linux-kernel - Re: [PATCH v3 4/4] usb: musb: Add support for MediaTek musb controller

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Date:   Fri, 18 Jan 2019 07:34:08 -0600
From:   Bin Liu <b-liu@...com>
To:     Min Guo <min.guo@...iatek.com>
CC:     Tony Lindgren <tony@...mide.com>, Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Alan Stern <stern@...land.harvard.edu>,
        <chunfeng.yun@...iatek.com>, <linux-usb@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <hdegoede@...hat.com>,
        Yonglong Wu <yonglong.wu@...iatek.com>
Subject: Re: [PATCH v3 4/4] usb: musb: Add support for MediaTek musb
 controller

Hi Min,

On Fri, Jan 18, 2019 at 02:14:14PM +0800, Min Guo wrote:
> On Thu, 2019-01-17 at 06:33 -0800, Tony Lindgren wrote:
> > Hi,
> > 
> > * min.guo@...iatek.com <min.guo@...iatek.com> [190117 07:16]:
> > > There are some quirk of MediaTek musb controller, such as:
> > >  -W1C interrupt status registers
> > >  -Private data toggle registers
> > >  -No dedicated DMA interrupt line
> > 
> > Can you please separate the musb generic changes listed above
> > into separate individual patches in preparation for adding
> > support for new hardware?
> > 
> > Otherwise we'll have hard time finding out with git bisect what
> > exactly breaks things if we run into trouble.
> 
> Thanks for your suggestion.
> I prepared to divide these changes into separate patches. Later, Mr.Bin
> suggested not to do this.

Initially I thought the clearb/w() changes should be just a couple
lines, so didn't think to separate it. But after reviewed the final
implemenation, I agree Tony's comment is the right thing to do, please
separate the musb core changes, each for clearb/w(), get/set_toggle(),
and dma.

Regards,
-Bin.