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Old 04-30-2014, 09:05 PM   #1
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Can two devices have the same major and minor number?


I have created two devices /dev/rtc0 and /dev/rtc1. Just for fun I let them have the same major AND minor number, and they seem to work fine. As I understand the minor number should be different for two different devices using the same driver. Am I mistaken?

Old 04-30-2014, 09:12 PM   #2
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You're not mistaken but what you may find is that you are only accessing one of the devices not both.
Old 04-30-2014, 09:15 PM   #3
Ser Olmy
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A device node is just a pointer to a kernel resource with a certain major and minor number. The major/minor combination decides which device you end up accessing, not the name of the device node.

You can have any number of device nodes pointing to the same device.


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