linux-kernel - Re: [PATCH v2 4/4] usb: host: ehci-tegra: Remove USB

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Date:   Tue, 19 Dec 2017 12:52:11 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Dmitry Osipenko <digetx@...il.com>
cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        <linux-usb@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] usb: host: ehci-tegra: Remove USB_PHY dependencies
 from Kconfig

On Sun, 17 Dec 2017, Dmitry Osipenko wrote:

> Previously tegra-phy driver was built only when ehci-tegra was, now
> tegra-phy has its own Kconfig entry. Remove the USB_PHY dependencies
> from ehci-tegra's Kconfig since they aren't useful anymore.

Are you sure they aren't useful?  Does this mean it is now
possible/useful to configure a kernel with USB_EHCI_TEGRA enabled and
USB_PHY disabled?

> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
> ---
>  drivers/usb/host/Kconfig | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> index 6150bed7cfa8..5042e72c1b76 100644
> --- a/drivers/usb/host/Kconfig
> +++ b/drivers/usb/host/Kconfig
> @@ -234,9 +234,6 @@ config USB_EHCI_TEGRA
>         tristate "NVIDIA Tegra HCD support"
>         depends on ARCH_TEGRA
>         select USB_EHCI_ROOT_HUB_TT
> -       select USB_PHY
> -	select USB_ULPI
> -	select USB_ULPI_VIEWPORT

Maybe you should add

	select USB_TEGRA_PHY

here.  Also, what happened to USB_ULPI_VIEWPORT?  Is it still 
important?  If not, then what changed?

Alan Stern

>         help
>           This driver enables support for the internal USB Host Controllers
>           found in NVIDIA Tegra SoCs. The controllers are EHCI compliant.
>