linux-kernel - Re: [PATCH v7] HID: mcp2200: added driver for GPIOs of MCP2200

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Date:   Fri, 22 Sep 2023 04:32:41 +0000
From:   Rahul Rameshbabu <sergeantsagara@...tonmail.com>
To:     Johannes Roith <johannes@...-linux.rocks>
Cc:     jikos@...nel.org, andi.shyti@...nel.org,
        benjamin.tissoires@...hat.com, christophe.jaillet@...adoo.fr,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        rdunlap@...radead.org
Subject: Re: [PATCH v7] HID: mcp2200: added driver for GPIOs of MCP2200

On Thu, 21 Sep, 2023 18:49:28 +0200 "Johannes Roith" <johannes@...-linux.rocks> wrote:
> Added a gpiochip compatible driver to control the 8 GPIOs of
> the MCP2200 by using the HID interface.
>
> Using GPIOs with alternative functions (GP0<->SSPND, GP1<->USBCFG,
> GP6<->RXLED, GP7<->TXLED) will reset the functions, if set (unset by
> default).
>
> The driver was tested while also using the UART of the chip. Setting
> and reading the GPIOs has no effect on the UART communication. However,
> a reset is triggered after the CONFIGURE command. If the GPIO Direction
> is constantly changed, this will affect the communication at low baud
> rates. This is a hardware problem of the MCP2200 and is not caused by
> the driver.
>
> Signed-off-by: Johannes Roith <johannes@...-linux.rocks>
> ---

Reviewed-by: Rahul Rameshbabu <sergeantsagara@...tonmail.com>