linux-kernel - Re: [PATCH] hte: tegra194: add GPIOLIB dependency

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Date:   Mon, 23 Oct 2023 14:00:42 +0200
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Dipen Patel <dipenp@...dia.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, timestamp@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hte: tegra194: add GPIOLIB dependency

On Mon, Oct 23, 2023 at 1:57 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> The driver started calling into a few interfaces that are part of GPIOLIB and
> don't have stub implementations otherwise:
>
> drivers/hte/hte-tegra194.c: In function 'tegra_hte_line_xlate':
> drivers/hte/hte-tegra194.c:424:48: error: implicit declaration of function 'gpio_device_get_base'; did you mean 'gpio_device_get_desc'? [-Werror=implicit-function-declaration]
>   424 |                 line_id = desc->attr.line_id - gpio_device_get_base(gs->gdev);
>       |                                                ^~~~~~~~~~~~~~~~~~~~
>       |                                                gpio_device_get_desc
>
> Add a Kconfig dependency to only allow building when this is defined.
>
> Fixes: dc850faa28ee0 ("hte: tegra194: don't access struct gpio_chip")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/hte/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/hte/Kconfig b/drivers/hte/Kconfig
> index 083e67492bf2e..641af722b555d 100644
> --- a/drivers/hte/Kconfig
> +++ b/drivers/hte/Kconfig
> @@ -17,6 +17,7 @@ if HTE
>  config HTE_TEGRA194
>         tristate "NVIDIA Tegra194 HTE Support"
>         depends on (ARCH_TEGRA_194_SOC || COMPILE_TEST)
> +       depends on GPIOLIB
>         help
>           Enable this option for integrated hardware timestamping engine also
>           known as generic timestamping engine (GTE) support on NVIDIA Tegra194
> --
> 2.39.2
>

Thanks. None of the new interfaces are "consumer" APIs and are not
meant to have stubs so depending on GPIOLIB is correct here.

Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>