ktypes vs. devices classes (struct class)

Richard <[email protected]>
Newsgroups gmane.linux.kernel.kernelnewbies
Message-ID <[email protected]> 
Hi all,

Why do we have ktypes (struct kobj_type) AND device classes (struct class)?

Don't they serve the same purpose (more or less) and it would be 
simpler, clearer and more KISS to only have one? Is this a historically 
grown thing or by design?

Thanks,
-- Richard
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