linux-kernel - Re: [Patch V8 7/8] usb: gadget: Add UDC driver for tegra XUSB device mode controller

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Message-ID: <7f24dbd0-e556-20c1-7aeb-5ddbdbe0349c@nvidia.com>
Date:   Fri, 6 Sep 2019 16:01:53 +0530
From:   Nagarjuna Kristam <nkristam@...dia.com>
To:     Chunfeng Yun <chunfeng.yun@...iatek.com>
CC:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>,
        <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <mark.rutland@....com>, <robh+dt@...nel.org>, <kishon@...com>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [Patch V8 7/8] usb: gadget: Add UDC driver for tegra XUSB device
 mode controller



On 06-09-2019 07:13, Chunfeng Yun wrote:
> On Thu, 2019-09-05 at 09:57 +0530, Nagarjuna Kristam wrote:
>>
>> On 04-09-2019 16:00, Chunfeng Yun wrote:
>>> On Wed, 2019-09-04 at 13:53 +0530, Nagarjuna Kristam wrote:
>>>> This patch adds UDC driver for tegra XUSB 3.0 device mode controller.
>>>> XUSB device mode controller supports SS, HS and FS modes
>>>>
>>>> Based on work by:
>>>>   Mark Kuo <mkuo@...dia.com>
>>>>   Hui Fu <hfu@...dia.com>
>>>>   Andrew Bresticker <abrestic@...omium.org>
>>>>
>>>> Signed-off-by: Nagarjuna Kristam <nkristam@...dia.com>
>>>> Acked-by: Thierry Reding <treding@...dia.com>
>>>> ---
>>>>  drivers/usb/gadget/udc/Kconfig      |   12 +
>>>>  drivers/usb/gadget/udc/Makefile     |    1 +
>>>>  drivers/usb/gadget/udc/tegra-xudc.c | 3791 +++++++++++++++++++++++++++++++++++
>>>>  3 files changed, 3804 insertions(+)
>>>>  create mode 100644 drivers/usb/gadget/udc/tegra-xudc.c
>>>>
>>>> diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
>>>> index d354036..0fe7577 100644
>>>> --- a/drivers/usb/gadget/udc/Kconfig
>>>> +++ b/drivers/usb/gadget/udc/Kconfig
>>>> @@ -441,6 +441,18 @@ config USB_GADGET_XILINX
>>>>  	  dynamically linked module called "udc-xilinx" and force all
>>>>  	  gadget drivers to also be dynamically linked.
>>>>  
>>>> +config USB_TEGRA_XUDC
>>>> +	tristate "NVIDIA Tegra Superspeed USB 3.0 Device Controller"
>>>> +	depends on ARCH_TEGRA || COMPILE_TEST
>>>> +	depends on PHY_TEGRA_XUSB
>>>> +	select USB_CONN_GPIO
>>> To me, needn't select this driver, without it, the driver still build
>>> pass
>>>
>> Yes compilation passes with out this. Added select for getting USB_CONN_GPIO
>> driver functionality.
> We can enable it in defconfig, think about one day use type-c to do
> dual-role switch, or other ways, will needn't select it then.
> 

Thanks for details, will get it enabled via defconfig instead.

- Nagarjuna
>>
>>>> +	help
>>>> +	 Enables NVIDIA Tegra USB 3.0 device mode controller driver.
>>>> +
>>>> +	 Say "y" to link the driver statically, or "m" to build a
>>>> +	 dynamically linked module called "tegra_xudc" and force all
>>>> +	 gadget drivers to also be dynamically linked.
>>>> +
>>>>  source "drivers/usb/gadget/udc/aspeed-vhub/Kconfig"
>>>>  
> 
>