linux-kernel - RE: [PATCHv5 7/7] usb: dwc2: Update Kconfig to support dual-role

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Message-ID: <A2CA0424C0A6F04399FB9E1CD98E0304844E4EEC@US01WEMBX2.internal.synopsys.com>
Date:	Wed, 22 Oct 2014 18:45:08 +0000
From:	Paul Zimmerman <Paul.Zimmerman@...opsys.com>
To:	Dinh Nguyen <dinguyen@...nsource.altera.com>,
	Paul Bolle <pebolle@...cali.nl>
CC:	"balbi@...com" <balbi@...com>,
	"dinh.linux@...il.com" <dinh.linux@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"b.zolnierkie@...sung.com" <b.zolnierkie@...sung.com>,
	"matthijs@...in.nl" <matthijs@...in.nl>,
	"r.baldyga@...sung.com" <r.baldyga@...sung.com>,
	"jg1.han@...sung.com" <jg1.han@...sung.com>,
	"sachin.kamat@...aro.org" <sachin.kamat@...aro.org>,
	"ben-linux@...ff.org" <ben-linux@...ff.org>,
	"dianders@...omium.org" <dianders@...omium.org>,
	"kever.yang@...k-chips.com" <kever.yang@...k-chips.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCHv5 7/7] usb: dwc2: Update Kconfig to support dual-role

> From: Dinh Nguyen [mailto:dinguyen@...nsource.altera.com]
> Sent: Tuesday, October 21, 2014 1:48 PM
>
> diff --git a/drivers/usb/dwc2/Kconfig b/drivers/usb/dwc2/Kconfig
> index f93807b..1ea702e 100644
> --- a/drivers/usb/dwc2/Kconfig
> +++ b/drivers/usb/dwc2/Kconfig
> @@ -1,5 +1,5 @@
>  config USB_DWC2
> -	bool "DesignWare USB2 DRD Core Support"
> +	tristate "DesignWare USB2 DRD Core Support"
>  	depends on USB
>  	help
>  	  Say Y here if your system has a Dual Role Hi-Speed USB
> @@ -10,31 +10,53 @@ config USB_DWC2
>  	  bus interface module (if you have a PCI bus system) will be
>  	  called dwc2_pci.ko, and the platform interface module (for
>  	  controllers directly connected to the CPU) will be called
> -	  dwc2_platform.ko. For gadget mode, there will be a single
> -	  module called dwc2_gadget.ko.
> -
> -	  NOTE: The s3c-hsotg driver is now renamed to dwc2_gadget. The
> -	  host and gadget drivers are still currently separate drivers.
> -	  There are plans to merge the dwc2_gadget driver with the dwc2
> -	  host driver in the near future to create a dual-role driver.
> +	  dwc2_platform.ko. For all modes(host, gadget and dual-role), there
> +	  will be a single module called dwc2.ko.

Maybe "For all modes (host, gadget and dual-role), there will be an
additional module named dwc2.ko." That would be clearer.

>  if USB_DWC2
>  
> +choice
> +	bool "DWC2 Mode Selection"
> +	default USB_DWC2_DUAL_ROLE if (USB && USB_GADGET)
> +	default USB_DWC2_HOST if (USB && !USB_GADGET)
> +	default USB_DWC2_PERIPHERAL if (!USB && USB_GADGET)
> +
>  config USB_DWC2_HOST
> -	tristate "Host only mode"
> +	bool "Host only mode"
>  	depends on USB
>  	help
>  	  The Designware USB2.0 high-speed host controller
> -	  integrated into many SoCs.
> +	  integrated into many SoCs. Select this option if you want the
> +	  driver to operate in Host-only mode.
> +
> +comment "Gadget/Dual-role mode requires USB Gadget support to be enabled"
> +
> +config USB_DWC2_PERIPHERAL
> +	bool "Gadget only mode"
> +	depends on USB_GADGET=y || USB_GADGET=USB_DWC2
> +	help
> +	  The Designware USB2.0 high-speed gadget controller
> +	  integrated into many SoCs. Select this option if you want the
> +	  driver to operate in Peripheral-only mode. This option requires
> +	  USB_GADGET=y.

Shouldn't this be "This option requires USB_GADGET to be enabled"? It
doesn't have to be built-in.

> +config USB_DWC2_DUAL_ROLE
> +	bool "Dual Role mode"
> +	depends on (USB=y || USB=USB_DWC2) && (USB_GADGET=y || USB_GADGET=USB_DWC2)
> +	help
> +	  Select this option if you want the driver to work in a dual-role
> +	  mode. In this mode both host and gadget features are enabled, and
> +	  the role will be determined by the cable that gets plugged-in. This
> +	  option requires USB_GADGET=y.

Ditto.

Once you fix these, plus the extraneous "default y" that Paul Bolle
pointed out, you can add my acked-by.

-- 
Paul