linux-kernel - Re: [PATCH v2 2/3] Input: Add Novatek NT36xxx touchscreen driver

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Message-ID: <20200928215120.GP1681290@dtor-ws>
Date:   Mon, 28 Sep 2020 14:51:20 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Amit Pundir <amit.pundir@...aro.org>
Cc:     kholk11@...il.com, Rob Herring <robh+dt@...nel.org>,
        rydberg@...math.org, priv.luk@...il.com,
        linux-input@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        marijns95@...il.com, Konrad Dybcio <konradybcio@...il.com>,
        martin.botka1@...il.com, phone-devel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] Input: Add Novatek NT36xxx touchscreen driver

On Mon, Sep 28, 2020 at 03:18:18PM +0530, Amit Pundir wrote:
> On Sun, 27 Sep 2020 at 18:06, <kholk11@...il.com> wrote:
> >
> > From: AngeloGioacchino Del Regno <kholk11@...il.com>
> >
> > This is a driver for the Novatek in-cell touch controller and
> > supports various chips from the NT36xxx family, currently
> > including NT36525, NT36672A, NT36676F, NT36772 and NT36870.
> >
> > Functionality like wake gestures and firmware flashing is not
> > included: I am not aware of any of these DrIC+Touch combo
> > chips not including a non-volatile memory and it should be
> > highly unlikely to find one, since the touch firmware is
> > embedded into the DriverIC one, which is obviously necessary
> > to drive the display unit.
> >
> > However, the necessary address for the firmware update
> > procedure was included into the address table in this driver
> > so, in the event that someone finds the need to implement it
> > for a reason or another, it will be pretty straightforward to.
> >
> > This driver is lightly based on the downstream implementation [1].
> > [1] https://github.com/Rasenkai/caf-tsoft-Novatek-nt36xxx
> >
> 
> This is so cool!
> 
> Xiaomi PocoF1 phone uses same family touchscreen IC and I could
> test this series on that phone as well.
> 
> However I do have to make a minor change to get it working. The
> downstream driver and even the github code you linked above use
> GPIO mapped IRQ, and I had to switch to that to get touchscreen
> working with your driver
> https://github.com/pundiramit/linux/commit/0a73eb656c1e80787dc195641ce7b0076fddb38e.
> I wonder if I'm missing any devicetree property other than interrupts?

Simply specifying GPIO controller/pin as interrupt property should work,
there should be no need to parse custom GPIO property and convert it to
IRQ in the driver.

Thanks.

-- 
Dmitry