linux-kernel - Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver

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Message-ID: <bfbb883b-f222-922e-bdf0-3491af14e446@infradead.org>
Date:   Thu, 20 Feb 2020 16:21:20 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Scott Branden <scott.branden@...adcom.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        David Brown <david.brown@...aro.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Shuah Khan <shuah@...nel.org>, bjorn.andersson@...aro.org,
        Shuah Khan <skhan@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>
Cc:     "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
        Olof Johansson <olof@...om.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Colin Ian King <colin.king@...onical.com>,
        Kees Cook <keescook@...omium.org>,
        Takashi Iwai <tiwai@...e.de>, linux-kselftest@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Desmond Yan <desmond.yan@...adcom.com>,
        James Hu <james.hu@...adcom.com>
Subject: Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver

On 2/20/20 4:06 PM, Scott Branden wrote:
> Hi Randy,
> 
> On 2020-02-19 5:04 p.m., Randy Dunlap wrote:
>> Hi,
>>
>> On 2/19/20 4:48 PM, Scott Branden wrote:
>>> diff --git a/drivers/misc/bcm-vk/Kconfig b/drivers/misc/bcm-vk/Kconfig
>>> new file mode 100644
>>> index 000000000000..c75dfb89a38d
>>> --- /dev/null
>>> +++ b/drivers/misc/bcm-vk/Kconfig
>>> @@ -0,0 +1,42 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only
>>> +#
>>> +# Broadcom VK device
>>> +#
>>> +config BCM_VK
>>> +    tristate "Support for Broadcom VK Accelerators"
>>> +    depends on PCI_MSI
>>> +    default m
>> Need to justify default m. Normally we don't add drivers as enabled unless
>> they are required for basic (boot) operation.
> Will remove default m as not needed to boot.  Interesting other offload engines misc/ocxl/Kconfig and misc/cxl/Kconfig have default m.

Thanks.

Uh, yes, that is interesting.  They both depend on PPC_POWERNV,
which I know nothing about.

>>> +    help
>>> +      Select this option to enable support for Broadcom
>>> +      VK Accelerators.  VK is used for performing
>>> +      specific video offload processing.  This driver enables
>>> +      userspace programs to access these accelerators via /dev/bcm-vk.N
>>> +      devices.
>>> +
>>> +      If unsure, say N.

-- 
~Randy