linux-kernel - Re: [PATCH v1 2/2] usb: chipidea: tegra: Select Tegra's PHY in Kconfig

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Date:   Mon, 11 Dec 2017 16:09:44 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Peter Chen <Peter.Chen@....com>, linux-usb@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] usb: chipidea: tegra: Select Tegra's PHY in
 Kconfig

On 11.12.2017 13:04, Thierry Reding wrote:
> On Mon, Dec 11, 2017 at 02:10:00AM +0300, Dmitry Osipenko wrote:
>> UDC driver won't probe without Tegra's PHY, hence select it in the
>> Kconfig.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
>>  drivers/usb/chipidea/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
>> index 785f0ed037f7..2ef3b27ea72b 100644
>> --- a/drivers/usb/chipidea/Kconfig
>> +++ b/drivers/usb/chipidea/Kconfig
>> @@ -27,6 +27,7 @@ config USB_CHIPIDEA_PCI
>>  config USB_CHIPIDEA_UDC
>>  	bool "ChipIdea device controller"
>>  	depends on USB_GADGET
>> +	select USB_TEGRA_PHY if ARCH_TEGRA
> 
> This is kind of pointless given that USB_TEGRA_PHY originally was
> automatically enabled if ARCH_TEGRA was enabled.

Again, please take a closer look at the patches. USB_TEGRA_PHY was enabled if
USB_EHCI_TEGRA was and not ARCH_TEGRA.

> What do we gain by these two patches, other than maybe make the driver
> buildable as a module?

Firstly, tegra-phy is built only if ehci-tegra is built.

Secondly, I think we need to enforce Tegra PHY to be compiled as built-in if one
of ehci-tegra or chipidea drivers is built-in and the other is compiled as a module.