,6 +15,7 @@
>
> menuconfig USB_GADGET
> tristate "USB Gadget Support"
> + select USB_COMMON
> select NLS
> help
> USB is a master/slave protocol, organized with one master
>
--
Best Regards,
Peter Chen
