[问答]

设备树中的GPIO中断/EXTI如何设置？

问答对人有帮助，内容完整，我也想知道答案 0 我有以下 DTS 文件，但无法使 GPIO 外部中断正常工作。我已阅读有关中断概述的文档，并尝试启用 EXti 以控制 GPIOB 引脚 12。 /dts-v1/; #include "STM32mp157.dtsi" #include "stm32mp15xa.dtsi" #include "stm32mp15-pinctrl.dtsi" #include "stm32mp15xxac-pinctrl.dtsi" #include "stm32mp15xx-dkx.dtsi" / { model = "STMicroelectronics STM32MP157A-DK1 Discovery Board"; compatible = "st,stm32mp157a-dk1", "st,stm32mp157"; chosen { stdout-path = "serial0:115200n8"; }; button { compatible = "test,button"; input-gpios = <&gpiob 12 (GPIO_ACTIVE_LOW \| GPIO_PULL_UP)>; //Works with pull-up once the driver is loaded. interrupts-extended = <&gpiob 12 IRQ_TYPE_EDGE_FALLING>; interrupt-names = "qwerty"; status = "okay"; }; led { extern-led { compatible = "test,led"; gpios = <&gpiob 10 GPIO_ACTIVE_HIGH>; linux,default-trigger = "cpu"; }; }; }; 我遇到的问题是，对于我所有的 gpio_to_irq() 调用，我得到以下信息： [ 64.996864] platformdev: loading out-of-tree module taints kernel. [ 65.003005] mod_probe() function was called. [ 65.006308] mod_probe got miscdev minor id: 125 [ 65.010898] gpio_to_irq(0) = 88 [ 65.015773] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 1 already requested. [ 65.022853] gpio_to_irq(1) = -6 [ 65.025872] gpio_to_irq(2) = 89 [ 65.028910] gpio_to_irq(3) = 90 [ 65.032338] gpio_to_irq(4) = 91 [ 65.035218] gpio_to_irq(5) = 92 [ 65.038271] gpio_to_irq(6) = 93 [ 65.041395] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 7 already requested. [ 65.049669] gpio_to_irq(7) = -6 [ 65.052846] gpio_to_irq(8) = 94 [ 65.055812] gpio_to_irq(9) = 95 [ 65.058943] gpio_to_irq(10) = 96 [ 65.062249] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 11 already requested. [ 65.070436] gpio_to_irq(11) = -6 [ 65.073796] gpio_to_irq(12) = 97 [ 65.076859] gpio_to_irq(13) = 98 [ 65.080112] gpio_to_irq(14) = 99 [ 65.083319] gpio_to_irq(15) = 100 [ 65.086619] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 0 already requested. [ 65.094764] gpio_to_irq(16) = -6 [ 65.098248] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 1 already requested. [ 65.106281] gpio_to_irq(17) = -6 [ 65.109559] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 2 already requested. [ 65.117624] gpio_to_irq(18) = -6 [ 65.120821] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 3 already requested. [ 65.128995] gpio_to_irq(19) = -6 [ 65.132198] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 4 already requested. [ 65.140258] gpio_to_irq(20) = -6 [ 65.143562] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 5 already requested. [ 65.151648] gpio_to_irq(21) = -6 [ 65.154987] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 6 already requested. [ 65.163127] gpio_to_irq(22) = -6 [ 65.166210] gpio_to_irq(23) = 78 [ 65.169463] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 8 already requested. [ 65.177710] gpio_to_irq(24) = -6 [ 65.180905] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 9 already requested. [ 65.189071] gpio_to_irq(25) = -6 [ 65.192273] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 10 already requested. [ 65.200433] gpio_to_irq(26) = -6 [ 65.203808] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 11 already requested. [ 65.212052] gpio_to_irq(27) = -6 [ 65.215234] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 12 already requested. [ 65.223441] gpio_to_irq(28) = -6 [ 65.226725] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 13 already requested. [ 65.235007] gpio_to_irq(29) = -6 [ 65.238204] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 14 already requested. [ 65.246450] gpio_to_irq(30) = -6 [ 65.249632] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 15 already requested. [ 65.258245] gpio_to_irq(31) = -6 [ 65.261203] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 0 already requested. [ 65.269297] gpio_to_irq(32) = -6 [ 65.272615] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 1 already requested. [ 65.280607] gpio_to_irq(33) = -6 [ 65.283951] stm32mp157-pinctrl soc:pin-controller@50002000: irq line 2 already requested. [ 65.292116] gpio_to_irq(34) = -6 当我对 EXTI 引脚 12 输入执行 IRQ 请求时，使用上面提供的 gpio_to_irq 编号（#97），我得到了 IRQ，但它没有触发，因为我相信 EXTI 控制器没有正确监听 GPIOB 引脚 12。我想连接到 gpio 28（GPIOB 引脚 12），但是 GPIOA 引脚 12 已经声明了中断。那么我该如何更改 EXTI 控制器以遵循我在 DTS 文件中定义的内容并改为监听 GPIOB 12 ？我尝试了以下 DTS 编辑：中断扩展 = <&exti 28 IRQ_TYPE_EDGE_FALLING>； ------ 中断扩展 = <&gpiob 12 IRQ_TYPE_EDGE_FALLING>； ------ 中断父母= <&gpiob>; 中断 = <12 IRQ_TYPE_EDGE_FALLING>； ------ 如果有人能解释我的 DTS 文件应该读取什么，我将不胜感激。编辑：我暂时将输入按钮连接到 GPIO A12 引脚，linux 中断按预期工作，那么是什么配置错误导致 EXTI 未连接到 GPIO 端口 B？我不能使用 pin A12，我更想了解这个外围设备是如何配置的。 0
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答案对人有帮助，有参考价值 0 我已经解决了这个问题，而且它相当微妙。我的代码从 0-100 遍历所有 GPIO，我正在寻找 IRQ 号的变化以指示可以使用 IRQ。然而，这些似乎都没有必要。当您的驱动程序被探测时，当使用 gpiod_to_irq 请求引脚时，EXTI 接口将第一个请求的存储体上的第一个引脚分配给 EXTI 接口。因此，通过将我的迭代次数从 0-100 更改为 16-32，我所有的中断现在都在端口 B 上。例如，如果我想要一个按钮的 GPIO B12，我可以调用 gpiod_to_irq(28)，连续调用以下任何一个将返回 -6（已请求 irq）： gpiod_to_irq(12) // GPIO A12 gpiod_to_irq(44) // GPIO C12 gpiod_to_irq(60) // GPIO D12 ... 我不确定这是否可以更改。例如，如果我想在操作期间更改它，我是否必须请求 IRQ，然后在为不同的银行再次调用 gpiod_to_irq 之前释放 IRQ？如果我发现，我会更新。

2023-2-1 15:18:48 评论举报陈萍