linux-kernel - Re: [PATCH v4 0/3] add support for EXAR XR20M1172 UART

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Date: Fri, 19 Apr 2024 09:42:59 -0400
From: Hugo Villeneuve <hugo@...ovil.com>
To: Konstantin Pugin <rilian.la.te@...ru>
Cc: Konstantin Pugin <ria.freelander@...il.com>, Greg Kroah-Hartman
 <gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>, Hugo
 Villeneuve <hvilleneuve@...onoff.com>, Andy Shevchenko
 <andriy.shevchenko@...ux.intel.com>, Lech Perczak
 <lech.perczak@...lingroup.com>, Ilpo Järvinen
 <ilpo.jarvinen@...ux.intel.com>, Thomas Gleixner <tglx@...utronix.de>,
 linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [PATCH v4 0/3] add support for EXAR XR20M1172 UART

On Fri, 19 Apr 2024 15:45:00 +0300
Konstantin Pugin <rilian.la.te@...ru> wrote:

> From: Konstantin Pugin <ria.freelander@...il.com>
> 
> EXAR XR20M1172 UART is mostly SC16IS762-compatible, but
> it has additional register which can change UART multiplier
> to 4x and 8x, similar to UPF_MAGIC_MULTIPLIER does. So, I used this
> flag to guard access to its specific DLD register. It seems than
> other EXAR SPI UART modules also have this register, but I tested
> only XR20M1172.
> Yes, in datasheet this register is called "DLD - Divisor Fractional"
> or "DLD - Divisor Fractional Register", calling depends on datasheet
> version.

Hi Konstantin,
it would probably be a good idea to also add the device to the list of supported devices for this driver in the Kconfig file.

Hugo.


> 
> I am sorry about too many submissions and top post reply. About second -
> I do not know how to reply properly to this ML from GMail phone app. About first - I just
> get very good feedback from Andy Shevchenko, and want to fix his review picks ASAP.
> 
> Changes in v2:
>   - use full name in git authorship
> 
> Changes in v3:
>   - change formatting of commit messages to unify width
>   - rework commit messages according to code review
>   - add XR20M117X namespace for EXAR-specific register
>   - do not use UPF_MAGIC_MULTIPLIER for checking EXAR chip,
>     use s->devtype directly
>   - replace while loop to fls function and expanded check
>   - sort compatibles
>   - reformat multiline comment.
> 
> Changes in v4:
>   - rebase onto tty-next branch
>   - added Kconfig mention of the chip
>   - used rounddown_power_of_two instead of fls and manual shift
>   - used FIELD_PREP instead of custom macro
>   - removed has_dld bit from common struct, replaced by check function,
>     which checks directly by s->devtype
>   - fixed tab count
>   - properly apply Vladimir Zapolskiy's tag to patch 2 only
> 
> Konstantin Pugin (3):
>   serial: sc16is7xx: announce support of SER_RS485_RTS_ON_SEND
>   dt-bindings: sc16is7xx: Add compatible line for XR20M1172 UART
>   serial: sc16is7xx: add support for EXAR XR20M1172 UART
> 
>  .../bindings/serial/nxp,sc16is7xx.yaml        |  1 +
>  drivers/tty/serial/Kconfig                    | 18 +++---
>  drivers/tty/serial/sc16is7xx.c                | 62 +++++++++++++++++--
>  drivers/tty/serial/sc16is7xx_i2c.c            |  1 +
>  drivers/tty/serial/sc16is7xx_spi.c            |  1 +
>  5 files changed, 70 insertions(+), 13 deletions(-)
> 
> 
> base-commit: c6795fbffc4547b40933ec368200bd4926a41b44
> -- 
> 2.34.1
> 
> 
> 


-- 
Hugo Villeneuve <hugo@...ovil.com>