linux-kernel - Re: [PATCH] dt-bindings: input: Goodix SPI HID Touchscreen

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Message-ID: <ZyHaugCcAW8E10pG@ux-UP-WHL01>
Date: Wed, 30 Oct 2024 15:05:30 +0800
From: Charles Wang <charles.goodix@...il.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Rob Herring <robh@...nel.org>, Charles Wang <charles.goodix@...il.com>,
	hbarnor@...omium.org, conor.dooley@...rochip.com, jikos@...nel.org,
	bentiss@...nel.org, linux-input@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	Krzysztof Kozlowski <krzk@...nel.org>
Subject: Re: [PATCH] dt-bindings: input: Goodix SPI HID Touchscreen

Hi Dmitry,

On Fri, Oct 25, 2024 at 10:14:52AM -0700, Dmitry Torokhov wrote:
> On Fri, Oct 25, 2024 at 09:19:14AM -0700, Doug Anderson wrote:
> > Hi,
> > 
> > On Fri, Oct 25, 2024 at 8:59 AM Rob Herring <robh@...nel.org> wrote:
> > >
> > > On Fri, Oct 25, 2024 at 10:29 AM Doug Anderson <dianders@...omium.org> wrote:
> > > >
> > > > Charles,
> > > >
> > > > On Fri, Oct 25, 2024 at 5:03 AM Krzysztof Kozlowski <krzk@...nel.org> wrote:
> > > > >
> > > > > > +properties:
> > > > > > +  compatible:
> > > > > > +    enum:
> > > > > > +      - goodix,gt7986u-spi
> > > > >
> > > > > Compatible is already documented and nothing here explains why we should
> > > > > spi variant.
> > > > >
> > > > > > +
> > > > > > +  reg:
> > > > > > +    maxItems: 1
> > > > > > +
> > > > > > +  interrupts:
> > > > > > +    maxItems: 1
> > > > > > +
> > > > > > +  reset-gpios:
> > > > > > +    maxItems: 1
> > > > > > +
> > > > > > +  goodix,hid-report-addr:
> > > > >
> > > > > I do not see this patch addressing previous review. Sending something
> > > > > like this as v1 after long discussions also does not help.
> > > >
> > > > Krzysztof is right that it's better to wait until we get consensus on
> > > > the previous discussion before sending a new patch. I know you were
> > > > just trying to help move things forward, but because of the way the
> > > > email workflow works, sending a new version tends to fork the
> > > > discussion into two threads and adds confusion.
> > > >
> > > > I know Krzysztof and Rob have been silent during our recent
> > > > discussion, but it's also a long discussion. I've been assuming that
> > > > they will take some time to digest and reply in a little bit. If they
> > > > didn't, IMO it would have been reasonable to explicitly ask them for
> > > > feedback in the other thread after giving a bit of time.
> > >
> > > If the firmware creates fundamentally different interfaces, then
> > > different compatibles makes sense. If the same driver handles both bus
> > > interfaces, then 1 compatible should be fine. The addition of '-spi'
> > > to the compatible doesn't give any indication of a different
> > > programming model. I wouldn't care except for folks who will see it
> > > and just copy it when their only difference is the bus interface and
> > > we get to have the same discussion all over again. So if appending
> > > '-spi' is the only thing you can come up with, make it abundantly
> > > clear so that others don't blindly copy it. The commit msg is useful
> > > for convincing us, but not for that purpose.
> > 
> > OK, makes sense. Charles: Can you think of any better description for
> > this interface than "goodix,gt7986u-spi"? I suppose you could make it
> > super obvious that it's running different firmware with
> > "goodix,gt7986u-spifw" and maybe that would be a little better.
> 
> Is there any chance for Microsoft-compatible HID-over-SPI versions of
> the firmware for this chip? Will this require new compatible string? Or
> it will be a different chip ID and the issue will be moot?
> 
No, the SPI hardware design of this chip does not meet the requirements for
the Microsoft HID-over-SPI protocol. A new chip with a new ID will be
developed to support the Microsoft HID-over-SPI protocol.

Thanks,
Charles