linux-kernel - Re: [PATCH -next] usb: gadget: Add dependency for USB_TEGRA

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Message-ID: <51315499-99d0-eca3-a7df-b8dd84628bbd@huawei.com>
Date:   Mon, 4 Nov 2019 18:50:01 +0800
From:   maowenan <maowenan@...wei.com>
To:     Thierry Reding <treding@...dia.com>
CC:     <felipe.balbi@...ux.intel.com>, <gregkh@...uxfoundation.org>,
        <nkristam@...dia.com>, <arnd@...db.de>, <johan@...nel.org>,
        <krzk@...nel.org>, <linux-usb@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH -next] usb: gadget: Add dependency for USB_TEGRA_XUDC



On 2019/11/4 18:04, Thierry Reding wrote:
> On Mon, Nov 04, 2019 at 10:59:45AM +0800, Mao Wenan wrote:
>> If CONFIG_USB_TEGRA_XUDC=y and CONFIG_USB_ROLE_SWITCH=m,
>> below erros can be seen:
>> drivers/usb/gadget/udc/tegra-xudc.o: In function `tegra_xudc_remove':
>> tegra-xudc.c:(.text+0x6b0): undefined reference to `usb_role_switch_unregister'
>> drivers/usb/gadget/udc/tegra-xudc.o: In function `tegra_xudc_probe':
>> tegra-xudc.c:(.text+0x1b88): undefined reference to `usb_role_switch_register'
>> drivers/usb/gadget/udc/tegra-xudc.o: In function `tegra_xudc_usb_role_sw_work':
>> tegra-xudc.c:(.text+0x5ecc): undefined reference to `usb_role_switch_get_role'
>>
>> This patch add dependency USB_ROLE_SWITCH for UDC driver.
>>
>> Fixes: 49db427232fe ("usb: gadget: Add UDC driver for tegra XUSB device mode controller")
>> Signed-off-by: Mao Wenan <maowenan@...wei.com>
>> ---
>>  drivers/usb/gadget/udc/Kconfig | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
>> index acaec3a..d103154 100644
>> --- a/drivers/usb/gadget/udc/Kconfig
>> +++ b/drivers/usb/gadget/udc/Kconfig
>> @@ -445,6 +445,7 @@ config USB_TEGRA_XUDC
>>  	tristate "NVIDIA Tegra Superspeed USB 3.0 Device Controller"
>>  	depends on ARCH_TEGRA || COMPILE_TEST
>>  	depends on PHY_TEGRA_XUSB
>> +	depends on USB_ROLE_SWITCH
> 
> It looks like most other drivers that use the USB role switch class do
> "select" here. Now, that's suboptimal because USB_ROLE_SWITCH is a user-
> visible symbol, which can lead to conflicts, so it should be avoided. I
> think that in this case it might make sense to hide USB_ROLE_SWITCH and
> then convert all "depends on USB_ROLE_SWITCH" occurrences to "select
> USB_ROLE_SWITCH". The USB role switch class is, after all, not useful by
> itself. It always needs a host and/or gadget driver to make use of it.
> 

Thanks, I send v2 and change 'depends on' to 'select' for this patch.

> Thierry
>