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 = 0, }, // { // .name = "dragino2:red:wan", // .gpio = DRAGINO2_GPIO_LED_WAN, // .active_low = 0, // }, { .name = "dragino2:red:usb", .gpio = DRAGINO2_GPIO_LED_USB, .active_low = 0, }, }; 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 = 1, }, { .desc = "reset button", .type = EV_KEY, .code = KEY_RESTART, .debounce_interval = DRAGINO2_KEYS_DEBOUNCE_INTERVAL, .gpio = DRAGINO2_GPIO_BTN_RESET, .active_low = 1, } }; 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, 0); ath79_init_mac(ath79_eth1_data.mac_addr, art + DRAGINO2_MAC1_OFFSET, 0); ath79_register_mdio(0, 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(1); /* WAN port */ ath79_register_eth(0); // add by merlin 2014-07-18 ath79_register_spi_gpio(); } static void __init dragino2_setup(void) { dragino2_common_setup(); ath79_register_leds_gpio(-1, ARRAY_SIZE(dragino2_leds_gpio), dragino2_leds_gpio); ath79_register_gpio_keys_polled(-1, 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 14 > export root@SC-M-BASE:/sys/class/gpio# echo out > gpio14/direction root@SC-M-BASE:/sys/class/gpio# echo 1 > gpio14/value root@SC-M-BASE:/sys/class/gpio# echo 17 > export root@SC-M-BASE:/sys/class/gpio# echo out > gpio17/direction root@SC-M-BASE:/sys/class/gpio# echo 1 > gpio17/value
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