netdev - Re: [PATCH 3/3] net: dsa: mt7530: add GPIOLIB dependency

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Message-ID: <CALW65jZPQm88CDa+bvkk-EJGfyV88hRV=MSOjSt1Q5UxD8xrog@mail.gmail.com>
Date:   Thu, 25 Feb 2021 23:52:40 +0800
From:   DENG Qingfang <dqfext@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vladimir Oltean <olteanv@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Landen Chao <landen.chao@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        netdev <netdev@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] net: dsa: mt7530: add GPIOLIB dependency

Hi Arnd,

On Thu, Feb 25, 2021 at 10:40 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> The new gpio support may be optional at runtime, but it requires
> building against gpiolib:
>
> ERROR: modpost: "gpiochip_get_data" [drivers/net/dsa/mt7530.ko] undefined!
> ERROR: modpost: "devm_gpiochip_add_data_with_key" [drivers/net/dsa/mt7530.ko] undefined!
>
> Add a Kconfig dependency to enforce this.

I think wrapping the GPIO code block with #ifdef CONFIG_GPIOLIB ...
#endif may be a better idea.

>
> Fixes: 429a0edeefd8 ("net: dsa: mt7530: MT7530 optional GPIO support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>