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内核空间GPIO问题-am335x



请教一个问题。我要做内核模块中操作gpio。我配置了pinmux_config,驱动里申请了gpio_request,但在内核空间操作gpio无反应,也没报错。在用户空间,即/sys/class/gpio中操作是正常的。这个问题出在哪里?我少了什么环节吗?还是哪里的问题?