linux-kernel - Re: [PATCH v2 1/3] gpio:gpio-npcm-sgpio: Add Nuvoton sgpio driver

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Message-ID: <CACRpkdb5NzUcnu6yK6t9CUPVb=FSpSJdWOwHVbJqq5FxapT_RA@mail.gmail.com>
Date:   Tue, 8 Nov 2022 14:02:50 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Jim Liu <jim.t90615@...il.com>
Cc:     JJLIU0@...oton.com, KWLIU@...oton.com, brgl@...ev.pl,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v2 1/3] gpio:gpio-npcm-sgpio: Add Nuvoton sgpio driver

Hi Jim!

thanks for your patch!

On Tue, Nov 8, 2022 at 10:29 AM Jim Liu <jim.t90615@...il.com> wrote:

> Add Nuvoton BMC sgpio driver support.
>
> Signed-off-by: Jim Liu <JJLIU0@...oton.com>
> ---
> Changes for v2:
>    - add prefix
>    - write the enum values in all capitals
>    - remove _init in npcm_sgpio_probe

Overall this looks very good.

But:

> +       u8 nin_sgpio;
> +       u8 nout_sgpio;

These seem to be software constructs, for which you also add
custom device tree bindings.

The purpose seems to be an extra layer of protection, such as
blocking a user from setting some GPIOs as input or output.

I think you should just remove this, the GPIO driver is already
sufficiently low level without the need of protecting the users
from themselves.

Yours,
Linus Walleij