linux-kernel - Re: [PATCH v5 12/13] gpio: Add support for Airoha EN7523 GPIO controller

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Date:   Thu, 2 Dec 2021 02:47:02 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Felix Fietkau <nbd@....name>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Bartosz Golaszewski <brgl@...ev.pl>, john@...ozen.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v5 12/13] gpio: Add support for Airoha EN7523 GPIO controller

Hi Felix!

Thanks for your patch!

On Mon, Nov 29, 2021 at 4:54 PM Felix Fietkau <nbd@....name> wrote:

> From: John Crispin <john@...ozen.org>
>
> Airoha's GPIO controller on their ARM EN7523 SoCs consists of two banks of 32
> GPIOs. Each instance in DT is for an single bank.
>
> Signed-off-by: John Crispin <john@...ozen.org>
> Signed-off-by: Felix Fietkau <nbd@....name>

(...)
> +config GPIO_EN7523
> +       tristate "Airoha GPIO support"
> +       depends on ARCH_AIROHA
> +       default ARCH_AIROHA
> +       select GPIO_GENERIC

Yes that looks applicable, but why isn't it used?

The few 32-bit registers look like an ideal candidate for
using the generic GPIO. Check similar drivers such as
drivers/gpio/gpio-ftgpio010.c and how it uses
bgpio_init() and the nice doc for bgpio_init() in
drivers/gpio/gpio-mmio.c.

If it's not working already with generic GPIO I do not
think it would be far fetched to fix it.

Yours,
Linus Walleij