PROCESSOR-SDK-AM62X: 6254的MCU_GPIO组的引脚，怎么在ARM核上调用

我想在现有的led设备树上，添加一个mcu的引脚

usr_led_pins_default: usr-led-pins-default {pinctrl-single,pins = <AM62X_IOPAD(0x0ac, PIN_OUTPUT, 7) /* (L21) GPMC0_CSn1.GPIO0_42 */AM62X_IOPAD(0x1b8, PIN_OUTPUT, 7) /* (C13) SPI0_CS1.GPIO1_16 */AM62X_IOPAD(0x1bc, PIN_OUTPUT, 7) /* (A14) SPI0_CLK.GPIO1_17*/AM62X_IOPAD(0x1c0, PIN_OUTPUT, 7) /* (B13) SPI0_D0.GPIO1_18 */AM62X_IOPAD(0x1c4, PIN_OUTPUT, 7) /* (B14) SPI0_D1.GPIO1_19 */AM62X_IOPAD(0x078, PIN_OUTPUT, 7) /* (B14) SPI0_D1.GPIO1_19 */AM62X_MCU_IOPAD(0x004,PIN_OUTPUT, 7)>;};

这么修改后连前面几个A核的gpio都不能生成节点了；

我又尝试只配置成gpio模式；

然后在/sys/查看gpio的使用情况

root@ok6254:~# cat /sys/kernel/debug/gpio 

gpiochip2: GPIOs 314-401, parent: platform/601000.gpio, 601000.gpio:gpio-330 (|led1) out logpio-331 (|led2) out logpio-332 (|led3) out logpio-333 (|led4) out logpio-336 (|fixed-regulator-rgb ) out lo

gpiochip1: GPIOs 402-488, parent: platform/600000.gpio, 600000.gpio:gpio-433 (|net-5g-rst) out lo ACTIVE LOWgpio-437 (|phy_rstn) out logpio-438 (|id) in  logpio-440 (|RT9186) out logpio-441 (|fixed-regulator-lvds) out logpio-442 (|phy_rstn) out logpio-444 (|heartbeat) out logpio-473 (|regulator-6) out lo

gpiochip0: GPIOs 489-511, parent: platform/4201000.gpio, 4201000.gpio:

root@ok6254:~# 

关于gpiochip的计算公式

例如Gpmc_ad15的引脚是gpio0_30,chip值为402+30=432

导出gpio

root@ok6254:~# echo 432 >/sys/class/gpio/export

设置方向

root@ok6254:~# echo out >/sys/class/gpio/gpio432/direction

设置高低电平

root@ok6254:~# echo 1 >/sys/class/gpio/gpio432/value  置高

root@ok6254:~# echo 0 >/sys/class/gpio/gpio432/value   拉低

但是关于mcu的gpio

引脚的chip号我一直不知道怎么算，是489+n吗，我这边一直控制不了，请问你那边这么测试过有问题吗？MCU的gpio该怎么在a核使用

Shine：

我把您的问题升级到了英文e2e论坛，请关注下面帖子的回复。https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1130726/am625-how-to-use-mcu-gpio-on-a-core

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Shine：

请参考下面工程师的回复。

I am not sure what do you mean, what are you looking for?

What does the command "ls /sys/class/gpio/" show?

Please also note that the MCU GPIO pinmux should be added in in &mcu_pmx0 node, not &main_pmx0 node.

This is what Sysconfig generated for MCU_GPIO1, just copy it over to your board DTS file.

&mcu_pmx0 { mymcugpio1_pins_default: mymcugpio1-pins-default { pinctrl-single,pins = < AM62X_MCU_IOPAD(0x0004, PIN_INPUT, 7) /* (B8) MCU_SPI0_CS1.MCU_GPIO0_1 */ >; }; };

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user6044729：

参考链接后，问题解决，非常感谢

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Shine：

不客气~ 感谢分享!