linux-kernel - Re: [PATCH v3 4/4] usb: host: add xhci-exynos driver

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Message-ID: <0366bcc4-b38d-db36-22d6-e6f33af9dbef@kernel.org>
Date:   Wed, 23 Mar 2022 09:26:13 +0100
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Jung Daehwan <dh10.jung@...sung.com>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:USB XHCI DRIVER" <linux-usb@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Howard Yen <howardyen@...gle.com>,
        Jack Pham <jackp@...eaurora.org>,
        Puma Hsu <pumahsu@...gle.com>,
        "J . Avila" <elavila@...gle.com>, sc.suh@...sung.com
Subject: Re: [PATCH v3 4/4] usb: host: add xhci-exynos driver

On 23/03/2022 03:34, Jung Daehwan wrote:
> On Tue, Mar 22, 2022 at 06:10:00PM +0100, Krzysztof Kozlowski wrote:
>> On 21/03/2022 09:59, Daehwan Jung wrote:
>>> This driver supports USB Audio offload with Co-processor.
>>
>> One do you need one more XHCI driver? How does it differ from existing
>> and why existing cannot be extended?
> 
> I have some exynos specific features and that's because need own driver.
> It's not good to modify other XHCI driver for my features.
> 
> Additinally, I've been developing some features with other IP or Co-Processors.
> Extending is not enough to cover them and I think owning driver is also better
> on structural view.

This reason is not good enough because it's not visible that you cannot
extend existing drivers.


Best regards,
Krzysztof