Anonymous

****board-am335xevm.c****

#include <linux/input.h>
#include <linux/rotary_encoder.h>

/* rotary encoder structures EMEB */
#define ROT_ENC_A_PIN  GPIO_TO_PIN(2, 2)
#define ROT_ENC_B_PIN  GPIO_TO_PIN(2, 3)
static struct rotary_encoder_platform_data my_rotary_encoder_info = {
	.steps		= 24,
	.axis		= REL_DIAL,
	.relative_axis	= true,
	.rollover	= false,
	.gpio_a		= ROT_ENC_A_PIN,
	.gpio_b		= ROT_ENC_B_PIN,
	.inverted_a	= 0,
	.inverted_b	= 0,
	.half_period	= false,
};

static struct platform_device rotary_encoder_device = {
	.name = "rotary-encoder",
	.id = 1,
	.dev = {
		.platform_data = &my_rotary_encoder_info,
	}
};

static struct pinmux_config rot_enc_pin_mux[] = {
	{"gpmc_advn_ale.gpio2_2", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT_PULLUP},
	{"gpmc_oen_ren.gpio2_3", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT_PULLUP},
	{NULL, 0},
};

/* setup rotary encoder EMEB */
static void rot_enc_init(int evm_id, int profile)
{
	pr_info("Setting up rotary encoder...\n");
	
	/* Set mux, direction, pullup */
	setup_pin_mux(rot_enc_pin_mux);

	/* register device */
	platform_device_register(&rotary_encoder_device);
	
	pr_info("Done setting up rotary encoder.\n");
}


and also 
****mux33xx.c****
	_AM33XX_MUXENTRY(GPMC_ADVN_ALE, 0,
		"gpmc_advn_ale", NULL, NULL, NULL,
		NULL, NULL, NULL, "gpio2_2"),
	_AM33XX_MUXENTRY(GPMC_OEN_REN, 0,
		"gpmc_oen_ren", NULL, NULL, NULL,
		NULL, NULL, NULL, "gpio2_3"),