linux-kernel - Re: [PATCH V7 0/6] Use CCF to describe the UART baud rate clock

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Date:   Mon, 28 Feb 2022 11:59:53 +0100
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Yu Tu <yu.tu@...ogic.com>, linux-serial@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: Re: [PATCH V7 0/6] Use CCF to describe the UART baud rate clock


On Fri 25 Feb 2022 at 15:39, Yu Tu <yu.tu@...ogic.com> wrote:

> Using the common Clock code to describe the UART baud rate
> clock makes it easier for the UART driver to be compatible
> with the baud rate requirements of the UART IP on different
> meson chips. Add Meson S4 SoC compatible.
>
> The test method:
> Start the console and run the following commands in turn:
> stty -F /dev/ttyAML0 115200 and stty -F /dev/ttyAML0 921600.
>
> Since most SoCs are too old, I was able to find all the platforms myself
> such as Meson6, Meson8, Meson8b, GXL and so on. I only tested it with
> G12A and S4.

GXL based board are still very common an easy to come by.
I'm quite surprised that you are unable to test on this SoC family

>
> Yu Tu (6):
>   tty: serial: meson: Move request the register region to probe
>   tty: serial: meson: Use devm_ioremap_resource to get register mapped
>     memory
>   tty: serial: meson: Describes the calculation of the UART baud rate
>     clock using a clock frame
>   tty: serial: meson: Make some bit of the REG5 register writable
>   tty: serial: meson: The system stuck when you run the stty command on
>     the console to change the baud rate
>   tty: serial: meson: Added S4 SOC compatibility
>
> V6 -> V7: To solve the system stuck when you run the stty command on
> the console to change the baud rate.
> V5 -> V6: Change error format as discussed in the email.
> V4 -> V5: Change error format.
> V3 -> V4: Change CCF to describe the UART baud rate clock as discussed
> in the email.
> V2 -> V3: add compatible = "amlogic,meson-gx-uart". Because it must change
> the DTS before it can be deleted
> V1 -> V2: Use CCF to describe the UART baud rate clock.Make some changes as
> discussed in the email
>
> Link:https://lore.kernel.org/linux-amlogic/20220118030911.12815-4-yu.tu@amlogic.com/
>
>  drivers/tty/serial/meson_uart.c | 221 ++++++++++++++++++++++----------
>  1 file changed, 154 insertions(+), 67 deletions(-)
>
>
> base-commit: a603ca60cebff8589882427a67f870ed946b3fc8