linux-kernel - Re: [PATCH v6 0/2] usb: serial: add support for CH348

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Message-ID: <799d01c6-e256-468b-a913-5945f22b5789@ixit.cz>
Date:   Thu, 17 Aug 2023 01:34:35 +0200
From:   David Heidelberg <david@...t.cz>
To:     johan@...nel.org, Corentin Labbe <clabbe@...libre.com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v6 0/2] usb: serial: add support for CH348

Hello Johan,

Any chance to get CH348 into 6.5?

I want to highlight that from all serials I have around this is the only 
one which support 1500000 baud (needed for Rockchip devices).

Thank you!
David


On 28/06/2023 15:38, Corentin Labbe wrote:
> Hello
>
> The CH348 is an octo serial to USB adapter.
> The following patch adds a driver for supporting it.
> Since there is no public datasheet, unfortunatly it remains some magic values.
>
> It was tested with a large range of baud from 1200 to 1500000 and used with
> success in one of our kernel CI testlab.
>
> Regards
>
> Changes since v1:
> - use a data structure for encoding/decoding messages.
> - check if needed endpoints exists
> - fix URB leak in ch348_allocate_status_read error case
> - test for maximum baud rate as stated by datasheet
>
> Changes since v2:
> - specify ch348_rxbuf data length
> - Use correct speed_t dwDTERate instead of __le32
> - test for maximum baud rate supported according to datasheet
> - Use a define for CH348_TX_HDRSIZE
>
> Changes since v3
> - Fixed all reported problem from https://lore.kernel.org/lkml/Y5NDwEakGJbmB6+b@Red/T/#mb6234d0427cfdabf412190565e215995a41482dd
>    Mostly reworked the endpoint mux to be the same than mx_uport
>
> Changes since v4:
> - The V4 was sent against stable and next have ch348_set_termios ktermios
>    parameter const that I forgot to change
>
> Changes since v5:
> - Fixed all reported problem from https://lore.kernel.org/lkml/20230106135338.643951-1-clabbe@baylibre.com/T/#m044aab24dfb652ea34aa06f8ef704da9d6a2e036
> - Major change is dropping of all status handling which was unused.
>    It will be probably necessary to bring it back when using GPIO.
>    This will be done when I will finish my next devboard.
>
> Corentin Labbe (2):
>    usb: serial: add support for CH348
>    usb: serial: add myself as maintainer of CH348
>
>   MAINTAINERS                 |   5 +
>   drivers/usb/serial/Kconfig  |   9 +
>   drivers/usb/serial/Makefile |   1 +
>   drivers/usb/serial/ch348.c  | 491 ++++++++++++++++++++++++++++++++++++
>   4 files changed, 506 insertions(+)
>   create mode 100644 drivers/usb/serial/ch348.c
>
-- 
David Heidelberg
Certified Linux Magician