1、 将gpio13和gpio17也当作普通gpio使用，修改
target/linux/ar71xx/files/arch/mips/ath79/mach-dragino2.c文件如下
/*
* DRAGINO V2 board support, based on Atheros AP121 board support
*
* Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2012 Elektra Wagenrad <elektra@villagetelco.org>
*
* 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 <asm/mach-ath79/ath79.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#include "common.h"
#include "dev-eth.h"
#include "dev-gpio-buttons.h"
#include "dev-leds-gpio.h"
#include "dev-m25p80.h"
#include "dev-spi-gpio.h" // add by merlin
#include "dev-spi.h"
#include "dev-usb.h"
#include "dev-wmac.h"
#include "machtypes.h" #define DRAGINO2_GPIO_LED_WLAN 0
//#define DRAGINO2_GPIO_LED_LAN 13
//#define DRAGINO2_GPIO_LED_WAN 17 /*
* The following GPIO is actually named "Router" on the board.
* However, since the "Router" feature is not supported as of yet
* we use it to display USB activity.
*/ #define DRAGINO2_GPIO_LED_USB 28
#define DRAGINO2_GPIO_BTN_JUMPSTART 11
#define DRAGINO2_GPIO_BTN_RESET 12 #define DRAGINO2_KEYS_POLL_INTERVAL 20 /* msecs */
#define DRAGINO2_KEYS_DEBOUNCE_INTERVAL (3 * DRAGINO2_KEYS_POLL_INTERVAL) #define DRAGINO2_MAC0_OFFSET 0x0000
#define DRAGINO2_MAC1_OFFSET 0x0006
#define DRAGINO2_CALDATA_OFFSET 0x1000
#define DRAGINO2_WMAC_MAC_OFFSET 0x1002 static struct gpio_led dragino2_leds_gpio[] __initdata = {
// {
// .name = "dragino2:red:lan",
// .gpio = DRAGINO2_GPIO_LED_LAN,
// .active_low = 0,
// },
{
.name = "dragino2:red:wlan",
.gpio = DRAGINO2_GPIO_LED_WLAN,
.active_low = ,
},
// {
// .name = "dragino2:red:wan",
// .gpio = DRAGINO2_GPIO_LED_WAN,
// .active_low = 0,
// },
{
.name = "dragino2:red:usb",
.gpio = DRAGINO2_GPIO_LED_USB,
.active_low = ,
},
}; static struct gpio_keys_button dragino2_gpio_keys[] __initdata = {
{
.desc = "jumpstart button",
.type = EV_KEY,
.code = KEY_WPS_BUTTON,
.debounce_interval = DRAGINO2_KEYS_DEBOUNCE_INTERVAL,
.gpio = DRAGINO2_GPIO_BTN_JUMPSTART,
.active_low = ,
},
{
.desc = "reset button",
.type = EV_KEY,
.code = KEY_RESTART,
.debounce_interval = DRAGINO2_KEYS_DEBOUNCE_INTERVAL,
.gpio = DRAGINO2_GPIO_BTN_RESET,
.active_low = ,
}
}; static void __init dragino2_common_setup(void)
{
u8 *art = (u8 *) KSEG1ADDR(0x1fff0000); ath79_register_m25p80(NULL);
ath79_register_wmac(art + DRAGINO2_CALDATA_OFFSET,
art + DRAGINO2_WMAC_MAC_OFFSET); ath79_init_mac(ath79_eth0_data.mac_addr, art + DRAGINO2_MAC0_OFFSET, );
ath79_init_mac(ath79_eth1_data.mac_addr, art + DRAGINO2_MAC1_OFFSET, ); ath79_register_mdio(, 0x0); /* Enable GPIO15 and GPIO16 and possibly GPIO26 and GPIO27 */
//ath79_gpio_function_disable(AR933X_GPIO_FUNC_ETH_SWITCH_LED2_EN |
// AR933X_GPIO_FUNC_ETH_SWITCH_LED3_EN);
ath79_gpio_function_disable(AR933X_GPIO_FUNC_ETH_SWITCH_LED0_EN |
AR933X_GPIO_FUNC_ETH_SWITCH_LED1_EN |
AR933X_GPIO_FUNC_ETH_SWITCH_LED2_EN |
AR933X_GPIO_FUNC_ETH_SWITCH_LED3_EN |
AR933X_GPIO_FUNC_ETH_SWITCH_LED4_EN); /* LAN ports */
ath79_register_eth(); /* WAN port */
ath79_register_eth(); // add by merlin 2014-07-18
ath79_register_spi_gpio();
} static void __init dragino2_setup(void)
{
dragino2_common_setup(); ath79_register_leds_gpio(-, ARRAY_SIZE(dragino2_leds_gpio),
dragino2_leds_gpio);
ath79_register_gpio_keys_polled(-, DRAGINO2_KEYS_POLL_INTERVAL,
ARRAY_SIZE(dragino2_gpio_keys),
dragino2_gpio_keys);
ath79_register_usb();
} MIPS_MACHINE(ATH79_MACH_DRAGINO2, "DRAGINO2", "Dragino Dragino v2",
dragino2_setup);
注意两点，1，将DRAGINO2_GPIO_LED_LAN和DRAGINO2_GPIO_LED_WAN相关定义注释掉；2，将管脚当做普通gpio使用，要在ath79_gpio_function_disable函数中添加相关内容，按默认的即可。
2、测试
如测试LED3 (GPIO_14)和LED6 (GPIO_17)
root@SC-M-BASE:/sys/class/gpio# echo > export
root@SC-M-BASE:/sys/class/gpio# echo out > gpio14/direction
root@SC-M-BASE:/sys/class/gpio# echo > gpio14/value
root@SC-M-BASE:/sys/class/gpio# echo > export
root@SC-M-BASE:/sys/class/gpio# echo out > gpio17/direction
root@SC-M-BASE:/sys/class/gpio# echo > gpio17/value
参考：