linux-kernel - Re: [PATCH] HID: i2c-hid: goodix: Add ili9882t timing

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Date:   Fri, 19 May 2023 07:01:56 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Cong Yang <yangcong5@...qin.corp-partner.google.com>
Cc:     jikos@...nel.org, benjamin.tissoires@...hat.com, mka@...omium.org,
        dmitry.torokhov@...il.com, hsinyi@...gle.com,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH] HID: i2c-hid: goodix: Add ili9882t timing

Hi,

On Fri, May 19, 2023 at 2:02 AM Cong Yang
<yangcong5@...qin.corp-partner.google.com> wrote:
>
> The ili9882t is a TDDI IC ((Touch with Display Driver)). It requires the
> panel reset gpio to be high before i2c commands. Use a longer delay in
> post_power_delay_ms to ensure the poweron sequence.
>
> Signed-off-by: Cong Yang <yangcong5@...qin.corp-partner.google.com>
> ---
>  drivers/hid/i2c-hid/i2c-hid-of-goodix.c | 6 ++++++
>  1 file changed, 6 insertions(+)

Two comments:

1. You need to submit a bindings patch to document your
"ilitek,ili9882t" compatible string.

2. I would tend to add the support to the "i2c-hid-of-elan.c" driver
instead of the goodix one. Probably the drivers need to combined again
(I'll see if I can post a patch for that before too long), but if I
were picking one I'd pick the elan one, I think.

-Doug