linux-kernel - Re: [PATCH] input: ixp4xx-beeper: include linux/io.h

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Date:   Wed, 2 Oct 2019 14:00:14 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Enrico Weigelt <info@...ux.net>,
        Linux Input <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] input: ixp4xx-beeper: include linux/io.h

On Wed, Oct 2, 2019 at 11:57 AM Arnd Bergmann <arnd@...db.de> wrote:

> asm/io.h may not be included implicitly, causing a rare
> randconfig build error:
>
> drivers/input/misc/ixp4xx-beeper.c:48:3: error: implicit declaration of function '__raw_writel' [-Werror,-Wimplicit-function-declaration]
>                 __raw_writel((count & ~IXP4XX_OST_RELOAD_MASK) | IXP4XX_OST_ENABLE,
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

I am thinking a bit about the future of this driver. Isn't it more
reasonable to just make a hrtimer-driven PWM and use the existing
PWM userspace ABI and timer framework in Linux for this?
Not that there is a generic timer-driven PWM but ... that is
essentially what this driver is.

Yours,
Linus Walleij