linux-kernel - Re: [PATCH v18 2/8] mfd: simple-mfd-i2c: Add a Kconfig name

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Date:   Tue, 8 Mar 2022 11:53:39 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Alistair Francis <alistair@...stair23.me>
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Liam Girdwood <lgirdwood@...il.com>,
        Lee Jones <lee.jones@...aro.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        linux-hwmon@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, NXP Linux Team <linux-imx@....com>,
        Zhang Rui <rui.zhang@...el.com>, alistair23@...il.com,
        Amit Kucheria <amitk@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Andreas Kemnade <andreas@...nade.info>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH v18 2/8] mfd: simple-mfd-i2c: Add a Kconfig name

Hi Alistair,

Thanks for your patch, which is now commit bae5a4acef67db88
("mfd: simple-mfd-i2c: Add a Kconfig name") in mfd/for-mfd-next.

On Mon, Jan 24, 2022 at 1:24 PM Alistair Francis <alistair@...stair23.me> wrote:
> Add a Kconfig name to the "Simple Multi-Functional Device support (I2C)"
> device so that it can be enabled via menuconfig.

Which still does not explain why this would be needed...

> Signed-off-by: Alistair Francis <alistair@...stair23.me>
> Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>

> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -1188,7 +1188,7 @@ config MFD_SI476X_CORE
>           module will be called si476x-core.
>
>  config MFD_SIMPLE_MFD_I2C
> -       tristate
> +       tristate "Simple Multi-Functional Device support (I2C)"
>         depends on I2C
>         select MFD_CORE
>         select REGMAP_I2C

The help text states:

| This driver creates a single register map with the intention for it
| to be shared by all sub-devices.

Yes, that's what MFD does?

| Once the register map has been successfully initialised, any
| sub-devices represented by child nodes in Device Tree will be
| subsequently registered.

OK...?

Still, no clue about what this driver really does, and why and when
it would be needed.

There is one driver symbol that selects MFD_SIMPLE_MFD_I2C.
There are no driver symbols that depend on this symbol.

If you have a driver in the pipeline that can make use of this,
can't it just select MFD_SIMPLE_MFD_I2C, so the symbol itself can
stay invisible?

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

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