linux-kernel - Re: [PATCH v4 3/5] serial: sc16is7xx: split into core and I2C/SPI parts (core)

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Date: Tue, 23 Apr 2024 12:01:23 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Hugo Villeneuve <hugo@...ovil.com>
Cc: gregkh@...uxfoundation.org, jirislaby@...nel.org, peterz@...radead.org, 
	mingo@...nel.org, linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, 
	andy.shevchenko@...il.com, Hugo Villeneuve <hvilleneuve@...onoff.com>
Subject: Re: [PATCH v4 3/5] serial: sc16is7xx: split into core and I2C/SPI
 parts (core)

Hi Hugo,

On Tue, Apr 9, 2024 at 5:48 PM Hugo Villeneuve <hugo@...ovil.com> wrote:
> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
>
> Split the common code from sc16is7xx driver and move the I2C and SPI bus
> parts into interface-specific source files.
>
> sc16is7xx becomes the core functions which can support multiple bus
> interfaces like I2C and SPI.
>
> No functional changes intended.
>
> Also simplify and improve Kconfig entries.
>   - Capitalize SPI keyword for consistency
>   - Display list of supported ICs each on a separate line (and aligned) to
>     facilitate locating a specific IC model
>   - Add Manufacturer name at start of description string
>   - Add UART keyword to description string
>
> Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>

Thanks for your patch, which is now commit d49216438139bca0
("serial: sc16is7xx: split into core and I2C/SPI parts (core)")
in tty-next (next-20240415 and later).

> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -1021,41 +1021,30 @@ config SERIAL_SCCNXP_CONSOLE
>           Support for console on SCCNXP serial ports.
>
>  config SERIAL_SC16IS7XX_CORE
> -       tristate
> -
> -config SERIAL_SC16IS7XX
> -       tristate "SC16IS7xx serial support"
> +       tristate "NXP SC16IS7xx UART support"

Hence this replaces SERIAL_SC16IS7XX_CORE by SERIAL_SC16IS7XX,
so arch/mips/configs/cu1??0-neo_defconfig needs to updated.

>         select SERIAL_CORE
> -       depends on (SPI_MASTER && !I2C) || I2C
> +       select SERIAL_SC16IS7XX_SPI if SPI_MASTER
> +       select SERIAL_SC16IS7XX_I2C if I2C

So if SPI_MASTER or I2C is enabled, the corresponding SERIAL_SC16IS7XX_*
subdriver can no longer be disabled?  According to
https://lore.kernel.org/all/20240403123501.8ef5c99f65a40ca2c10f635a@hugovilcom/
you did want to support that?

>         help
> -         This selects support for SC16IS7xx serial ports.
> -         Supported ICs are SC16IS740, SC16IS741, SC16IS750, SC16IS752,
> -         SC16IS760 and SC16IS762. Select supported buses using options below.
> +         Core driver for NXP SC16IS7xx UARTs.
> +         Supported ICs are:
> +
> +           SC16IS740
> +           SC16IS741
> +           SC16IS750
> +           SC16IS752
> +           SC16IS760
> +           SC16IS762
> +
> +         The driver supports both I2C and SPI interfaces.
>
>  config SERIAL_SC16IS7XX_I2C
> -       bool "SC16IS7xx for I2C interface"
> -       depends on SERIAL_SC16IS7XX
> -       depends on I2C
> -       select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
> -       select REGMAP_I2C if I2C
> -       default y
> -       help
> -         Enable SC16IS7xx driver on I2C bus,
> -         If required say y, and say n to i2c if not required,
> -         Enabled by default to support oldconfig.
> -         You must select at least one bus for the driver to be built.
> +       tristate
> +       select REGMAP_I2C
>
>  config SERIAL_SC16IS7XX_SPI
> -       bool "SC16IS7xx for spi interface"
> -       depends on SERIAL_SC16IS7XX
> -       depends on SPI_MASTER
> -       select SERIAL_SC16IS7XX_CORE if SERIAL_SC16IS7XX
> -       select REGMAP_SPI if SPI_MASTER
> -       help
> -         Enable SC16IS7xx driver on SPI bus,
> -         If required say y, and say n to spi if not required,
> -         This is additional support to existing driver.
> -         You must select at least one bus for the driver to be built.
> +       tristate
> +       select REGMAP_SPI
>
>  config SERIAL_TIMBERDALE
>         tristate "Support for timberdale UART"

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68korg

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds