[问答]

请问大佬RK3288如何开机GPIO为高或者为低？

1268 RK3288

问答对人有帮助，内容完整，我也想知道答案 0 请问大佬RK3288如何开机GPIO为高或者为低？ 0 RK3288如何开机GPIO为高或者为低.pdf 52.82 KB , 下载次数: 0
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答案对人有帮助，有参考价值 0 1，修改/kernel/arch/arm/boot/dts/rk3288-box.dts u*_control { compatible = "rockchip,rk3288-u-control"; host_drv_gpio = <&gpio0 GPIO_B6 GPIO_ACTIVE_LOW>;//modify by jiangdou otg_drv_gpio = <&gpio0 GPIO_B4 GPIO_ACTIVE_LOW>; ++ 3G_VCC_33_POWER = <&gpio7 GPIO_A5 GPIO_ACTIVE_HIGH>;//modify by jiangdou for 3G_POWER 2,修改/kernel/drivers/u/dwc_otg_310/udev_rk32.c ++#define INVALID_GPIO -1 //add for 3G_power by jiangdou ++int power_3g_en = INVALID_GPIO;//add for 3G_power by jiangdou static int rk_u*_control_probe(struct platform_device pdev) { int gpio, err; struct device_node np = pdev->dev.of_node; int ret = 0; control_u** = devm_kzalloc(&pdev->dev, sizeof(control_u), GFP_KERNEL); if (!control_u) { dev_err(&pdev->dev, "unable to alloc memory for control un"); ret = -ENOMEM; goto out; } control_u->chip_id = RK3288_USB_CTLR; control_u->remote_wakeup = of_property_read_bool(np, "rockchip,remote_wakeup"); control_u->u_irq_wakeup = of_property_read_bool(np, "rockchip,u_irq_wakeup"); INIT_DELAYED_WORK(&control_u->u_charger_det_work, u_battery_charger_detect_work); control_u->host_gpios = devm_kzalloc(&pdev->dev, sizeof(struct gpio), GFP_KERNEL); if (!control_u*->host_gpios) { dev_err(&pdev->dev, "unable to alloc memory for host_gpiosn"); ret = -ENOMEM; goto out; } ++/------------------------------我是分割线----------------------------------/ ++//add for 3G_power by jiangdou start ++ power_3g_en = of_get_named_gpio(np, "3G_VCC_33_POWER", 0); ++ if (!gpio_is_valid(power_3g_en)) { ++ dev_err(&pdev->dev, "invalid host gpio%dn", power_3g_en); ++ } else { ++ err = devm_gpio_request(&pdev->dev, power_3g_en, "3G_VCC_33_POWER"); ++ if (err) { ++ dev_err(&pdev->dev, ++ "failed to request GPIO%d for host_drvn", ++ power_3g_en); ++ ret = err; ++ //goto out; ++ } ++ gpio_direction_output(power_3g_en, 1); ++ } ++ ++//add for 3G_power by jiangdou end ++/------------------------------我是分割线----------------------------------*/ gpio = of_get_named_gpio(np, "host_drv_gpio", 0); 3..by jiangdou QQ:344283973

2022-3-10 11:12:59 评论举报涂舒男