linux-kernel - Re: [PATCH] serial: 8250_it8768e: Create iTE IT8768E specific 8250 driver

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Message-Id: <11805e8c-c97b-4297-9c04-462fa1932ce1@app.fastmail.com>
Date: Thu, 09 Jan 2025 13:40:14 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: WangYuli <wangyuli@...ontech.com>,
 "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 "Jiri Slaby" <jirislaby@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
 "Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
 "Arnd Bergmann" <arnd@...nel.org>,
 "Niklas Schnelle" <schnelle@...ux.ibm.com>, pnewman@...necttech.com,
 "Sunil V L" <sunilvl@...tanamicro.com>,
 "Paul E. McKenney" <paulmck@...nel.org>, zhanjun@...ontech.com,
 guanwentao@...ontech.com, "Zhuozhen He" <hezhuozhen@...ontech.com>,
 "Guowei Chen" <chenguowei@...ontech.com>
Subject: Re: [PATCH] serial: 8250_it8768e: Create iTE IT8768E specific 8250 driver

On Thu, Jan 9, 2025, at 13:08, WangYuli wrote:
> [ General description per its product manual: ]
>   The IT8768E-I is a highly integrated Super I/O using the Low Pin
>   Count Interface. The device’s LPC interface complies with Intel
>   "LPC Interface Specification Rev. 1.1”. The IT8768E-I is ACPI &
>   LANDesk compliant.
>
>   Integrated in the IT8768E-I are five logical devices, which can
>   be individually enabled or disabled via software configuration
>   registers, and four 16C550standard compatible enhanced UARTs
>   perofrmacing asynchronous communication. The devices also provide
>   GPIO port controlling up to 12 GPIO pins.
>
>   The IT8768E-I utilizes power-saving circuitry to reduce power
>   consumption, and once a logical device is disabled, the inputs
>   are inhibited with the clock disabled and the outputs are
>   tri-stated. The device requires a single 24/48 MHz clock input
>   and operates with +3.3V power supply. The IT8768E-I is available
>   in 48-pin LQFP.
>
> It has been determined that this chip is currently employed within
> YIHUA STS-320 intelligent teller terminals utilizing
> PCBA F21-2401 D2000 MB VerA LF motherboards.

Can you explain why this isn't done as part of
drivers/tty/serial/8250/8250_pnp.c?

I see nothing unusual in here that requires a custom driver.

      Arnd