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SubjectRe: [PATCH] input: ixp4xx-beeper: include linux/io.h
On Wed, Oct 2, 2019 at 11:57 AM Arnd Bergmann <> 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 <>

Reviewed-by: Linus Walleij <>

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.

Linus Walleij

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