linux-kernel - Re: [PATCH v3 0/3] implement I2C retries for mXT1368

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Date:   Wed, 21 Oct 2020 10:14:29 +0900
From:   "Wang, Jiada" <jiada_wang@...tor.com>
To:     <dmitry.torokhov@...il.com>, <robh+dt@...nel.org>,
        <thierry.reding@...il.com>, <digetx@...il.com>,
        <jonathanh@...dia.com>
CC:     <nick@...anahar.org>, <linux-input@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <erosca@...adit-jv.com>, <andrew_gabbasov@...tor.com>
Subject: Re: [PATCH v3 0/3] implement I2C retries for mXT1368

Hello Dmitry and all

Kind reminder on this patch-set


Thanks,
Jiada

On 2020/10/01 0:12, Jiada Wang wrote:
> According to datasheet, mXT1386 chip has a WAKE line, it is used
> to wake the chip up from deep sleep mode before communicating with
> it via the I2C-compatible interface.
>      
> if the WAKE line is connected to a GPIO line, the line must be
> asserted 25 ms before the host attempts to communicate with the
> mXT1386.
> If the WAKE line is connected to the SCL pin, the mXT1386 will send
> a NACK on the first attempt to address it, the host must then retry
> 25 ms later.
>      
> This patch adds compatible string "atmel,mXT1386" for mXT1386 controller,
> when I2C transfer on mXT1386 fails, retry the transfer once after a
> 25 ms sleep.
> 
> 
> Jiada Wang (3):
>    dt-bindings: input: atmel: add compatible for mXT1386
>    Input: atmel_mxt_ts - implement I2C retries for mXT1368
>    ARM: tegra: add mXT1386 compatible
> 
> ---
> v3:
> change compatible string to lowercase
> 
> v2:
> add bool retry_i2c_transfers to struct mxt_data,
> to indicate whether retry is needed when i2c transfer fails
> 
> v1: initial version
> ---
>   .../bindings/input/atmel,maxtouch.txt         |  1 +
>   .../boot/dts/tegra20-acer-a500-picasso.dts    |  2 +-
>   drivers/input/touchscreen/atmel_mxt_ts.c      | 62 +++++++++++++++----
>   3 files changed, 52 insertions(+), 13 deletions(-)
>