linux-kernel - Re: [PATCH v1 1/1] misc: bcm-vk: add kconfig for supporting viper chip

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Message-ID: <3b2ff726-7ed8-9810-8d06-078f4f1fa4d8@broadcom.com>
Date:   Wed, 23 Feb 2022 09:59:48 -0800
From:   Scott Branden <scott.branden@...adcom.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Desmond yan <desmond.yan@...adcom.com>,
        Olof Johansson <olofj@...com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        bcm-kernel-feedback-list@...adcom.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/1] misc: bcm-vk: add kconfig for supporting viper
 chip

Hi Greg,

On 2022-02-22 23:26, Greg Kroah-Hartman wrote:
> On Tue, Feb 22, 2022 at 09:14:02PM -0800, Desmond yan wrote:
>>
>> Greg,
>>
>> Please see inlined.
>>
>> On 2/22/22 09:13, Greg Kroah-Hartman wrote:
>>> A: http://en.wikipedia.org/wiki/Top_post
>>> Q: Were do I find info about this thing called top-posting?
>>> A: Because it messes up the order in which people normally read text.
>>> Q: Why is top-posting such a bad thing?
>>> A: Top-posting.
>>> Q: What is the most annoying thing in e-mail?
>>>
>>> A: No.
>>> Q: Should I include quotations after my reply?
>>>
>>>
>>> http://daringfireball.net/2007/07/on_top
>>>
>>> On Tue, Feb 22, 2022 at 07:41:04AM -0800, Desmond Yan (APD) wrote:
>>>> Greg,
>>>>
>>>> This is to allow the customer to use their own driver, by default,
>>>> which is their preferred option.
>>>
>>> We do not care about out-of-tree code, and do not add Kconfig options
>>> just for that, sorry.
>>>
>>> Why not just add the out-of-tree driver here to the in-kernel code?
>>> What is preventing that from happening today?
>>
>> Using the bcm_vk driver for viper is only for proof-of-concept, and is not
>> aimed to be deployed for production.  In parallel, customer is developing
>> their own production-ready driver and would probably upstream it whenever
>> the appropriate time comes.
> 
> Ok, so let us not add a new config option only for one person working on
> writing their own driver.  Let's just add the device id as there are
> more people than just that one person wanting to use their hardware with
> the existing drivers.
The bcm_vk driver is the official driver for Valkyrie.  For Viper, the 
bcm_vk driver is only for proof of concept, testing, and demonstration 
purposes. For production, the new driver in development will be used.

To support such configuration, we need to have the Viper pci id 
configurable and off by default in the bcm_vk driver to allow the new 
production driver to be developed against the upstream kernel and drivers.
> 
> Please resubmit this without the Kconfig change and I will be glad to
> take it.
I don't understand what there would be to submit?  The Viper pci id is 
already upstreamed into the bcm_vk driver.  The sole purpose of this 
patch is to add the Kconfig option and have it off by default.
> 
> thanks,
> 
> greg k-h

Regards,
Scott

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