linux-kernel - Re: [PATCH V2 1/2] dt-bindings: input: Introduce Himax HID-over-SPI device

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Date:   Mon, 2 Oct 2023 18:44:41 +0800
From:   yang tylor <tylor_yang@...ax.corp-partner.google.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        dmitry.torokhov@...il.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        jikos@...nel.org, benjamin.tissoires@...hat.com,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        poyuan_chang@...ax.corp-partner.google.com, hbarnor@...omium.org,
        "jingyliang@...omium.org" <jingyliang@...omium.org>,
        wuxy23@...ovo.com, luolm1@...ovo.com,
        hung poyu <poyu_hung@...ax.corp-partner.google.com>
Subject: Re: [PATCH V2 1/2] dt-bindings: input: Introduce Himax HID-over-SPI device

On Fri, Sep 29, 2023 at 12:56 AM Conor Dooley <conor@...nel.org> wrote:
>
> On Thu, Sep 28, 2023 at 10:12:41AM +0800, yang tylor wrote:
> > On Tue, Sep 26, 2023 at 8:53 PM Conor Dooley <conor@...nel.org> wrote:
> > > On Tue, Sep 26, 2023 at 05:52:39PM +0800, yang tylor wrote:
> > > > On Tue, Sep 26, 2023 at 5:02 PM Conor Dooley <conor@...nel.org> wrote:
> > > > > On Mon, Sep 25, 2023 at 06:16:29PM +0800, yang tylor wrote:
> > > > > > On Mon, Sep 25, 2023 at 4:41 PM Conor Dooley <conor.dooley@...rochip.com> wrote:
> > > > > > We have a default prefix firmware name(like himax_xxxx.bin) in the driver code.
> > > > >
> > > > > How do you intend generating the name of the firmware file? I assume the
> > > > > same firmware doesn't work on every IC, so you'll need to pick a
> > > > > different one depending on the compatible?
> > > > >
> > > > If considering a firmware library line-up for all the incoming panels
> > > > of this driver.
> > > > We would use PID as part of the file name. Because all the support panels would
> > > > have a unique PID associated. Which will make the firmware name like
> > > > himax_xxx_{$PID}.bin. The problem is, we need to know PID before firmware load
> > > > at no flash condition. Thus PID information is required in dts when
> > > > no-flash-flag
> > > > is specified.
> > >
> > > Firstly, where does the "xxx" come from?
> > > And you're making it sound more like having firmware-name is suitable
> > > for this use case, given you need to determine the name of the file to
> > > use based on something that is hardware specific but is not
> > > dynamically detectable.
> > Current driver patch uses a prefix name "himax_i2chid" which comes
> > from the previous project
> >  and seems not suitable for this condition, so I use "xxx" and plan to
> > replace it in the next version.
> > For finding firmware, I think both solutions are reasonable.
> > - provide firmware name directly: implies no-flash and use user
> > specified firmware, no PID info.
> > - provide no-flash-flag and PID info: loading firmware from organized
> > names with PID info.
> > I prefer the 2nd solution, but it needs more properties in dts. 1st
> > has less properties and more
> > intuitive.
> >
> > I don't know which one is more acceptable by the community, as you
> > know I'm a newbie here.
>
> To be honest, I am not all that sure either! Does the panel id have
> value in its own right, or is that only used to determine the firmware
> filename?
Currently, PID stands for Panel/Project ID and is used for determining
the firmware filename only. We haven't come up with any new attribute that
may attach to it. The differences between panels are handled in firmware
dedicated to its PID.

> Also, if it does have value in its own right, rather than a "pid",
> should the panel be a child node of this hid device with its own
> compatible?
It may need a child node if we find it necessary to add attributes to each PID.
But currently we have no idea about it.

Thanks,
Tylor