linux-kernel - Re: [PATCH 3/4] pinctrl: stm32: Implement .get_direction gpio

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Date:   Mon, 24 Apr 2017 14:37:52 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Alexandre TORGUE <alexandre.torgue@...com>
Cc:     Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Patrice Chotard <patrice.chotard@...com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 3/4] pinctrl: stm32: Implement .get_direction gpio_chip callback

On Fri, Apr 7, 2017 at 5:10 PM, Alexandre TORGUE
<alexandre.torgue@...com> wrote:

> Add .get_direction() gpiochip callback in STM32 pinctrl driver.
>
> Signed-off-by: Alexandre TORGUE <alexandre.torgue@...com>

(...)
> +#include <linux/gpio.h>

No this is wrong, drivers should never include this file.
It is a deprecated consumer header.

> +       if ((alt == 0) && (mode == 0))
> +               ret = GPIOF_DIR_IN;
> +       else if ((alt == 0) && (mode == 1))
> +               ret = GPIOF_DIR_OUT;

Just return 0 or 1, that is the driver-internal API.

Yours,
Linus Walleij