linux-kernel - Re: [PATCH v2 1/2] Revert "USB: serial: ch341: add new Product ID for CH341A"

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Date:   Mon, 10 May 2021 09:40:47 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Frank Zago <frank@...o.net>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Jan-Niklas Burfeind <kernel@...ionpri.me>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Wolfram Sang <wsa@...nel.org>, linux-usb@...r.kernel.org,
        gunar@...orcht.net
Subject: Re: [PATCH v2 1/2] Revert "USB: serial: ch341: add new Product ID
 for CH341A"

On Thu, Apr 22, 2021 at 07:28:51PM -0500, Frank Zago wrote:
> From: frank zago <frank@...o.net>
> 
> The 0x5512 USB PID is for the I2C/GPIO/SPI interfaces. UART is still
> present but only the TX and RX pins are available; DTS, DTR, ... are
> used for other things. Remove the PID, and let a I2C driver bind to
> it.
> 
> Existing CH341 boards usually have physical jumpers to switch between
> the 3 modes.
> 
> This reverts commit 46ee4abb10a07bd8f8ce910ee6b4ae6a947d7f63.

You can't just revert something which people clearly depend on and
therefore added to the kernel in the first place.

Can you reprogram the device with a newly allocated PID to be used for
i2c-only instead?
 
Johan