Linux Kernel iMX6
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/* linux/arch/arm/mach-s3c64xx/setup-keypad.c
* Copyright (c) 2010 Samsung Electronics Co., Ltd.
* GPIO configuration for S3C64XX KeyPad device
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
#include <linux/gpio.h>
#include <plat/gpio-cfg.h>
#include <plat/keypad.h>
#include <mach/gpio-samsung.h>
void samsung_keypad_cfg_gpio(unsigned int rows, unsigned int cols)
/* Set all the necessary GPK pins to special-function 3: KP_ROW[x] */
s3c_gpio_cfgrange_nopull(S3C64XX_GPK(8), rows, S3C_GPIO_SFN(3));
/* Set all the necessary GPL pins to special-function 3: KP_COL[x] */
s3c_gpio_cfgrange_nopull(S3C64XX_GPL(0), cols, S3C_GPIO_SFN(3));