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Date:	Fri, 20 May 2016 22:11:37 -0400
From:	Javier Martinez Canillas <>
To:	Arnd Bergmann <>, Kukjin Kim <>,
	Krzysztof Kozlowski <>
Subject: Re: [PATCH] ARM: exynos: don't select keyboard driver

Hello Arnd,

On 05/18/2016 10:17 AM, Arnd Bergmann wrote:
> The samsung-keypad driver is implicitly selected by ARCH_EXYNOS4 (why?),
> but this fails if CONFIG_INPUT is a loadable module:
> drivers/input/built-in.o: In function `samsung_keypad_remove':
> drivers/input/keyboard/samsung-keypad.c:461: undefined reference to `input_unregister_device'
> drivers/input/built-in.o: In function `samsung_keypad_irq':
> drivers/input/keyboard/samsung-keypad.c:137: undefined reference to `input_event'
> drivers/input/built-in.o: In function `samsung_keypad_irq':
> include/linux/input.h:389: undefined reference to `input_event'
> drivers/input/built-in.o: In function `samsung_keypad_probe':
> drivers/input/keyboard/samsung-keypad.c:358: undefined reference to `devm_input_allocate_device'
> drivers/input/built-in.o:(.debug_addr+0x34): undefined reference to `input_set_capability'
> This removes the 'select' as suggested by Krzysztof Kozlowski and
> instead enables the driver from the defconfig files.
> The problem does not happen on mainline kernels, as we don't normally
> build built-in input drivers when CONFIG_INPUT=m, but I am experimenting
> with a patch to change this, and the samsung keypad driver showed up
> as one example that was silently broken before.
> Signed-off-by: Arnd Bergmann <>
> Link:
> ---

Reviewed-by: Javier Martinez Canillas <>

Best regards,
Javier Martinez Canillas
Open Source Group
Samsung Research America

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