linux-kernel - Re: [PATCH v2 4/4] usb: musb: Add support for MediaTek musb controller

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Date:   Wed, 16 Jan 2019 07:59:14 -0600
From:   Bin Liu <b-liu@...com>
To:     Min Guo <min.guo@...iatek.com>
CC:     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>,
        Yonglong Wu <yonglong.wu@...iatek.com>
Subject: Re: [PATCH v2 4/4] usb: musb: Add support for MediaTek musb
 controller

On Wed, Jan 16, 2019 at 05:39:02PM +0800, Min Guo wrote:
> Hi Bin,
> 
> On Tue, 2019-01-15 at 14:38 -0600, Bin Liu wrote:
> > Hi Min,
> > 
> > very close, thanks.
> > Below I tried to explain a further cleanup in musb_clearb/w() and
> > musb_get/set_toggle() implementation. Please let me know if it is not
> > clear.
> > 
> > Basically, we don't need musb_default_clearb/w(), just assign the
> > musb_io function pointers to musb_readb/w().
> > 
> > Then the mtk platform musb_clearb/w() calls musb_readb/w() and
> > musb_writeb/w() to handle W1C.
> 
> Sorry to bother you again, I encounter a problem when prepare the patch.

no problem at all.

> The define of musb_clearb/w and musb_readb/w are difference as follow,
> and cannot be directly assigned:
> u8/u16 (*readb/w)(const void __iomem *addr, unsigned offset)
> void (*clearb/w)(void __iomem *addr, unsigned int offset)) 
> 
> if modify clearb/w as:
> u8/u16 (*clearb/w)(const void __iomem *addr, unsigned int offset)) 
> then musb_clear needs writeb/w the const addr.
> Can I delete const in (*readb/w)?

yes, please create a separate patch for it, and for readl() as well,
and stating it is for implementing clearing W1C registers.

Regards,
-Bin.