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

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Date:   Fri, 25 Feb 2022 15:39:16 +0800
From:   Yu Tu <yu.tu@...ogic.com>
To:     <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>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Yu Tu <yu.tu@...ogic.com>
Subject: [PATCH V7 0/6] Use CCF to describe the UART baud rate clock

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.

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
-- 
2.33.1