linux-kernel - Re: [PATCH] usb: rework CONFIG_USB

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Date:	Thu, 4 Feb 2016 14:39:16 +0800
From:	Peter Chen <hzpeterchen@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Felipe Balbi <balbi@...nel.org>, Bin Liu <b-liu@...com>,
	Felipe Balbi <balbi@...com>, balbif@...il.com,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: rework CONFIG_USB_COMMON logic

On Wed, Feb 03, 2016 at 11:35:26PM +0100, Arnd Bergmann wrote:
> 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 <arnd@...db.de>
> ---
> Preliminary for now, I've added it to my patch stack for randconfig tests
> and will test it overnight to see if any build-time regressions come up.
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index e7e117d5dbbe..df005f5a0e0c 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -249,7 +249,8 @@ 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
> 

Reviewed-by: Peter Chen <peter.chen@....com>

-- 

Best Regards,
Peter Chen